The Free On-line Dictionary of Computing (30 December 2018):

Digital Signature Standard

    The NIST's standard for digital
   signatures (authenticating both a message and the signer)
   that was first announced in 1991.  It is based on an
   algorithm using discrete logarithms, which is a variant of
   the Elgamal algorithm with Schnorr's improvements.  DSS's
   security is currently considered very strong - comparable to
   RSA.  It is estimated that DSS's 1024-bit keys would take
   1.4E16 MIPS-years to crack.

   (1995-11-16)