Abstract: With the development of the technology of computer and network communication, digital signature schemes have got extensive application. In the paper here, three applied schemes based on USA’s digital signature standard DSS/DSA are presented. They include multisignature scheme, digital signature scheme with （t,n） shared verification and remote password authentication scheme. The multisignature scheme allows multiple signers to sign the same message separately and all individual signatures can be combined into a multisignature. The digital signature scheme with （t,n） shared verification lets any t verifiers in n collaborate to verify a signature. The remote password authentication scheme combines the password authentication with digital signature DSA closely, which provides a new way of thinking for password authentication.