Cryptography
cryptography
security
authentication
What is Digital Signature?
Definition
A digital signature is a cryptographic proof that a message or document was created by a specific sender and has not been altered. It uses the sender's private key to sign and the public key to verify.
Why It Matters
Digital signatures authenticate software updates, sign Git commits, validate API requests, and prove document authorship in legal and financial systems. They provide non-repudiation — the signer cannot deny having signed.