تلخیص
Practical cracking of Data Encryption Standard (DES) and mathematical cracking of Advanced
Encryption Standard (AES) is seriously questionable despite the fact that AES retains good length of the
encryption key, but still it’s all encryption rounds have been cracked mathematically. Therefore, there is
a need to revisit the cracking excursion of these well-known cryptosystems to inquire into potential
discrepancies associated with them and to evolve the design of future block ciphers. Thus, this study aims
to enlighten the cryptanalysis journey of AES and DES, including all DES variants (TDES, DESX, and
DEX+) to discuss latent weaknesses, issues and problems associated with these block ciphers. To
accomplish this review task, quality of related studies was collected from several well-known research
repositories, and each study was critically analyzed. Earlier review-efforts were found relatively
marginal in scope, capacity and are not up-to-date with the latest issues, and cryptanalysis results
thereby differ with this work. The resultant discussion shows that known parameters like static
substitution, static permutation, fixed block size and repeated encryption rounds with a similar set of
encryption operations support the crackers to execute effective cryptanalysis in symmetric block ciphers.
Therefore, encrypting the secret data with too many repeated encryption rounds with identical
encryption operations is not as effective in enhancing the security of symmetric block cipher as it is
usually believed.
I.A. Shoukat, U. Iqbal, M.S.A. Malik, F. Sahar. (2019) Problems and Progressive Cryptanalysis of Prominent Block Ciphers, The Nucleus, Vol 56, Issue 3.
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