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POInstead of using common ciphers such as AES or blowfish twofish, how creating my own cipher?
 

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  1. POInstead of using common ciphers such as AES or blowfish twofish, how creating my own cipher?
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    <p>I don't know much about the heavy math behind cryptosystems, I get stuck when it gets bad with the Z/nZ algebra, and sometimes with all these exponent of exponents. It's not I don't like it, it's just that the information you find on the web are not easy to follow blindly.</p> <p>I was wondering: how reliable can a algorithm be when it encodes a message into plain binary. If my algorithm is arbitrary and known only to me, how can a cryptanalist study an encrypted file and decrypt it, with or without having the decoded file ?</p> <p>I'm thinking about not using ASCII text to code my message, and I have some ideas to make this algorithm/program.</p> <p>Attacking a AES or blowfish crypted file is more trivial for a cryptanalyst, than if the algorithm the file is encrypted with is unknown to him, but how does he do then ?</p> <p>I don't know if I understanded well, but a CS teacher once told me that codes are harder to crack that crypted ciphers.</p> <p>What do you think ?</p>
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    1. USjokoon
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      1. POInstead of using common ciphers such as AES or blowfish twofish, how creating my own cipher?
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    1. COThis sounds a bit like security by obscurity. Probably a bad idea!
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      1. POInstead of using common ciphers such as AES or blowfish twofish, how creating my own cipher?
      1. USScottE
    2. COVery bad idea. AES and Blowfish are considered secure exactly because they are open and available to everyone to analyze. Just because the details of an algorithm aren't available doesn't mean that it will suddenly be resilient to all cryptanalytic attacks. By all means, go ahead and write your crypto algorithm, but before you use it for anything, get it published and peer reviewed for a while so that people can discover any problems the system may have.
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      1. POInstead of using common ciphers such as AES or blowfish twofish, how creating my own cipher?
      1. USReese Moore
    3. COI suggest you try reading "Practical Cryptography" by Bruce Schneier and Niels Ferguson. It's interesting, and it explains why that isn't a good idea.
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      1. USAndy Burns
 

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