HARDWARE STRUCTURE OF SEED BY USING PIPELINED STRUCTURE

摘要

PURPOSE: A hardware structure of a SEED engine by using a pipelined structure is provided to increase the speed of data encryption by dividing and pipelining one round into three stages at the encryption of ECB(Electronic Code Book) mode and the decryption of CBC(Cipher Block Chaining) mode. CONSTITUTION: The SEED engine is designed to support the ECB and CBC modes. In the encryption of the ECB mode, an encryption block includes a J1 function block, a J2 function block, a key mixing block. The encryption block encodes three plaintexts at a time by using the pipelined structure to process one round during three clocks. In the encryption of the CBC mode, an input of an encryption block is performed by XOR operation on the plaintext and a previous ciphertext so that the pipelined structure is not available. In the decryption of the CBC mode, a plaintext is generated by performing XOR operation on the decoding result of the ciphertext and the previous ciphertext so that the pipelined structure is available.