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The number of tests required to break the Double DES algorithm are

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The number of tests required to break the Double DES algorithm are

(a) 2112

(b) 2111

(c) 2128

(d) 2119

I got this question in homework.

I need to ask this question from The Data Encryption Standard (DES) and It’s Strength topic in chapter Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

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Right option is (b) 2111

Explanation: For Double DES key is 2112 bits, should require 2111 tests to break.

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