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Tuesday, September 28, 2021

Full expanded form of IOTA blockchain?

 Well.... I always used to look for the expanded form of IOTA blockchain but could never get the answer. But today I got the same finally vide a chat as produced below:

" it's not an acronym, but it stands for the smallest unit possible in the greek alphabet, as with IOTA also micropayments are possible, e.g. 0.000001 cent. IOTA is engineered completely different than a traditional blockchain, but the IOTA Foundation is one of the leading orgs for DLT research globally, pioneering the DAG (directed acyclic graph) since 2016. The DAG enables parallel access to the DLT. IOTA is designing a green, secure, feeless and highly scalable DLT, without the negative "issues" of blockchain. This also makes it very suitable for data-driven scenarios like DID. Organizations also do not need to buy/hold cryptocurrency"

Thanks Holger Kother...

Saturday, September 11, 2021

RTL8761B Tobo Mini USB Bluetooth Adapter installation on UBUNTU 20.04

No intro...no discussion....no details....will come direct to the problem and then the solution. :-)


QUERY / PROBLEM: You planning to buy a Bluetooth adapter for your Linux Operating system and are pondering to buy the right one to avoid any driver or installation issues later. Since window OS users have default drivers but not so with most of devices for Linux. So since I recently bought one Tobo Mini USB Bluetooth 5.0 Adapter Wireless Bluetooth Dongle Receiver, I had to search for solutions for smooth installation. So just few lines of code to be run on the terminal and you will be good to go...the drivers for the same are available at the link https://drive.google.com/drive/folders/1-6NI2-PMbX1wmVb1FYbXblaPvZGdKElD 

Once you access this folder you will find the files as seen in pic below:

Download the Linux folder and you will see some thing like below pic


now goto the terminal inside the usb directory and run this command

sudo make install INTERFACE=all

after this command ,next  move to the /home/ur_username/Downloads/rtl8761b/rtkbt-firmware/lib/firmware and run these two commands

sudo cp rtl8761bu_fw /lib/firmware/

sudo cp rtl8761bu_config /lib/firmware/

and that's all...init 6 and checkout...bluetooth will be seen...best wishes.

Tuesday, August 03, 2021

Byzantine General - Proof of Work consensus and Mining in Bitcoin Blockchain

Analogical to a Byzantine general scenario wherein a number of armies intending to attack an enemy fort need to reach a consensus of day/time to attack, this video explains how Bitcoin nodes attain consensus vide the Proof-of-work method on the same lines. This video builds up from brief history from David Chaum and Adam Bach works onwards to Wei Dai works on Blind signatures, Hash Cash and Proof-of-Work to understand concept of nonce and consensus mechanism in a Bitcoin Blockchain. Further this video brings out the reward mechanics in the Bitcoin eco-system and also Mining methods and types



Monday, August 02, 2021

Hashes & Merkle Trees in Blockchain Mechanics


Hash Functions take input of any length and produce a fixed-length string which means that one can use hashes on something as small as a few characters or as large as an entire document or even files of huge sizes in GBs and above. 

On the other hand enabled by these hash functions, Merkle tree represent hash-based data structure that is a generalization of the hash list and represent structure in which each leaf node is a hash of a block of data, and each non-leaf node is a hash of its children. Both Hash functions and Merkle Trees are cardinal to the mechanics of any Blockchain. 

This video focuses on a simple explanation of understanding Hashes and Merkle Trees. Hash functions SHA-256 and RIPEMD-160 have been discussed in little detail being peculiar to Bitcoin blockchain.

Thursday, July 29, 2021

Distributed Ledger Technology in BLOCKCHAIN - Simple explanation

This video post brings out what DLT i.e. Distributed ledger technology is all about and what is it's contribution to blockchain.



Technology amalgamations inside Blockchain

Blockchain is an amalgamation of multiple technologies which have existed already in the IT ecosystem for last few decades. These include majorly cryptography, private-public keys, hashes, proof-of-work and other important technologies. This video post only identifies by name of what major technologies any blockchain is enabled on.



Where to start the "Learning BLOCKCHAIN" journey ?

Related to my earlier post https://anupriti.blogspot.com/2021/05/i-want-to-learn-blockchain-but-where-do.html this post focuses on the same presentation in a video talk version....



