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In this paper, the authors study the effects of channel errors on security and decoding error probability of three encryption systems where encrypted message is sent and eavesdropped over Binary Symmetric Channels (BSC). The three systems are all based on Data Encryption Standard (DES) in Cipher FeedBack (CFB) mode. They are DES only (DC), DES Concatenated with Reed Solomon encoding (DCRS), and DES Concatenated with RS coding and S-box diffusion (DCRSS). They adopt linear cryptanalysis to quantitatively measure the effects of channel errors on the security of these systems. They have found the required known cipher-plain text pairs in each system for linear attack launched by Eve, an eavesdropper.
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