Authentication

1. A security measure designed to establish the validity of a transmission, message, or originator, or a means of verifying an individual's authorization to receive specific categories of information or transaction approval (in the case of plastic cards or payment orders)
2. A security measure designed to protect a communications system against acceptance of a fraudulent transmission or simulation by establishing the validity of a transmission, message, or originator.
3. Evidence by proper signature or seal that a document is genuine and official. (Source: Federal Standard 1037C, Telecommunications: Glossary of Telecommunications Terms)
4. A cryptographic process performed during a chip-initiated transaction used to validate the integrity of data provided to identify one or more of the following: issuer, card, chip-reading device, and message content.

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