Wednesday, July 28, 2021

Recent Advances and Trends in Lightweight Cryptography for IoT Security and Blockchain Technologies at RGPV Bhopal 27th July 2021

An FDP was held peculiar to domain of  Lightweight Cryptography for IoT Security and Blockchain Technologies at RGPV Bhopal on 27th July 2021.The objective of this FDP was to bring together faculties, researchers, PG and UG students from across the country to learn about security challenges in Modern Cryptography, Blockchain & IoT. FDP aimed to demonstrate security challenges that Modern Cryptography, Blockchain, IoT systems pose, demands users to select a reliable and compatible architecture according to the business requirements to ensure secure flow of data and communication and also define the solution and future prospects related to these challenges. I gave a small 2 hour talk on the same which is available at the youtube link below

 CLICK ON THE IMAGE BELOW TO BE REDIRECTED TO THE YOUTUBE LINK



WHAT BLOCKCHAIN SIMPLY MEANS : A Short attempt

A short simple video to represent the mechanics of blockchain and ends with mentions of technologies running a Blockchain.
 

National E-Conference on Regulation of Crypto-currency in India - 24 July 2021 at NLIU Bhopal

National E-Conference on Regulation of Crypto-currency in India was held on 24 July 2021. The themes covered in the conference are seen in the below pic:

I was part of the valedictory session of this conference, invited as a chief guest in the evening concluding session. More details of the same available at https://www.barandbench.com/apprentice-lawyer/first-national-e-conference-on-regulation-of-cryptocurrency-in-india-by-rgnclc-nliu-bhopal

Monday, July 05, 2021

Cryptocurrency Technology Foundations and Crimes Investigations

 To fight against the rising challenges of Cyber Crimes, the Gurugram Police in association with Society for Safe Gurgaon, Indo-Israeli cyber security enterprise and SafeHouse Technologies organised the 9th edition of Gurugram Police Internship (GPCSSI 2021) under the mentorship of ACP Cyber crime Karan Goel and the entire Gurugram police cyber crime team in coordination with Rakshit Tandon Advisor Cyber Peace foundation. This presentation talk on cryptocurrency technology and crimes investigation was taken by Anupam Tiwari on 05th July 2021. Sharing for info of interested in domain.

Cryptocurrency Technology F... by Anupam Tiwari

Tuesday, June 08, 2021

MERGING PDF: UBUNTU 20.04 LTS

This small post shares a one line command in Ubuntu terminal to merge to PDFs. While for the regulars,merging the same online would seem to be the quickest and the best but there are times when you wish your PDFs are not compromised by third party websites offering these mergers for free...so why not use a one line command with the help of a tool pdftk.

The command to install the same is 

sudo apt-get install pdftk

and the command thereafter to merger the PDFs like three files 1.pdf, 2.pdf and 3.pdf is as seen below:

 pdftk 1.pdf 2.pdf 3.pdf cat output 4.pdf

where 4.pdf is the merged final output file.

That's all...no third party website reliance for private files.

Monday, May 03, 2021

TALLINN MANUAL & GLOBAL ATTEMPTS IN CYBER WARFARE POLICIES

The presentation is one unique presentation peculiar to TALLINN MANUAL version 1.0 and 2.0. Along with is discussed cyber policy attempts of other countries.The Tallinn Manual has long been the flagship research initiative of the NATO CCDCOE. The original Tallinn Manual (published in 2013 by Cambridge University Press) addressed the most severe cyber operations followed by version 2.0. The presentation cover the origin details of why this manual arrived at the global scene and what followed around at the global attempts for framing the global cyber policy.


Saturday, May 01, 2021

I want to learn Blockchain, but where do I start from? : Here is My Answer.

I am writing this one exclusive post for guys who just wish to begin their journey in the domain of Blockchain. "Blockchain" term has been buzzing across academia, universities, corporate industries and every where around. In most of the webinars I speak in, I find many inquisitive learners willing to jump in the domain but unable to find that exclusive blockchain sea where to dive in. And if ever they try diving in, the sheer amount of books, videos and sea of information existing on the internet just splashes their visions soon to drown. Herewith I am sharing few slides that are based on my journey in this domain for now over 5 years. The presentation brings out details of topics one should start exploring and dig in followed by few books that I have in person followed and imbibed from.

