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

PA P. C-1 A Kj, K2 EDE An () One-loop CC K2 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 7.17 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?

PA P. C-1 A Kj, K2 EDE An () One-loop CC K2 D B E (b) Three-loop CBC Figure 7.17 Use of Triple DES in CBC Mode

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