1. Figure 2.12b shows an alternative to CTS for producing ciphertext of equal length to the plaintext when the plaintext is not an integer multiple of the block size. a. Explain the algorithm. b....

1. Figure 2.12b shows an alternative to CTS for producing ciphertext of equal length to the plaintext when the plaintext is not an integer multiple of the block size.

a. Explain the algorithm.

b. Explain why CTS is preferable to this approach illustrated in Figure 2.12b.

2. If a bit error occurs in the transmission of a ciphertext character in 8-bit CFB mode, how far does the error propagate?