This Standard specifies a method for authenticating card-originated electronic messages relating to financial transactions.

NOTE: The identity of the sending party is implicitly validated by proper use of this Standard. Further, this Standard provides a method for protection against accidental or deliberate alteration of messages between sending and receiving parties.

This Standard does not provide for—

(a) the use of encryption for the protection of messages against unauthorized disclosure; or

(b) protection against message loss or duplication.