25 Jul Cryptography Worksheet
- An organization uses same stream cipher key multiple times. An attacker who knows that, captures two ciphertexts C1 and C2 and finds that,
The attacker also knows that the plaintexts are composed of only English capital letters without any punctuations or space, and that part of the plaintexts contains the word: “PRESIDENT”. He was able to recover both the plaintexts. Show, how. (Points 25)
Hints: Slide ASCII for “PRESIDENT” over C1⊕C2 and XOR them. You can start from the left and keep sliding right, or start from the right and keep sliding left until you find a meaningful 9 letter phrase (since PRESIDENT is a 9 letter word). Once you retrieve the partial plaintexts, use your intuition and linguistic observations to complete the rest as much as possible.
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