Cryptostat

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Cryptostat; My work in progress
Topic Started: Sep 8 2005, 11:18 PM (410 Views)
Revelation	Oct 3 2005, 07:53 PM Post #16
Administrator Posts: 386 Group: Admin Member #1 Joined: August 23, 2005	I was already done with mine. It is included in the Vigenère Cracker.
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PulsarSL	Oct 3 2005, 09:00 PM Post #17
Super member Posts: 157 Group: Members Member #7 Joined: September 1, 2005	Revelation Oct 3 2005, 07:53 PM I was already done with mine. It is included in the Vigenère Cracker. It's not satisfying if someone else codes it



insecure	Oct 3 2005, 09:20 PM Post #18
Elite member Posts: 381 Group: Trusted Member Member #10 Joined: September 9, 2005	Known in the trade as NIH.



PulsarSL	Oct 5 2005, 07:51 PM Post #19
Super member Posts: 157 Group: Members Member #7 Joined: September 1, 2005	I finally got done with my simple frequency counter. It shouldn't have taken so long, but I'm lazy Now I'm gonna work on a "best guess" sort of thing, see what kind of results it can produce. I have a basic english frequency table, but obviously frequency is highly dependent on the length of the text. Anybody know of any tables streamlined for various lengths? So I can analyze the length of the ciphertext and select the frequency table appropriately? Pulsar



insecure	Oct 5 2005, 09:07 PM Post #20
Elite member Posts: 381 Group: Trusted Member Member #10 Joined: September 9, 2005	It's not so much that the frequency table depends on the length of the text, so much as the fact that the more data you have, the more accurate a guide the frequency table will be. Consider the following messages, all of which are the same length: NO CRYPTOGRAPHY TODAY THANK YOU PETER PIPER PICKED A PECK OF PI JEJUNE JOHN JONES JUMPS JOLLILY No one frequency table will give you decent, useful results for all these messages. As the size of the message increases, the chance of a decent frequency analysis also increases. But beware! Some chap once managed to write an entire book - which didn't just make sense but was also quite long and apparently fairly readable - without using a single letter E !!



PulsarSL	Oct 6 2005, 08:12 PM Post #21
Super member Posts: 157 Group: Members Member #7 Joined: September 1, 2005	insecure Oct 5 2005, 09:07 PM It's not so much that the frequency table depends on the length of the text, so much as the fact that the more data you have, the more accurate a guide the frequency table will be. Consider the following messages, all of which are the same length: NO CRYPTOGRAPHY TODAY THANK YOU PETER PIPER PICKED A PECK OF PI JEJUNE JOHN JONES JUMPS JOLLILY No one frequency table will give you decent, useful results for all these messages. As the size of the message increases, the chance of a decent frequency analysis also increases. But beware! Some chap once managed to write an entire book - which didn't just make sense but was also quite long and apparently fairly readable - without using a single letter E !! Yea, I heard about that. Pretty odd... er... hobby.



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