Wednesday, July 20, 2016

DES (Data Encryption Standard) is weak because of the Key size but what else make DES weak?

1. Key Complement weakness reduces brute force attack to require 255 possibilities.

2. If the possibilities of data what we are encrypting are limited, it's comparatively easier (not easy).

2.1. Differential cryptanalysis: To break the full 16 rounds, differential cryptanalysis requires 249 chosen plaintexts.
2.2. Linear cryptanalysis: FPGA Implementation of the Linear Cryptanalysis was able to return DES key in 12-15 hrs.

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