COMPUTING KEY-SCHEDULES OF THE AES FOR USE IN WHITE BOXES

摘要

Some embodiments provide a method for performing a cryptographic process. The method receives first and second cipher keys. The method generates a set of subkeys corresponding to each of the first and second cipher keys. The set of subkeys for the first cipher key is dependent on the first cipher key and the second cipher key. The method performs the cryptographic process by using the generated sets of subkeys.

主权项

1. A method for performing a cryptographic process comprising a plurality of rounds, the method comprising:
receiving first and second cipher keys; for the plurality of rounds, generating a first set of subkeys corresponding to the first cipher key as a function of the first cipher key; for the plurality of rounds, generating a second set of subkeys corresponding to the second cipher key, wherein for each round after a first round, a subkey of the second set of subkeys is a function of (i) a first subkey of the first set of subkeys from a previous round and (ii) a second subkey of the second set of subkeys from the previous round; and performing the cryptographic process using the generated sets of subkeys.