Message authentication
In , message authentication or data origin authentication is a property that a message has not been modified while in transit () and that the receiving party can verify the source of the message. Message authentication does not necessarily include the property of .
Message authentication is typically achieved by using message authentication codes (MACs), (AE) or digital signatures. Some cryptographers have researched systems that send messages that appear to use a “message authentication without secrecy” system, but in fact also transmit a secret message.