Understanding HTTPS CRL and OCSP
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1 Understanding HTTPS CRL and OCSP Santhosh J PKI Body of Knowledge: Development & Dissemination Centre for Development of Advanced Computing (C-DAC) Bangalore Under the Aegis of Controller of Certifying Authorities (CCA) Government of India
2 Understanding HTTPS Step: 1 Client requests secure session Step 2: - Server responds with a certificate Server Client
3 Understanding HTTPS Client validates Server s Certificate Client Step 3: Verifies CA s digital signature To ensure Server certificate is valid & not tampered. CA Public Key
4 Understanding HTTPS Step 3: - Client creates symmetric key and encrypts it with public key Server Step 4: - Encrypted symmetric key sent to the server UcaNPA$$ Client Step 5: - Server decrypts symmetric key with private key
5 Understanding HTTPS Step 6: -The session is encrypted with the session key using symmetric encryption Server Client
6 Some real world examples GBC UOH Hyderabad C-DAC, Bangalore Tuesday, Nov 23, 2010
7 SSL : Site security certificate Web browser doesn t trust the server certificate
8 SSL : Site security certificate Web browser Trusts the certificate issued to icicibank.com
9 CRL What is revocation? Why do we need it? What is currently being done?
10 Why Revoke? Key Compromise Forgotten Passphrase Lost Private Key
11 CRL CRL is a periodically issued list of digital signature certificates that have been suspended or revoked prior to their expiration dates. It is digitally signed by Certifying Authority.
12 Current Standard Certificate Revocation Lists (CRLs) Serial Numbers Revocation Date Effective Date Next Update Date CA Signed Should Be Publically Available.
13 Obtaining CRLs
14 CRLs
15 Checking status with CRL CDP CRL Distribution Point
16 What are the problems CRL does not provide timely information regarding revocation status of a digital certificate. Every time end user have to download CRL and import it in the browser or in other certificate repository for checking status of digital certificate. If serial number of digital certificate is not present in CRL then we simply trust that certificate.
17 Online Certificate Status Protocol Online certificate status protocol(ocsp) is an internet protocol used for obtaining the revocation status of an X.509 digital certificate. It was created as an alternative to certificate revocation list It gives status of certificate in real time.
18 Checking status with OCSP
19 OCSP Services The OCSP protocol enables OCSP-compliant applications to determine the state of a certificate, including revocation status. The validation authority which validates the status of certificate known as OCSP responder. CA periodically publishes CRLs to an OCSP responder. The OCSP responder maintains the CRL it receives from the CA.
20 Contd. When end user wants to know about status of a digital certificate then he/she can send query to OCSP responder. The OCSP responder determines if the request contains all the information required to process the request sent by user. If it does not or if it is not enabled for the request service, a rejection notice is sent. If it does have enough information, it processes the request and sends back a report stating the status of the certificate. C-DAC, Bangalore
21 OCSP - Response OCSP responses are of 3 types & all response messages will be digitally signed. Good Indicates that the certificate is not revoked, but does not indicate that certificate was ever issued or time at which response produced is within the certificate s validity interval. Revoked Indicates that the certificate has been revoked. Unknown Indicates that the responder doesn t know about the certificate being requested.
22 OCSP Exception/Error Messages Error messages are not signed. Error are of following types: Malformed Request When request received does not conform to the OCSP syntax. Internal Error Due to inconsistent internal state. Try Later When OCSP is unable to return a status for requested certificate. SigRequired When server requires the client sign the request in order to construct a response. Unauthorized When client is not authorized to make this query to the server.
23 References Cryptography and Network Security - Atu Kahate
24 Thank You
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