Digital Signatures
Las digital signatures usan asymmetric cryptography para autenticar el sender de un message o signer de un document, asegurando integrity y non-repudiation.
Las digital signatures se basan en asymmetric cryptography, usando un key pair: un private key para signing y un public key para verification. El signer hashea el message, firma el hash con el private key, y adjunta la signature al message. El recipient verifica desencriptando la signature con el public key del sender y comparando con un fresh hash del message. Algoritmos comunes incluyen RSA, DSA, y ECDSA; la práctica moderna también usa EdDSA (e.g., Ed25519). La security depende de que el private key permanezca confidential y la hash [function](/es/terms/hash-function) resista collisions. En PKI deployments, los public keys se enlazan a identities vía certificates emitidos por trusted authorities. Vulnerabilidades potenciales incluyen weak keys, compromised keys, hash-function weaknesses, side-channel leakage, y implementation flaws. Las best practices incluyen robust key management, certificate lifecycle handling, y la selección de algoritmos con 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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❓ Preguntas frecuentes
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.