Deterministic ECDSA and EdDSA Signatures with Additional Randomness

Document Type Expired Internet-Draft (cfrg RG)
Authors John Preuß Mattsson  , Erik Thormarker  , Sini Ruohomaa 
Last updated 2020-09-12 (latest revision 2020-03-11)
Stream Internet Research Task Force (IRTF)
Intended RFC status (None)
Expired & archived
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Stream IRTF state Candidate RG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Deterministic elliptic-curve signatures such as deterministic ECDSA and EdDSA have gained popularity over randomized ECDSA as their security do not depend on a source of high-quality randomness. Recent research has however found that implementations of these signature algorithms may be vulnerable to certain side-channel and fault injection attacks due to their determinism. One countermeasure to such attacks is to re-add randomness to the otherwise deterministic calculation of the per-message secret number. This document updates RFC 6979 and RFC 8032 to recommend constructions with additional randomness for deployments where side-channel attacks and fault injection attacks are a concern.


John Preuß Mattsson (
Erik Thormarker (
Sini Ruohomaa (

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