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Digital Signature Verifier

Create and verify digital signatures using RSA or ECDSA. Digital signatures ensure data integrity and authenticate the sender.

Mode

Algorithm

Sign Message

About Digital Signatures

Digital signatures use public key cryptography to verify the authenticity and integrity of digital messages or documents. They provide non-repudiation, ensuring the sender cannot deny having sent the message.

How It Works

  • Signing: Hash the message, encrypt hash with private key
  • Verification: Hash the message, decrypt signature with public key, compare
  • Security: Only private key holder can create valid signatures
  • Integrity: Any message modification invalidates the signature

Use Cases

  • Code Signing: Verify software authenticity
  • Email Security: S/MIME and PGP signatures
  • Document Signing: PDF digital signatures
  • Blockchain: Transaction authentication
Algorithm Comparison:
  • RSA-PSS: Modern, provably secure, recommended for new applications
  • RSA-PKCS1: Widely compatible, legacy support
  • ECDSA: Smaller keys, faster, same security level as RSA

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