Geeks for Privacy: Play Color Cipher and Visual Cryptography

Maybe the guys in Anonymous or Wikileaks can now use visual cryptography while using Snapchat to fool the NSA or CIA

Personally I think a browser with inbuilt backdoors to Tor Relays and data transfer by Bit Torrrents could be worthy a project too.

Quit the bullshit, Google- you are as evil as The Russian Communist Empire

I was just reading up on my weekly to-read list and came across this interesting method. It is called Play Color Cipher-

Each Character ( Capital, Small letters, Numbers (0-9), Symbols on the keyboard ) in the plain text is substituted with a color block from the available 18 Decillions of colors in the world [11][12][13] and at the receiving end the cipher text block (in color) is decrypted in to plain text block. It overcomes the problems like “Meet in the middle attack, Birthday attack and Brute force attacks [1]”.
It also reduces the size of the plain text when it is encrypted in to cipher text by 4 times, with out any loss of content. Cipher text occupies very less buffer space; hence transmitting through channel is very fast. With this the transportation cost through channel comes down.



Visual Cryptography is indeed an interesting topic-

Visual cryptography, an emerging cryptography technology, uses the characteristics of human vision to decrypt encrypted
images. It needs neither cryptography knowledge nor complex computation. For security concerns, it also ensures that hackers
cannot perceive any clues about a secret image from individual cover images. Since Naor and Shamir proposed the basic
model of visual cryptography, researchers have published many related studies.


Visual cryptography (VC) schemes hide the secret image into two or more images which are called
shares. The secret image can be recovered simply by stacking the shares together without any complex
computation involved. The shares are very safe because separately they reveal nothing about the secret image.

Visual Cryptography provides one of the secure ways to transfer images on the Internet. The advantage
of visual cryptography is that it exploits human eyes to decrypt secret images .



Even more fun—– visual cryptography using a series of bar codes – leaving the man in middle guessing how many sub images are there and which if at all is the real message




Color Visual Cryptography Scheme Using Meaningful Shares

Visual cryptography for color images

Other Resources

  2. Visual Crypto – One-time Image Create two secure images from one by Robert Hansen
  3. Visual Crypto Java Applet at the University of Regensburg
  4. Visual Cryptography Kit Software to create image layers
  5. On-line Visual Crypto Applet by Leemon Baird
  6. Extended Visual Cryptography (pdf) by Mizuho Nakajima and Yasushi Yamaguchi
  7. Visual Cryptography Paper by Moni Noar and Adi Shamir
  8. Visual Crypto Talk (pdf) by Frederik Vercauteren ESAT Leuven
  10. t the University of Salerno web page on visual cryptogrpahy.
  11. Visual Crypto Page by Doug Stinson
  12. Simple implementation of the visual cryptography scheme based on Moni Naor and Adi Shamir, Visual Cryptography, EUROCRYPT 1994, pp1–12. This technique allows visual information like pictures to be encrypted so that decryption can be done visually.The code outputs two files. Try printing them on two separate transparencies and putting them one on top of the other to see the hidden message.

Visual Cryptography 

Ajay- I think a combination of sharing and color ciphers would prove more helpful to secure Internet Communication than existing algorithms. It also levels the playing field from computationally rich players to creative coders.

R in Oracle Java Cloud and Existing R – Java Integration #rstats

So I finally got my test plan accepted for a 1 month trial to the Oracle Public Cloud at .

oc1 I am testing this for my next book R for Cloud Computing ( I have already covered Windows Azure, Amazon AWS, and in the middle of testing Google Compute).

Some initial thoughts- this Java cloud seemed more suitable for web apps, than for data science ( but I have to spend much more time on this).

I really liked the help and documentation and tutorials, Oracle has invested a lot in it to make it friendly to enterprise users.

Hopefully the Oracle R Enterprise  ORE guys can talk to the Oracle Cloud department and get some common use case projects going.


In the meantime, I did a roundup on all R -Java projects.

They include-

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How to be a Happy Hacker

I write on and off on hackers (see and even some poetry on them ( . During meetups, conferences, online discussions I run into them, I have interviewed them , and I have trained some of them (in analytics). Based on this decade long experience of observing hackers, and two decade long experience of hanging out with them- some thoughts on making you a better hacker, and a happier hacker even if you are a hacker activist or a hacker in enterprise software.

1) Everybody can be a hacker, but you need to know the basic attitude first.  Not every Python or Java coder is a hacker. Coding is not hacking. More details here-

2) Use tools like Coursera, Udacity, Codeacdemy to learn new languages. Even if you dont have the natural gift for memorizing syntax, some of it helps. (I forget syntax quite often. I google)

3) Learn tools like Metasploit if you want to learn the lucrative and romantic art of exploits hacking ( The demand for information security is going to be huge. hackers with jobs are happy hackers.

4) Develop a serious downtime hobby.

Lets face it- your body was not designed to sit in front of a computer for 8 hours. But being a hacker will mean that commitment and maybe more.

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