| 摘要 |
An operation method for supporting AES(Advanced Encryption Standard) and ARIA(Academy, Research Institute, and Agency) encryption/decryption functions, and a device thereof are provided to apply to a smart card, an electronic passport, and a server-level encryption device requiring both of the AES and ARIA algorithms by minimizing a hardware area while supporting both of the AES and ARIA algorithms. A key scheduler(350) generates a round key by using an input key. A round function operator(310) generates encrypted/decrypted data by using input data and the round key. The round function operator includes integrated substitution and diffusion layers(320,330) performing both of AES and ARIA algorithms. The integrated substitution layer includes a first block performing a role of an AES S(Substitution)-box and a second block performing the role of AES/ARIA S-box. The integrated diffusion layer performs the role of an AES Mixcolumns function, an AES InvMixcolumns function or an ARIA diffusion function selectively.
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