Suppose we have two ciphertexts from the one-time pad that were encrypted using the same key (so, the two-time really). Their binary representations are c1 = 1011001010 c2 = 0100110101 What can we say about the corresponding plaintext messages mi and m2? mi = m2 00000000 = m2 we cannot say anything about my and m2 except that they have the same length mi = m2 11111111 = m2 

What is NOT true of the one time pad? the key is the same length as the message O it provides data integrity O it provides confidentiality when used correctly it provides perfect secrecy