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X.509 Certificate Decoder

Parse and analyze X.509 certificates

PEM Certificate

Paste a PEM-encoded certificate to decode

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About X.509 Certificates

  • •ITU-T X.509 standard defines the format for public key certificates
  • •PEM format is Base64-encoded DER with header/footer lines
  • •Contains subject, issuer, validity period, and public key info
  • •Self-signed certificates have subject = issuer

X.509 in IAM

  • •SAML Signing – Sign and verify SAML assertions
  • •mTLS – Client certificate authentication
  • •JWT RS256/ES256 – Asymmetric token signing
  • •TLS/HTTPS – Secure transport encryption