Digital signature schemes

• Similar to a MAC, but with two keys

  • sender does sig = sign(priv,message)
  • receiver checks that message = vrfy(pub,sig)

• Some public key encryption systems also work as signature schemes (RSA, etc), some signature schemes only do signature (DSA)

• Establishes integrity & authenticity, but also allows 3rd party to verify (receiver can’t forge)

  • unless private key was compromised...

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