Elliptic Curves for Security

Document Type Replaced Internet-Draft (cfrg RG)
Author Adam Langley 
Last updated 2015-10-14 (latest revision 2015-01-06)
Replaced by RFC 7748
Stream Internet Research Task Force (IRTF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream IRTF state (None)
Consensus Boilerplate Unknown
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-irtf-cfrg-curves
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This memo describes an algorithm for deterministically generating parameters for elliptic curves over prime fields offering high practical security in cryptographic applications, including Transport Layer Security (TLS) and X.509 certificates. It also specifies a specific curve at the ~128-bit security level.


Adam Langley (agl@google.com)

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