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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?


marked as duplicate by e-sushi, DrLecter, Maarten Bodewes, rath, mikeazo May 11 '14 at 3:34

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    $\begingroup$ Welcome to Cryptography Stack Exchange. Your question is missing some details – which encrytion algorithm is in use? If it is some misused one-time-pad, look other questions with that tag. $\endgroup$ – Paŭlo Ebermann May 10 '14 at 12:12
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    $\begingroup$ Didn't know Crypto I was running again at Coursera... $\endgroup$ – Maarten Bodewes May 10 '14 at 18:18
  • $\begingroup$ 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. $\endgroup$ – firehorse May 10 '14 at 19:29
  • $\begingroup$ 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. $\endgroup$ – mikeazo May 11 '14 at 3:31
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    $\begingroup$ See also: How does one attack a two-time pad (i.e. one time pad with key reuse)? $\endgroup$ – CodesInChaos May 11 '14 at 12:57