How to Start Learning BLOCK... by Anupam Tiwari

Wednesday, April 28, 2021

Technology Internals behind Blockchain Technology

I have erstwhile shared and uploaded a number of presentations on Blockchain technology and crypto crimes though. This presentation solely focuses on internals of blockchain technology and has additional details starting from scratch for newbies to develop an initial understanding of this awesome technology. Anyone with any clarifications on any slide may contact back at the email mentioned at end of the presentation. Also sharing a picture of my books peculiar to my blockchain exploring interest

Technology Internals behind Blockchain Technology by Anupam Tiwari on Scribd

Tuesday, April 27, 2021

Blockchain Forensics & Cryptocurrencies : NFSU FDP 09 April 2021

The School of Cyber Security and Digital Forensics, National Forensic Sciences University, Gandhinagar organised a 5 day online Faculty Development Program (FDP) on 'Advanced Trends in Digital Forensics' from 05 Apr-09 Apr 2021.The aim of this FDP was to promote research and strengthen the Digital Forensic Investigation Techniques which include topics like crime investigation, latest trends in Digital Forensics, Fake News Detection, and Drone & Crypto Forensics. I was a invited speaker here and am sharing my presentation deck here on blockchain and cryptocurrency forensics.

 



 

Cryptocurrency Forensics and Blockchain Technology by Anupam Tiwari on Scribd

Saturday, February 06, 2021

BRAVE Web Browser : How much advertisements I blocked in a week ?

Hello friends, herewith first I am sharing screen shots of my brave browser dashboard that I captured over a week from 30 Jan 2021 to 6 Feb 2021.The screen shots I have taken pertain to morning hours whenever I login for the day. I am generally on my PC for about 8-9 hours a day. I majorly watch YouTube videos and surf across multiple sites in a day that range from 50-100 at times. So what I am bringing out here that how many ads Brave browser has blocked in this duration and whilst this surfing times.

30 Jan 2021 : 70517 blocked : Counter 0

 31 Jan 2021 : 77744 blocked : Counter 7227  in day( i.e. 30 Jan 2021)

01 Feb 2021 : 92342 blocked : Counter 14598  in day( i.e. 31 Jan 2021)

02 Feb 2021 : 97440 blocked : Counter 5098  in day( i.e. 01 Feb 2021)

03 Feb 2021 : 105386 blocked : Counter 7946  in day( i.e. 02 Feb 2021)

04 Feb 2021 : 108354 blocked : Counter 2968  in day( i.e. 03 Feb 2021)

05 Feb 2021 : 112036 blocked : Counter 3682  in day( i.e. 04 Feb 2021)

06 Feb 2021 : 114870 blocked : Counter 2834  in day( i.e. 05 Feb 2021)


So,total ads blocked over a week is 44353 that deduces to approx average of 6336 ads/day. That's phenomenal to say. Each of these trackers would be definitely linked to thousands of other trackers also giving them unrestricted access to all the user behavior ,privacy and profiles. While there is not much a normal user can do about these trackers, I feel just blocking these thousands of ads will not make any one absolutely free of tracking,but still better than surfing without blockers. Because if the ad companies know that users are blocking by means of plugins and such browsers,they would have already found ways to still track you. After all that's their means of living and minting economy.

Sunday, January 31, 2021

REMOVE METADATA FROM IMAGES: UBUNTU with exiftool utility

Just few commands in Ubuntu to check the meta data and thereafter remove the same.I am using a utility exiftool which does not come inbuilt to most of the Linux systems,but we need to install them.

INSTALL COMMAND

sudo apt-get install libimage-exiftool-perl

USAGE COMMAND

exiftool -all= IMG_20200504_215424.jpg

(The above command creates a separate copy of the original file and the new file which is created with removed metadata)

or

exiftool -overwrite_original -all= IMG_20200504_215424.jpg 

(The above command overwrites the original file with the new file created with removed metadata)

Showing you output of one file prior to removal of meta data and thereafter removing the meta data

