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Consider the following statements with respect to digital signatures:
S1 : Digital signature ensures authenticity of the sender and integrity of the message.
S2 : Using a public-key system, the signer signs using his private key and the verifier verifies using his public key.
S3 : Asymmetric key cryptography is based on secret key while symmetric key cryptography is based on both public and private key.

Which of the following is true?

Ans is given S1 and S2 but how S2 is true please explain

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