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[ Cipher Classics ]
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| Submitted on: |
2/17/2005 4:19:44 PM |
| By: |
D. Rijmenants
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| Level: |
Beginner |
| User Rating: |
By 6 Users |
| Compatibility: |
VB 5.0, VB 6.0 |
| Views: |
31383 |
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(About the author) |
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Encryption with a list of classic field-ciphers. Encrypt swift and easy with this program, or try out the pencil-and-paper versions by following the instructions on how to use them "in the field", as many secret agents and soldiers did. Use ADFGVX, Caesar Shift, Single or Double Columnar Transposition, Playfair, the Straddling Checkerboard or Vigenère. Discover now, after the thrill of using my Enigma machine ;-), the secret world of the field ciphers. All comments and ideas welcome ;-) *** New Updated 3/17 !!! added Print option ***
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Other User Comments
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 2/17/2005 4:57:09 PM: D. Rijmenants
For a great site with all about codes, ciphers and codebreaking: www.vectorsite.net/ttcode.html
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2/17/2005 6:46:06 PM: James Miller
Thanks Dirk! This answered some of the questions I had from my "prescribed" reading.
James
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2/17/2005 7:45:52 PM: James Miller
I have a question. What if you used the Diagraph cypher method of encryption ... removed the spaces then XOR then Vigenere it. Would that make the "encrypted" message more secure since you're "flat-lining" the letter frequency which is already altered?
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2/18/2005 5:06:47 AM: D. Rijmenants
Fractionation on itselve is actually weak, and should always be combined with transpositions. It's a morevalue when suppressing peaks of freq. distribution (there are more ways to achieve homofony). Vigenere is a poly-alphabetic, weak and not a good candidate to combine with a homofone cipher. Ofcourse, it would be stronger, but one could use frequence analysis on vigenere to search for common pairs and once found, decode those pairs. Vigenere seems attractive to use in software, it can be performed byte after byte, but thats it's weakness, it doesn't achieve diffusion. Since transpositioning fractured text is not practical on large amounts of data, we were forced to go 'limited in size' and change to block ciphers, where you can code the bits and relocate them within a block of lets say 64 bits. Alternative to a vigenere key is a extremely long key, a stream cipher, but you need quality random and a initialize-vector or it can be used only once (big downside on RC4)
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2/18/2005 5:13:45 AM: D. Rijmenants
PS: I'm planning to add some other digraphs like Playfair and Four-Square ...have patience :-)
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2/18/2005 9:22:46 AM: Ulli
I went to the site you recommended, it's great, although one public key encryption is missing, or at least I couldn't find it, and that's the sum decomposition algorithm invented by hellman in the late 70's I think. also I am not quite sure whether it is called that in english - it's about finding summands in a (pseudo)random list of values that add together to give a total, the total being the encoded chunk and the postions of the summands within the list represent the decoded bits.
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2/18/2005 9:23:36 AM: Ulli
...anyway 5 globes for the link alone.
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2/18/2005 9:31:09 AM: D. Rijmenants
Yep, nice site. check out the Cyber page also http://www.vectorsite.net/indextt.html
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2/18/2005 7:53:59 PM: Ulli
I found it: it's called the Hellman Knapsack Algorithm and it was cracked by Shamir in the 80's
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5/15/2005 5:37:04 AM: helal mohsen
plz gaev me evrethaing
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12/14/2006 10:19:43 PM: Paul Turcksin
The usual XRSWH VGDDL EXCEL LENT VDAQS
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8/11/2008 3:58:30 PM: Risket
This program is awesome!! Playfair ciphers have always been my favorite ciphers! Ever since I was little kid I've loved writing messages using the Playfair Cipher. I actually thought about writing a program for decoding them. Which is how I ended up finding this one to see if it had already been done. I still think it'll be fun to make one though.
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11/29/2008 6:17:34 AM: khanh
I don't known the code "ADFGVX" please help me! Thank you very much!
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11/29/2008 6:18:06 AM: khanh
i
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