Cryptographic device and method for data encryption with per-round combined operations

摘要

A cryptographic device includes a key addition module, a first module, and a key module. The key addition module generates an input block based on a cipher key and a plaintext block. The first module generates an output block by performing a plurality of rounds of processing on the input block. The key module, for each of the rounds, provides a round key based on the cipher key. The first module includes an inversion module that, for each of the rounds, performs a matrix inversion operation on first intermediate data to generate second intermediate data. In a first round of the rounds, the first intermediate data is set equal to the input block. The first module also includes a combined operation module that, for each of the rounds, updates the first intermediate data by performing an affine transformation operation and a mix columns operation on the second intermediate data.

主权项

1. A cryptographic device comprising:
a key addition module configured to generate an input block based on (i) a cipher key and (ii) a plaintext block; a first module configured to generate an output block by performing a plurality of rounds of processing on the input block; and a key module configured to, for each of the rounds, provide a round key based on the cipher key, wherein the first module comprises
an inversion module configured to, for each of the rounds, perform a matrix inversion operation on first intermediate data to generate second intermediate data, wherein, in a first round of the rounds, the first intermediate data is set equal to the input block, anda combined operation module configured to, for each of the rounds, update the first intermediate data by performing an affine transformation operation and a mix columns operation on the second intermediate data.