What is the difference between the AES decryption algorithm and the equivalent inverse cipher? What was the final set of criteria used by NIST to evaluate candidate AES cipher?
Subject Computer and Network Security
NU Year Set: 3.(a) Marks: 2+3 Year: 2014

The equivalent decryption algorithm of the AES-128 encryption is provided. It follows the same sequence of applying transformation procedures as the encryption algorithm but uses modified round keys.

The second type of AES decryption algorithms is called "Equivalent Inverse Cipher" in the FIPS publication, "Announcing the ADVANCED ENCRYPTION STANDARD (AES)" in 2001.

The difference of equivalent decryption algorithms and standard decryption algorithms can be summarized as:

  • Standard decryption algorithms use same round keys as the encryption algorithm but apply transformation procedures in a different sequence.
  • Equivalent decryption algorithms have the same sequence of applying transformation procedures as the encryption algorithm but uses modified round keys.
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