Electronic funds transfer system with means for verifying a personal identification number without pre-established secret keys

作者: Theodore Stein

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摘要: An electronic funds transfer system employs a means to verify personal identification number PE entered by the user with correct PIN (PT) stored at host terminal. The remote and terminals each generate an encryption key, encrypt PT respective terminals. These values are transmitted other terminal, where they re-encrypted using key. double-encrypted numbers then compared. user-entered can thus be verified without need share en key between transformation is of type results successive encryptions does not depend on order encryption.