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In cryptography, the Elliptic Curve Digital Signature Algorithm offers a variant of the Digital Signature Algorithm which uses elliptic curve cryptography.

Elliptic Curve Digital Signature is a variant of dsa algorithms. It allows in some cases a smaller public key (for instance, 160 bit in ecdsa compared to 1024 bit in dsa for 80 but security level), and requires the two sides to agree on a curve's field and equation, as well as a prime order on the curve and a multiplicative of the order.

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