FIELD: physics.
SUBSTANCE: invention relates to a system and a method of electronic communication and a decoding device. System comprises one or more third-party processors configured to generate a pre-ATN value by combining a certain number with a special coding value (SEV), wherein SEV is a single-valued whole number; encrypting Pre-ATN using format-preserving encryption (FPE) to generate an encrypted authentication number (ATN); and send the encrypted ATN to the access control server (ACS) to use the encrypted ATN to generate the cardholder authentication (CAVV) verification code or the account holder authentication (AAV) code.
EFFECT: technical result consists in providing transaction authentication.
16 cl, 4 dwg
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