Coding device, decoding device and IC circuit

Details Coding device, decoding device and IC circuit Coding device, decoding device and IC circuit

1997-04-28

2000-12-19

Barron, Jr., Gilberto

Cryptography

Key management

Key distribution

380281, 380 47, 705 71, 713172, H04L 930, H04L 914

Patent

active

061636126

ABSTRACT:
A coding device, a decoding device, and an IC card capable of establishing highly reliable security are disclosed. A random number determining section 11, using a random number generating procedure selected with a random number generating procedure selecting section 10, determines a random number (a first secret key) C according to random number selecting information. On the other hand, an algorithm selecting section 13 selects a secret key code type of algorithm E according to algorithm selecting information. A secret key coding section 12, using the random number C and the algorithm E, converts data to be coded B into a secret key code sentence. After a publicized key coding section 15 converts the random number C and the algorithm selecting information into a publicized key code sentence, a combined code sentence forming section 14 forms a combined code sentence by combining together the secret key code sentence and the publicized key code sentence.

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