Cryptogram communication system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Jan 30, 2003
app pub date -
Jun 4, 2002
filing date -
Mar 19, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
First, a terminal device (1) transmits a connection request to a server device (2) (step S1). When receiving this connection request, the server device (2) selects a single piece of cipher key data (71) from a cipher key data set (62) corresponding to the terminal device 1 (step S2), and transmits a key identifier (72) of the selected cipher key data (71) to the terminal device (1) (step S3). When receiving the key identifier (72), the terminal device (1) reads a key identifier (52) identical with the key identifier (72) from key list data (21), enciphers the received key identifier (72) with cipher key data (51) corresponding thereto (step S4), and transmits it to the server device (2) (step S5). When receiving the enciphered key identifier (72), the server device (2) deciphers it (step S6), and compares the deciphered key identifier (72) and the key identifier (72) of the cipher key data selected before(step S7).
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