ENCRYPTION PROCESSING DEVICE AND METHOD CAPABLE OF DEFENDING DIFFERENTIAL POWER ANALYSIS ATTACK

摘要

The invention discloses an encryption processing device and a method capable of defending differential power analysis attack. In the encryption processing device provided by an embodiment of the invention, a SecMasking unit is achieved in a structure that a universal random masking technique services as a basis; a SecPrepare unit is achieved in a structure that a bitwise XOR device services as a basis; and a SecSbox unit is achieved in a mode that table look-up results are updated longitudinally and transversely in real time on the basis of a random masking technique. According to the encryption processing device and method, work power consumption of a cryptographic operation equipment circuit can have no relation with operation data and calculation operations. In addition, the encryption processing device and method can be widely used for encrypting and decrypting operation cryptographic equipment needing high safety performance.

主权项

1. An encryption processing device capable of defending differential power analysis attack, comprising:
a mask processing circuit (SecMasking) unit, used for splitting source data pr expected to carry out Sbox table look-up operations into a plurality of random data on the basis of a random masking technique; a preprocessing circuit (SecPrepare) unit, used for carrying out AddRoundKey transformation on the plurality of random data and currently effective cryptographic algorithm sub-key kr according to random digit xr, carrying out Sbox transformation preprocessing which can at least take away the participation effect of the random digit xr based upon a real-time updating variable gcnt and outputting the preprocessing data br; and a Sbox circuit (SecSbox) unit, used for carrying out longitudinal and transverse Sbox look-up process and real-time updating process of the preprocessing data br on the basis of the random masking technique and according to a random digit yr and a random digit zr.