What is the primary purpose of a digital signature in cryptography?

A digital signature is a cryptographic technique used to validate the authenticity and integrity of a message, software, or digital document. It assures the recipient that the message has not been tampered with and that it comes from the claimed sender. Digital signatures are created using the sender's private key, and anyone with the sender's public key can verify the signature. Option A (Encrypt the message content) is incorrect because encryption is not the primary function of a digital signature; encryption is handled by cryptographic techniques like symmetric or asymmetric encryption. Option B (Provide confidentiality) is incorrect because digital signatures ensure authenticity and integrity, while confidentiality is typically achieved through encryption. Option D (Generate symmetric keys) is incorrect since symmetric key generation is not related to the digital signature process. Option E (Enable anonymous communication) is incorrect because digital signatures are used to authenticate the sender, not enable anonymity.