Importance

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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.

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First Claim