TLS Fallback Signaling Cipher Suite Value (SCSV) for Preventing Protocol Downgrade Attacks

Document Type Replaced Internet-Draft (individual)
Authors Bodo Moeller  , Adam Langley 
Last updated 2014-07-07 (latest revision 2014-05-31)
Replaced by RFC 7507
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Expired & archived
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IESG IESG state Replaced by draft-ietf-tls-downgrade-scsv
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines a Signaling Cipher Suite Value (SCSV) that prevents protocol downgrade attacks on the Transport Layer Security (TLS) protocol. It updates RFC 2246, RFC 4346, and RFC 5246.


Bodo Moeller (
Adam Langley (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)