Using Counter Modes with Encapsulating Security Payload (ESP) and Authentication Header (AH) to Protect Group Traffic

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Counter modes have been defined for block ciphers such as the Advanced Encryption Standard (AES). Counter modes use a counter, which is typically assumed to be incremented by a single sender. This memo describes the use of counter modes when applied to the Encapsulating Security Payload (ESP) and Authentication Header (AH) in multiple- sender group applications.