Contents transmission control method with user...

Details Contents transmission control method with user... Contents transmission control method with user...

H - Electricity

04

L

H04L 9/32 (2006.01) H04L 12/22 (2006.01) H04L 12/58 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2214911

A user sets n=0, his mail account A and password S, then computes V0=E(A,S), W0=E(A,V0), V1=E(A,A~1), W1=E(A,V1) and M0=E(W1,V0), and initially registers W0, W1, M0 and A by e-mail in a mail server. At a visiting site the user sends a service request and A to the mail server from an arbitrary terminal connected to the Internet, and the mail server reads out the authentication session number n corresponding to the identifier A and sends it back to the user. The user computes V n-1=E (A,S+~(n-1)), V n+1=E(A,S~(n+1)), W n+1=E(A,V n+1)- V n=E(A,S~n) and M n=E(W n+1,V n) and sends V n-1, W n+1 and M n to the mail server. The mail server computes E(A,V n-1) and E(W n,V n-1) and if they agree with preregistered W n-1 and M n-1, respectively, the mail server accepts the user as valid and sends a mail message of the user.

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