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An authentic message is one that it is not a replay of a previous message, has arrived exactly as it was sent (without errors or alterations), and comes from the stated source (not forged or falsified by an imposter or fraudulently altered by the recipient).
Encryption in itself does not automatically authenticate a message. It protects against passive eavesdropping automatically, but does not protect against some forms of active attack. Encryption can be used to authenticate messages.