Question: You want to build a hardware device to do block encryption in the cipher block chaining (CBC) mode using an algorithm stronger than DES. 3DES

You want to build a hardware device to do block encryption in the cipher block chaining (CBC) mode using an algorithm stronger than DES. 3DES is a good candidate. Figure 6.11 shows two possibilities, both of which follow from the definition of CBC.Which of the two would you choose:

a. For security?

b. For performance? K, K- P EDE C-1 C (b) One-loop CBC K K K

K, K- P EDE C-1 C (b) One-loop CBC K K K P. E D B E C B-1 C-1 (b) Three-loop CBC Figure 6.11 Use of Triple DES in CBC Mode

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a If the IVs are kept secret the 3loop case has more bits to be determined and is therefore more secure than 1loop for brute force attacks b For softw... View full answer

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