Using Authenticated Encryption with Replay prOtection (AERO) in SRTP

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Last updated 2014-04-24 (latest revision 2013-10-21)
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Authenticated Encryption with Replay prOtection (AERO) is a cryptographic technique that provides all of the security services that are used in the Secure Real-time Transport Protocol (SRTP). This note describes how to use AERO in SRTP. AERO has minimal data expansion, avoids the need to manage implicit state, and provides strong misuse resistance. These properties make it an ideal cryptographic transform for SRTP, as it enables SRTP to easily handle multiple senders sharing the same key, multiple receivers with late- joiners in a session, decentralized conferences with minimal control, and mixers that selectively forward RTP traffic. RTP architectures that utilize AERO can use the normal SSRC collision detection mechanism, and can ignore problematic SRTP artifacts such as the Roll-Over Counter (ROC) and Initial Sequence Number.


David McGrew (
Dan Wing (
John Foley (

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