Digital Signature is

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Digital signatures rely on public-key cryptography to prove who sent a message and that its contents haven’t been altered. In practice, a hash of the message is created and that hash is encrypted with the sender’s private key, producing the digital signature that accompanies the message. The recipient then uses the sender’s public key to decrypt the signature back into the hash and compares it with a freshly computed hash of the received message. If they match, you’ve got authentication of the sender, data integrity, and non-repudiation—the sender can’t deny having sent it. This mechanism is not simply a scanned signature, a code number, or software that merely recognizes a signature; it’s a cryptographic process that ensures trust. The broader idea behind digital signatures is enabled by public-key cryptography, which underpins the signing and verification steps.