Dycrypter With Python

Re: Dycrypter With Python

Post by rawrchickens on Thu Apr 25, 2013 4:14 am
([msg=75347]see Re: Dycrypter With Python[/msg])

Edgar Allan Poe was a genius! Thanks for the quote the_ordinary very clever.
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Re: Dycrypter With Python

Post by v_freak on Thu Jan 29, 2015 7:53 pm
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Just finished writing my own little python un-scrambler. Felt AWESOME! Though when going through the attempts I almost missed it thanks to the...unique way the words are written! Great challenge!
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Re: Dycrypter With Python

Post by poetics5 on Tue Jul 28, 2015 1:26 pm
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I wrote a decrypter with javascript. Key thing to remember are the most common lowest number is the most common ascii char. Also Array.sort() came in really handy.
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Re: Dycrypter With Python

Post by anonymous501 on Mon Oct 19, 2015 11:23 am
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alternatively, I used a script that tries all passwords as numbers and checks the code for ASCII character that a user wouldn't use, such as null bytes. When none of these are found it will decode it. Uses slightly more code (27 lines total), but would work on practically any message.

if the message were, for example, a piece of code, or contained some very precise GPS coordinates, or has some other reason why frequency analysis wouldn't work, this code would still pick it up. While frequency analysis relies on writing style, this method could also decode "hai, potatoes".
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Re: Dycrypter With Python

Post by cyberdrain on Mon Oct 19, 2015 4:53 pm
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anonymous501 wrote:alternatively, I used a script that tries all passwords as numbers and checks the code for ASCII character that a user wouldn't use, such as null bytes. When none of these are found it will decode it. Uses slightly more code (27 lines total), but would work on practically any message.

if the message were, for example, a piece of code, or contained some very precise GPS coordinates, or has some other reason why frequency analysis wouldn't work, this code would still pick it up. While frequency analysis relies on writing style, this method could also decode "hai, potatoes".

That's called the bruteforce method. Effective yes, efficient, not so much ;)
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Re: Dycrypter With Python

Post by anonymous501 on Fri Nov 13, 2015 10:29 am
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cyberdrain wrote:
anonymous501 wrote:alternatively, I used a script that tries all passwords as numbers and checks the code for ASCII character that a user wouldn't use, such as null bytes. When none of these are found it will decode it. Uses slightly more code (27 lines total), but would work on practically any message.

if the message were, for example, a piece of code, or contained some very precise GPS coordinates, or has some other reason why frequency analysis wouldn't work, this code would still pick it up. While frequency analysis relies on writing style, this method could also decode "hai, potatoes".

That's called the bruteforce method. Effective yes, efficient, not so much ;)

in this particular case it is actually relatively efficient, since the password value can never be lower than the lowest combined number, and the algoritm only starts checking from thereon. therefore, it will always work in aboout 150 trials.
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