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US 2004/0165721 A1Published application
Encryption/decryption unit and storage medium
AssigneeKabushiki Kaisha Toshiba
InventorsFumihiko Sano, Shinichi Kawamura, Hideo Shimizu
Life of this patent
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AssigneeKabushiki Kaisha Toshiba
InventorsFumihiko Sano, Shinichi Kawamura, Hideo Shimizu
Estimating the term…
An encryption/decryption unit includes a first data encryption/decryption section for performing an encryption or decryption process, a first data substitution section for performing data substitution of an output from the first encryption/decryption section according to a predetermined permutation table, a second data encryption/decryption section for performing an encryption or decryption process for an output from the first data substitution section, a second data substitution section for performing data substitution of an output from the second data encryption/decryption section according to a predetermined permutation table, and a third data encryption/decryption section for performing an encryption or decryption process for an output from the second data substitution section.
An encryption/decryption unit for encrypting a plaintext into a ciphertext and/or decrypting a ciphertext into a plaintext, comprising:
A computer-readable storage medium storing a program for controlling an encryption/decryption unit for encrypting a plaintext into a ciphertext and/or decrypting a ciphertext into a plaintext, the program comprising:
Dependencies are inferred from the claim text.