Cryptography

1. Suppose that you intercept the Vernam encrypted ciphertext XJNRJ QPISY BZGZM AJHCL LZ Suppose further that p = 3, 9 = 4, and that the original plaintext starts with KEEPCA. (a) Reconstruct the encryption vectors A (of length p) and B (of length q), as well as the key R they generate. (b) Decipher the message. 1/12 1. Suppose that you intercept the Vernam encrypted ciphertext XJNRJ QPISY BZGZM AJHCL LZ Suppose further that p = 3, 9 = 4, and that the original plaintext starts with KEEPCA. (a) Reconstruct the encryption vectors A (of length p) and B (of length q), as well as the key R they generate. (b) Decipher the message. 1/12