Digital Signature
A digital signature is a cryptographic mechanism that provides authentication (verifying the signer's identity), integrity (proving the content hasn't been modified), and non-repudiation (the signer can't deny signing). It works by creating a hash of the document and encrypting it with the signer's private key — anyone can verify the signature using the signer's public key.
In the DoD, digital signatures are commonly created using certificates on a CAC card. Digitally signed emails and documents carry legal weight and provide stronger assurance than a typed name or scanned signature.
Why It Matters
Digital signatures support multiple CMMC requirements including authentication, integrity, and non-repudiation. Using CAC-based digital signatures for important documents and communications is a standard practice in DoD environments.