SAML Security: Digital Signatures, Encryption, and X.509 Certificate Verification
Visual Overview: sequenceDiagram participant User participant SP as Service Provider participant IdP as Identity Provider User->>SP: 1. Access Protected Resource SP->>User: 2. Redirect to IdP (SAML Request) User->>IdP: 3. SAML AuthnRequest IdP->>User: 4. Login Page User->>IdP: 5. Authenticate IdP->>User: 6. SAML Response (Assertion) User->>SP: 7. POST SAML Response SP->>SP: 8. Validate Assertion SP->>User: 9. Grant Access Security Assertion Markup Language (SAML) employs robust security mechanisms to ensure secure identity federation. This post examines SAML’s cryptographic foundations, focusing on XML Digital Signatures, XML Encryption, X.509 certificate verification, and defenses against replay attacks. ...