1
$\begingroup$

This question already has an answer here:

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?

$\endgroup$

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

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 3
    $\begingroup$ 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
  • 1
    $\begingroup$ 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
  • 1
    $\begingroup$ 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