ORIGINAL FILE

kabali@Kabali:~/Desktop/ddd$ jhead IMG_20200504_215424.jpg
File name    : IMG_20200504_215424.jpg
File size    : 3588382 bytes
File date    : 2021:01:31 14:10:13
Camera make  : Xiaomi
Camera model : Mi A2
Date/Time    : 2020:05:04 21:54:24
Resolution   : 4000 x 3000
Orientation  : rotate 90
Flash used   : No
Focal length :  4.1mm  (35mm equivalent: 4mm)
Exposure time: 0.050 s  (1/20)
Aperture     : f/1.8
ISO equiv.   : 1000
Whitebalance : Auto
Metering Mode: center weight
GPS Latitude : ? ?
GPS Longitude: ? ?
JPEG Quality : 98

REMOVED METADATA FILE

kabali@Kabali:~/Desktop/ddd$ jhead IMG_20200504_215424.jpg

File name    : IMG_20200504_215424.jpg
File size    : 3556853 bytes
File date    : 2021:01:31 14:30:08
Resolution   : 4000 x 3000
JPEG Quality : 98


 

Friday, January 29, 2021

REMOVING META DATA FROM VIDEO FILES : UBUNTU TERMINAL COMMANDS

Hello everyone, this post focuses on removing metadata from a video file using ffmpeg inbuilt utility in Ubuntu OS. The following command includes the original file MAH08207.mp4 being stripped of metadata and being output into a new file as output.mp4.

ffmpeg -i MAH08207.mp4 -map 0 -map_metadata -1 -c copy output.mp4

The output of the command is as below:

ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MAH08207.mp4':
  Metadata:
    major_brand     : MSNV
    minor_version   : 22675568
    compatible_brands: MSNVmp42isom
    creation_time   : 2020-11-09T00:48:18.000000Z
  Duration: 00:00:44.16, start: 0.000000, bitrate: 12146 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4), 1440x1080 [SAR 4:3 DAR 16:9], 12016 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2020-11-09T00:48:18.000000Z
      handler_name    : Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2020-11-09T00:48:18.000000Z
      handler_name    : Sound Media Handler
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4), 1440x1080 [SAR 4:3 DAR 16:9], q=2-31, 12016 kb/s, 25 fps, 25 tbr, 25k tbn, 25k tbc (default)
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 1104 fps=0.0 q=-1.0 Lsize=   65489kB time=00:00:44.13 bitrate=12154.5kbits/s speed= 540x    
video:64774kB audio:688kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.039428%

The size of the original file and the stripped of file is

-rw-r--r-- 1 kabali kabali 67050400 Nov  9 06:19 MAH08207.mp4
-rw-rw-r-- 1 kabali kabali 67060450 Jan 29 20:23 output.mp4 

Thus difference between the files is the meta data removed.

I am also showing the output of ffprobe utility run on the two files to show you the difference of meta data removed too.

ffprobe MAH08207.mp4

 ffprobe version 4.2.4-1ubuntu0.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MAH08207.mp4':
  Metadata:
    major_brand     : MSNV
    minor_version   : 22675568
    compatible_brands: MSNVmp42isom
    creation_time   : 2020-11-09T00:48:18.000000Z
  Duration: 00:00:44.16, start: 0.000000, bitrate: 12146 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4), 1440x1080 [SAR 4:3 DAR 16:9], 12016 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2020-11-09T00:48:18.000000Z
      handler_name    : Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2020-11-09T00:48:18.000000Z
      handler_name    : Sound Media Handler


ffprobe output.mp4 

 ffprobe version 4.2.4-1ubuntu0.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:44.16, start: 0.000000, bitrate: 12148 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4), 1440x1080 [SAR 4:3 DAR 16:9], 12016 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

SPLIT VIDEOS IN UBUNTU: SINGLE LINE COMMAND{ffmpeg utility}

Sharing here just a single line command of ffmpeg utility which can split a video with time duration's specified.So if your video is suppose 05:03(min:sec) long and you wanna split it into two sizes with part 1 as 00:00 to 02:28 and the other part 2 as 02:28 to 05:03,the commands to be executed will be

ffmpeg -i VID_20210129_115611.mp4 -ss 00:00:00 -t 00:02:28 part1.mp4

ffmpeg -i VID_20210129_115611.mp4 -ss 00:02:28 -t 00:05:03 part2.mp4

where VID_20210129_115611.mp4 is the main file and part1.mp4/part2.mp4 are the respective output files.


