Digital Signatures
Digital signatures use asymmetric cryptography to authenticate the sender of a message or signer of a document, ensuring integrity and non-repudiation.
Digital signatures are based on asymmetric cryptography, using a key pair: a private key for signing and a public key for verification. The signer hashes the message, signs the hash with the private key, and appends the signature to the message. The recipient verifies by decrypting the signature with the sender's public key and comparing to a fresh hash of the message. Common algorithms include RSA, DSA, and ECDSA; modern practice also uses EdDSA (e.g., Ed25519). Security relies on the private key remaining confidential and the hash [function](/ru/terms/hash-function) resisting collisions. In PKI deployments, public keys bind to identities via certificates issued by trusted authorities. Potential vulnerabilities include weak keys, compromised keys, hash-function weaknesses, side-channel leakage, and implementation flaws. Best practices include robust key management, certificate lifecycle handling, and selecting algorithms with adequate security margins.
graph LR
Center["Digital Signatures"]:::main
Rel_digital_asset_security["digital-asset-security"]:::related -.-> Center
click Rel_digital_asset_security "/terms/digital-asset-security"
Rel_digital_forensics["digital-forensics"]:::related -.-> Center
click Rel_digital_forensics "/terms/digital-forensics"
Rel_digital_certificate_management["digital-certificate-management"]:::related -.-> Center
click Rel_digital_certificate_management "/terms/digital-certificate-management"
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What is the purpose of a digital signature?
To authenticate the signer, ensure message integrity, and provide non-repudiation.
Which algorithms are commonly used for signing?
RSA, DSA, ECDSA; EdDSA (e.g., Ed25519) is widely adopted in modern systems.
How is a digital signature created?
Hash the message and sign the hash with the private key; attach the signature.
How is a digital signature verified?
Decrypt the signature with the public key and compare to a hash of the message.
What are common vulnerabilities?
Weak private keys, compromised keys, weak hash functions, side-channel attacks, and faulty implementations.
What is PKI and why is it important?
PKI binds public keys to identities through certificates issued by trusted authorities, enabling trust.