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 The RSA ds algorithm is a FIPS approved cryptographic algorithm for digital signature generation and verification. This is described in ANSI X9.31.

The ECDSA ds algorithm is a FIPS approved cryptographic algorithm for digital signature generation and verification. ECDSA is the elliptic curve analogue of the DSA. ECDSA is described in ANSI X9.62. The recommended elliptic curves for Federal Government use are included in Appendix 6.