Thursday, January 28, 2021

MERGE VIDEOs IN UBUNTU: TWO TERMINAL COMMANDS

Hi guys...no time waste here...I m mentioning two commands to simply merge your multiple videos quickly in an Ubuntu OS.No GUI or other applications to download or use. The ffmpeg command inbuilt to Ubuntu easily merges without hassles.

So,the first command is 

find "$(pwd)" -type f -name '*.mp4' -printf "file '%p'\n" | tee mp4_compile.txt

The above command will simply find your all mp4 files in the directory wherein you run this command in the terminal directory and compile them into one text file. This text file is named here as mp4_compile.txt. You can name it any thing.

The second command is as given below:

ffmpeg -f concat -safe 0 -i mp4_compile.txt -c copy merged.mp4

This command will merge all the files compiled in the txt file and merge into one output file names as merged.mp4

Thats all...I actually went through a lot of softwares and applications...tried online merge too but all had some kind of limitation in size...till I found these commands.So happy sharing and happy merging.

NOTHING BLOCKCHAIN ABOUT IT :-)

Wednesday, January 20, 2021

Ubuntu 20.04 LTS brightness control with command line[SOLVED]

While I moved my kernel face from 18.04  to 20.04 LTS,there were few irritants while I got adapted to new interface and features…and one of them was the missing brightness tab in Ubuntu 20.04 LTS. Don’t know why it was removed,but then may be a small community used it and so was discontinued. So I tried third party plugins, few new brightness apps also tried brightness controller but somehow was not happy with the desired screen brightness control.Though Ubuntu 20.04 has night light feature wherein you can tweak with color temperatures from  less warm to more warm but that too fall short of my requirement. So I just wanted a clean hassle free solution. So I got to know about the xrandr command. Xrandr is used to set the size, orientation and/or  reflection  of  the outputs for a screen. It can also set the screen size. 

The good thing is that this utility comes pre-installed with the OS. You just need to use it vide few command line inputs and these are as below:

The first command is

xrandr | grep " connected" | cut -f1 -d " "


This command basically gives you an output of the name of your monitor. In my case it gives HDMI-0.
 
After this command you need to use the same command with different switch and adjusting the brightness to suit your eyes. While 1 refers to highest brightness 0.1 refers to the lowest.So in bright rooms if you wish to set like me,I generally prefer 0.7.The command line goes like this:

 xrandr --output HDMI-0 --brightness 0.7

Other functions that this utility can assist you are with setting resolution and refresh rates. The command lines are mentioned below:

 

SETTING RESOLUTION

xrandr --output HDMI-0--mode 1680x1050

SCREEN REFRESH RATE

xrandr --output HDMI-0--mode 1680x1050 --rate 60.00

Another switch –q will query your monitors and give details as seen below


 Just remember to change your screen name as per your monitor name...in my case like I said...it is HDMI-0.

Thursday, January 14, 2021

CQ 100: Meet India’s Most Influential Cyber Warriors

First post in this year...though little delayed comes as a pleasant surprise from the cyberosphere.....Sharing here the link of a post that has identified India’s most influential cyber warriors  and has listed me too....

https://www.the420.in/cq-100-meet-indias-most-influential-cyber-warriors-top-cyber-experts/

Screenshot as below:

Thursday, December 17, 2020

IIIT Dharwad FDP on Blockchain Technology: 04 Nov 2020

IIIT Dharwad conducted an FDP on blockchain under aegis of AICTE on 04 Nov 2020.I am sharing here webinar recording and the presentation of my sessions.

Blockchain Technology FDP at IIIT Dharwad by Anupam Tiwari on Scribd

Sunday, October 18, 2020

CYBER SECURITY : A Mathematical attempt to understand and interpret the mechanics behind

Well..after a long time of around few years I gave a talk that was exclusive to CYBER SECURITY otherwise I have generally hovered around Blockchain and bitcoin for quiet some time now.The unique thing about this presentation is the take on that I attempted. The difference between the usual presentations and this one is that I have tried to explain the technicals behind data collection and prediction through regression. While the common men isn't largely bothered about surfing anything, anywhere, anytime, believing what harm can one do if he has nothing to loose. But alas he should understand why is the need so.The strange patents that IT giants like facebook ,google ,MIcrosoft are currently holding and developing is worrisome to realise. The links below give the presenation download google drive link and the scribd direct link.

