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User Private Key (PR): This key is publicly known and can be shared with anyone. It's used to verify digital signatures created with a corresponding private key.
User Public Key (PU): A top-secret cryptographic key only possessed by the user is used in DSA algorithm’s digital signature generation. As it is, the private key must be kept secret and secure because it proves that a given user is genuine.
Signing (Sig): Signing involves creating a digital signature with the help of a user's private key. In case of DSA, this process requires mathematical operations to be performed on the message that should be signed using a given private key in order to generate a unique signature for that message.
Verifying (Ver): Verifying is the process of verifying whether or not a digital signature has been forged using its corresponding public key. In DSA, this involves comparing the messages hash against the verification value through mathematical operations between two binary strings – one representing an encrypted data and another one representing plain-text original message.