I have ten piece of ciphered texts. I know that they ciphered with a same-length key. Any idea how I can decrypt the ciphertexts? What kind of algorithms should I use? What are the points of taking care of 'XORing' these texts with each other and space character? (text ciphered with the asymmetric key) should we use the frequency analysis?
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3Welcome to Cryptography Stack Exchange. Your question is missing some details – which encrytion algorithm is in use? If it is some misused [tag:one-time-pad], look other questions with that tag. – Paŭlo Ebermann May 10 '14 at 12:12
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1Didn't know Crypto I was running again at Coursera... – Maarten Bodewes May 10 '14 at 18:18
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first of all i am student in cs and got this take-home. As i said have only ten short ciphered text and also information of those ciphered with the same key...(XOR cipher and a key). That's all. – firehorse May 10 '14 at 19:29
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You are looking for how to attack one time pad reuse. There is a lot of information already on this site for that. Have a look around. – mikeazo May 11 '14 at 03:31
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1See also: How does one attack a two-time pad (i.e. one time pad with key reuse)? – CodesInChaos May 11 '14 at 12:57
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thank you very much for your advices. i found what i am searching for. it was "many time pad cipher text attacks ";) – firehorse May 12 '14 at 20:53