Patent ID: 8875264
Filing Date: 2014-10-28
Classification: G06F,H04L

Abstract:
1. An off-line two-factor user authentication system designed to use a one-time-password derivation rule as a password of a user subject to authentication, in such a manner that a plurality of pattern elements are arranged in a given pattern format and presented as a presentation pattern to a client being used by the user, and the one-time-password derivation rule is applied to certain ones of the pattern elements included in the presentation pattern at specific positions, so as to create a one-time password, and further use information identifying the client being used by the user, as a second authentication factor, the off-line two-factor user authentication system comprising: an off-line authentication support server for supporting off-line authentication of a plurality of the users, the off-line authentication server comprising a processor and a memory to perform information processing; and a plurality of the clients, each comprising a processor and a memory to perform information processing, and each serving as an off-line two-factor authentication client which is a terminal capable of authenticating each of the users in an off-line state of being not network-connected although being connectable to the off-line authentication support server via a network, the off-line two-factor authentication client including: wherein the off-line authentication support server includes: and wherein the off-line two-factor authentication client further includes: