nt a meet-in-the-middle attack on triple DES with three keys, assuming you had enough known plaintext, ciphertext pairs. (b) Approximately how many different keys would your attack have to try. (c) Approximately how much space would your attac

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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Cryptography

1. In triple DES with three keys the encryption is done as follows: C = EK3 (DK2 (EK1 (P))). (a) Explain precisely (in terms of K3, K2, K1) how you (as the cryptanalyst) would mount a meet-in-the-middle attack on triple DES with three keys, assuming you had enough known plaintext, ciphertext pairs. (b) Approximately how many different keys would your attack have to try. (c) Approximately how much space would your attack require?

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