Authentication method, communication method, and information pro

Details Authentication method, communication method, and information pro Authentication method, communication method, and information pro

1997-06-20

2000-06-06

Swann, Tod R

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

713170, 713171, 709227, H04L 912, H04L 914, G06F 15163

Patent

active

060732369

ABSTRACT:
Mutual authentication is performed. A reader/writer (R/W) transmits to an IC card a code C.sub.1 that is a random number R.sub.A encrypted using a key K.sub.B. The IC card decrypts the code C.sub.1 into plain text M.sub.1 using the key K.sub.B. The IC card transmits to the R/W a code C.sub.2 that is the plain text M.sub.1 encrypted using a key K.sub.A and a code C.sub.3 that is a random number R.sub.B encrypted using the key K.sub.A. The R/W decrypts the codes C.sub.2 and C.sub.3 into plain text M.sub.2 and plain text M.sub.3, respectively, using the key K.sub.A. When the R/W determines that the plain text M.sub.2 and the random number R.sub.A are the same, it authenticates the IC card. Next, the R/W transmits to the IC card a code C.sub.4 that is the plain text M.sub.3 encrypted using the key K.sub.B. The IC card decrypts the code C.sub.4 into plain text M.sub.4 using the key K.sub.B. When the IC card determines that the plain text M.sub.4 and the random number R.sub.B are the same, it authenticates the R/W.

REFERENCES:
patent: 5737421 (1998-04-01), Audebert
patent: 5850446 (1998-12-01), Berger et al.
patent: 5870473 (1999-02-01), Boesch et al.

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