Joe Philley - G+ Profile Archive

Cryptanalysis of transposition ciphers   #ingress   #nianticproject   Originally shared by Verum Inveniri Transposition (part 3) Cryptanalysis of transposition ciphers How can you get a handle on a transposition cipher? The first thing to remember, is all the characters are still there. We have an anagram! And you can use an anagram solver to find possible words hidden in the ciphertext. Once you have a word that you think is in there somewhere, you can look at the positions of the letters and hopefully spot the pattern that allows you to shuffle all the characters back to their correct positions. The NIA often break one of the critical rules in cryptography, and leave clues about the key right next to the puzzle. This can make your task much easier, for example, if you know that 4 is the clue, then you might find that the cipher is railfence with 4 rails. When you solve the example, don’t give the answer to anyone else! Share this post with your friends instead. If you need help wit...

Verum Inveniri is back with part 2 of the code class for those who want to see how its done. #nianticproject   #ingress   Originally shared by Verum Inveniri Transposition (part 2) How many different ways can you shuffle letters? Lots, as it turns out! Here is a partial list of methods you might want to keep in mind: Reversal - This one’s easy, and can usually be spotted visually. Railfence - We looked at this in the previous post. Boustrophedon - A fancy word for a writing system that reads left-to-right on the first line, and right-to-left on the next, and so on. The letters form a continuous snake down the page. Transpose rows and columns - This can be as simple as reading rows as columns, or may be combined with other methods. If the number of characters doesn’t make a neat block, you can pad it to fit. Spiral - Round and round... Skip - Start with the first character, then skip over one (or more) characters, and continue, looping around to the beginning when you reach the end....

Originally shared by Verum Inveniri Transposition (part 1) A transposition cipher is a cipher that works by simply shuffling the letters of the message around. If you do this at random, you end up with an anagram . However, if you want to reliably decode messages, you need to shuffle the letters in an ordered fashion. A simple way to do this is to write out your message in rows then read it out in columns.  One favourite of the NIA is a more complex method called railfence . Write out the message in a zig-zag pattern, then read it out in rows. These ciphers are very easy to solve with pen and paper. When you solve the example, don’t give the answer to anyone else! Share this post with your friends instead. If you need help with cryptography, come to #veruminveniri on irchighway.net to talk. http://irc.lc/irchighway/veruminveniri/VI@@@ #ingress #cryptography

Seem the Verum Inveniri  has a new message for us. #nianticproject   #ingress   Originally shared by Verum Inveniri Steganography Steganography is the art of hiding messages to keep them secret. One surprisingly effective technique used by the NIA is to hide messages in images using very low contrast. Sometimes these are visible to the naked eye, sometimes not. You can see the message for yourself by increasing the contrast and moving the brightness up or down. Use your favourite image manipulation program to do this. Try it out on the image below... #ingress #cryptography