question archive Consider a block cipher where the block size is one byte and the encryption (and decryption) algorithm is XORing the plaintext block with a one-byte key
Consider a block cipher where the block size is one byte and the encryption (and decryption) algorithm is XORing the plaintext block with a one-byte key
Subject:Computer SciencePrice: Bought3
Consider a block cipher where the block size is one byte and the encryption (and decryption) algorithm is XORing the plaintext block with a one-byte key. Given a plaintext P=badbadbadbad and a key K =2b, encrypt the plaintext using the following modes of operation: (a) Electronic codebook (ECB) mode. (4 pts) [b) Cipher block chaining (CBC) mode with initial value of IV =d8 (assume padding is not used). (6 pts) (c) Counter (CTR) mode with a four-bit nonce N =1001 and a four-bit counter that starts at zero. (6 pts) (d) List three reasons why the encryption algorithm (not the mode of operation) is insecure. (1 pt each)
