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PRECOMPUTING INTERNAL AES STATES IN COUNTER MODE TO PROTECT KEYS USED IN AES COMPUTATIONS

  • US 20160211972A1
  • Filed: 01/19/2016
  • Published: 07/21/2016
  • Est. Priority Date: 02/28/2013
  • Status: Active Grant
First Claim
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1. A machine readable non-transitory storage medium containing executable program instructions which when executed by a data processing system cause the data processing system to perform a method comprising:

  • generating a set of precomputed block cipher encryption values from a key and a set of nonces, the number of nonces in the set of nonces being limited to less than or equal to a number determined from a predetermined maximum plaintext length having a plurality of blocks;

    storing the set of precomputed block cipher encryption values for use in an encryption operation, in a stream cipher mode, on plaintext; and

    transmitting the set of precomputed block cipher encryption values to another data processing system.

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