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Encyclopedia > ECDSA

Elliptic Curve DSA (EC-DSA) is a variant of the Digital Signature Algorithm which operates on elliptic curve groups.

One of the reasons this algorithm is preferred over DSA is for efficiency reasons. To be secure DSA requires that p > 2512 to be secure against a Number Field Sieve attack and q > 2160 to be secure against a Baby-step giant-step attack. In practical terms this means the DSA is slower than RSA as a signature scheme.

However elliptic curve groups are not vulnerable to a Number Field Sieve attack, so they can be securely implemented with smaller key sizes and can be faster than RSA.

Results from FactBites:

 blake-wilson-xmldsig-ecdsa-09.txt (2213 words) ECDSA The Elliptic Curve Digital Signature Algorithm (ECDSA) is the elliptic curve analogue of the DSA (DSS) signature method [FIPS186-2]. The identifier for the ECDSA signature algorithm as defined in [Eastlake] is: http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha1 3.2 XML Schema Preamble and DTD Replacement 3.2.1 XML Schema Preamble The subsequent preamble is to be used with the XML Schema definitions given in the remaining sections of this document. ecdsa:ECDSAKeyValue'> 3.3 ECDSA Signatures The input to the ECDSA algorithm is the canonicalized representation of the dsig:SignedInfo element as specified in Section 3 of [XMLDSIG].
 ietf-pkix-ipki-ecdsa-02.txt (2379 words) The goal of this document is to profile ECDSA certificates, specifying the contents and semantics of attributes which were not fully specified by Part 1. Conforming applications supporting the ECDSA algorithm shall decode the subjectPublicKey as described in section 3.1.2 when the algorithm identifier is the one presented in 3.1.1. The ECDSA parameters in the certificate of the issuer shall apply to the verification of the signature.
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