Problem 1: Is it possible to perform encryption operations in parallel on multiple blocks of plaintext in cipher block chaining (CBC) mode? How about decryption?
Problem 2: If a bit error occurs in the transmission of a ciphertext character in 8-bit CFB mode, how far does the error propagate? [
Problem 3: One local area network vendor provides a key distribution facility, as illustrated in Figure 1. a. Describe the scheme.
b. Compare this scheme to that of Figure 2. What are the pros and cons?
