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The aim in doing this was to prove that the key size of DES was not sufficient to be secure. DES uses a bit key , meaning that there are 2 56 possible keys under which a message can be encrypted. This is exactly 72,,,,,, or approximately 72 quadrillion possible keys. One of the major criticisms of DES, when proposed in , was that the key size was too short. The brute force attack showed that cracking DES was actually a very practical proposition.

Most governments and large corporations could reasonably build a machine like Deep Crack. This time, the operation took less than a day — 22 hours and 15 minutes. The decryption was completed on January 19, Deep Crack was designed by Cryptography Research, Inc. The principal designer was Paul Kocher , president of Cryptography Research.

The search was coordinated by a single PC which assigned ranges of keys to the chips. The entire machine was capable of testing over 90 billion keys per second. It would take about 9 days to test every possible key at that rate. On average, the correct key would be found in half that time. In , another custom hardware attack machine was designed based on FPGAs. This tool effectively allows members of the general public to recover a DES key from a known plaintext-ciphertext pair in about 24 hours.

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Block ciphers security summary. Initialization vector Mode of operation Padding. History of cryptography Cryptanalysis Outline of cryptography. Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography.

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