One-time pad decryption
You and I are trying to get a message across enemy lines, and we don't want it intercepted. Luckily, we decided on an initial secret key of
01011
. Unluckily, I need to get you a message that's a bit longer than that. Decrypt this ciphertext to get my original message
10001011
.
You'll need to wrap around the key in order to solve this one. In other words, when I encoded this message and I got to the bit of my message, I would start back at the first bit of the key.
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1 solution
To decrypt this cipher text, XOR each bit with the corresponding bit in the secret key. Because the cipher text is longer than the secret key, however, we must wrap around and begin again at the beginning.
To decrypt this one bit at a time, start with the first bit,
1, and XOR it with the first bit of the secret key,0.1and0are different bits so the answer is1. XORing the second bit of the cipher text,1, with the second bit of the key,1, gives us a0because they are the same bit. Continue this process for the entire cipher text. When it comes time to decrypt the 6th bit of the cipher text, XOR it with the first first bit of the secret key. After you've decrypted every bit in the cipher text, the answer is1101000.