Method for protecting IC cards against power analysis attacks

摘要

A method for protecting data against power analysis attacks includes at least a first phase of executing a cryptographic operation for ciphering data in corresponding enciphered data through a secret key. The method includes at least a second phase of executing an additional cryptographic operation for ciphering additional data in corresponding enciphered additional data. An execution of the first and second phases is undistinguishable by the data power analysis attacks. Secret parameters are randomly generated and processed by the at least one second phase. The secret parameters include an additional secret key ERK for ciphering the additional data in the corresponding enciphered additional data.

主权项

1. A method of protecting data against a power analysis attack comprising:
performing at least one cryptographic operation to cipher the data into corresponding enciphered data through a secret key, using a processor of an IC card; and performing at least one additional cryptographic operation on both the enciphered data and additional data thereby corresponding enciphered additional data through an additional secret key different than the secret key, using the processor; the at least one cryptographic operation being performed a plurality of times, and the at least one additional cryptographic operation being randomly performed between performances of the at least one cryptographic operation such that the enciphered data is interleaved with the enciphered additional data; wherein the additional data and the additional secret key are randomly generated.