Description
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? [10]
Problem 3: One local area network vendor provides a key distribution facility, as illustrated in Figure 1. a. Describe the scheme. [25]
- Compare this scheme to that of Figure 2. What are the pros and cons? [30]
Fig 1.
Problem 4: Summarize (i) discretionary access control, (ii) mandatory access control, (iii) role-based access control, and (iv) attribute-based access control. UAH gives all teachers access to Google. What kind of access control is this? [15+5]
