Master the 2025 CRISC Challenge – Grab Your Risk Control Superpowers!

The primary function of a digital signature is to verify message integrity and authenticity. When a sender signs a message with their private key, it creates a unique signature that is mathematically linked to both the content of the message and the private key used for the signing. This enables the recipient to confirm that the message has not been altered in transit and that it indeed originates from the claimed sender, as only the sender possesses the corresponding private key that produces a valid signature.

Digital signatures also serve a critical role in non-repudiation, meaning that the sender cannot deny having sent the message once it is signed. It assures the recipient that they can trust the origin of the message. While some aspects of other answer choices, like encryption and confidentiality, play important roles in data security, the essence of a digital signature is centered around ensuring both the integrity and the authenticity of a message rather than altering its confidentiality or facilitating key exchanges.