Google drive link at :

 https://drive.google.com/file/d/1zwo88ljDaJxJ8S7obKXkICtGDUGGVHZx/view?usp=sharing


Cyber Security : An attempt... by Anupam Tiwari

Workshop on Blockchain Technology and e-Governance: GNLU Center for Law and Technology

A one day Workshop on Blockchain Technology and e-Governance was organized by GNLU,Ahmedabad University through its GNLU Center for Law and Technology in collaboration with Gujarat Council on Science and Technology &  Department of Science and Technology, Government of Gujarat on 19 Sept 2020. The webinar link for the same is as below:

The presentation is available for download at the following link:

https://drive.google.com/file/d/1RT79-r5LhFXdbi2D_ZKgkwu8eH9v5225/view?usp=sharing

while also the scribd direct link for viewing is available as below:


Blockchain Technology and e-Governance by Anupam Tiwari on Scribd

Summer Internship Gurugram Police : Talk on Blockchain basics and Bitcoin crimes

Blockchain basics: Mechanic... by Anupam Tiwari

 

Sharing here a webinar presentation I gave in the Gurugram police summer internship on 27 June 2020.The webinar was attended by 400 plus participants. The link to the presentation pdf is given below:

https://drive.google.com/file/d/1K13ljAstX4oCqd4iMtGROqseyMJ8Rp8R/view?usp=sharing

and the certificate I got as below:



Monday, October 05, 2020

Blockchain and Bitcoin: Overview and Internal mechanics




A webinar was conducted on Blockchain and Cybersecurity connects on 26 Aug 2020 for Aurobindo Institute of Technology.  The webinar primed upon the basics of what blockchain technology is and how it works in the backend. For better assimlation,it was assisted with due simulations.The link is shared above for readers info. The link for the presentation is as below:

https://drive.google.com/file/d/1_IrnZBrI85jH5B2vSkDmgO-YAAbmzd5B/view?usp=sharing


 

Saturday, July 18, 2020

Blockchain mechanics and Internals:Webinar link and presentation



A webinar was held on the topic "Blockchain mechanics and Internals" coordinated by Govt Women Polytechnic College,Bhopal on 13th June 2020.The video link is shared above and the presentation link is shared below:


Saturday, May 02, 2020

Installation Bitcoin core on UBuntu 18.0.4 LTS : Bitcoin Mechanics -1

With this first post special to Bitcoin core,over next few months I intend to do some exploring on the bitcoin mechanics part.This basically means playing with the blocks and blockchain vide few python based scripts.Will start from the installation part followed by other posts on extracting info from bitcoin blockchain. This post basically is straight forward installation with the following commands.Screen shots for info :

Firstly install snapd with the following commands

sudo apt update
sudo apt install snapd

 
 click green button install

after this installation of snapd,one single command as follows:

sudo snap install bitcoin-core

The effected screenshots are seen below :


Once installed ,you can check on the terminal...should see three bitcoin applications by tabbing


While the GUI shows as below


When you run for the first time,the GUI notification pops for asking for location of default directory for storing blocks.


Thereafter the blocks start getting downloaded with status of files downloaded visible....


Blocks downloaded status is seen below...this downloading around 287 GB as on date will take time as per download speed available.


The location of the blocks being downloaded will be at /home/bitcoin_scripts/snap/bitcoin-core/common/.bitcoin/blocks where bitcoin_scripts is the user name.

Next post we will see whats inside the block....

Thursday, April 30, 2020

How to Install Microsoft office 2007 on Ubuntu 18.04 LTS ?

This post will bring out steps on how to install Microsoft office 2007 or any version upto Office 2016 on a Ubuntu 18.04 LTS. Few of the commands one will require are given below followed by the screenshots of installation steps :

Installing XTERM

sudo apt-get update -y

sudo apt-get install -y xterm


Installing PlayOnLinux which relies on the WINEHQ Project

wget -q "http://deb.playonlinux.com/public.gpg" -O- | apt-key add -

wget http://deb.playonlinux.com/playonlinux_stretch.list -O /etc/apt/sources.list.d/playonlinux.list

sudo apt-get update

sudo apt-get install playonlinux


The related screen shots are enclosed below for reference :

Installing playonlinux...terminal shots































Here we see the Microsoft office 2007 running....

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