Synthetic IV (SIV) for non-AES ciphers and MACs

Document Type Expired Internet-Draft (individual)
Author Neil Madden 
Last updated 2019-05-26 (latest revision 2018-11-22)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document specifies how the Synthetic Initialization Vector (SIV) block cipher mode of operation can be adapted to non-AES ciphers and message authentication codes (MACs), with block sizes and MAC tag sizes other than 128 bits. Concrete instantiations are defined using the XChaCha20 nonce-extended stream cipher combined with HMAC-SHA256.


Neil Madden (

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