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AH Definition: AH (Authentication Header) is a protocol used in IPsec to provide connectionless integrity and data origin authentication for IP datagrams, ensuring that the data has not been altered or tampered with during transmission.
AH (Authentication Header) is a protocol used in IPSec (Internet Protocol Security) for providing data origin authentication and connectionless integrity verification. It does this by adding a header to the IP packet which includes a cryptographic hash of the entire packet, ensuring that the data has not been altered in transit and that it originates from the claimed source.