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Abstract

In this chapter we summarize the complexities of the major attacks described in this book. In the data collection phase, many pairs are encrypted under the unknown key on the target machine. The resultant ciphertexts are then fed into a data analysis algorithm, whose goal is to find the key. The complexities are quoted in terms of the number of encryptions needed to create all the necessary pairs in the data collection phase, since the data analysis algorithm is usually faster and uses fewer and simpler operations. These complexities are calculated for the electronic code book (ECB) mode of operation; however, the quoted known plaintext complexities hold even when the cipher block chaining (CBC) mode, the cipher feedback (CFB) mode, or the output feedback (OFB) mode are used.