Optimized Certificates A New Proposal for Efficient Electronic Document Signature Validation
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1 Optimized Certificates A New Proposal for Efficient Electronic Document Signature Validation Martín Augusto G. Vigil Ricardo Felipe Custódio Joni da Silva Fraga Juliano Romani Fernando Carlos Pereira Federal University of Santa Catarina/Brazil EuroPKI'08 Fifth European PKI Workshop
2 Outline About the speaker Signed documents issues Solutions approaches Optimized Certificate's approach Optimized PKI Optimized Certificate Format Considerations Future work Questions
3 About the speaker Martín Augusto Gagliotti Vigil MSc student at Federal University of Santa Catarina - Brazil Computer Security Lab (aka LabSEC) João de Barro: development of a hardware (HSM) and software solution to support the federal Brazilian PKI (aka ICP-Brasil) Electronic documents management ICPEDU: development of a PKI for universities and research centers Optimized Certificate Certification Authority
4 Signed documents issues What information will be included in a signed document in order to validate it? As little as possible and performing external queries to acquire missing data when validating a signature All necessary data to validate a signature What else is required? Trusted Root CA Certificate
5 Using external queries approach Directory Signer Verifiers OCSP
6 Embedding everything Doc Doc Sig TS CC RR Sig TS Root CA CA 2 CA 5 U 1 CRL 1 Doc Sig Root CA CA 2 TSA 1 CRL 1 CRL 2 CRLs often become long CRL 2 CRL 3
7 Solution Approaches One could use short term certificates (Rivest 1998) Certificates do not need to be revoked CRLs are dismissed Drawback in this approach Overhead in renewing users certificates Generation of a cryptographic key pair Generation of a X509 certificate
8 Optimized Certificate (OC) Aiming at reducing embedded data in a signed document Short term certificate: issuance and expiration date are equal CRL checking for OC is dismissed Signed document's time-stamp is dismissed Micali's Novomodo validity proof into OCs CRL checking for OC's issuer is dismissed Fast revocation checking: hash evaluation
9 Validation Effort Finding out a certification path Validating each certificate High cost: revocation status checking Checking policies Root CA CRL 1 CRL 2 CA 1 CA 2 CRL 3 CA 3 CA 4 CA 5 CA 6 U 1
10 Optimized Certificate (OC) Doc Sig TS Root CA CA 1 CA 3 U 1 CRL 1 CRL 2 CRL 3 Doc Sig OC OCCA Root CA CRL 1 Signed Doc with an Optimized Certificate Traditional Signed Doc
11 OC and Signed Documents OC carries traditional certificate's information and some extra extensions Optimized certificate issued for a document OC linked to a document's hash code OC can work as a document time-stamp Implemented using a X509 extension Digest algorithm OID and hash value
12 OC Certification Authority (OCCA) Validates doc signature, certificate chain and time-stamp OCCA Signer or Verifier
13 OCCA and its PKI level Aiming validation performance Short certification path CRL 1 Root CA CRL 2 CA 2 OCCA 1 CRL 3 CA 5 CA 6 U oc1 U oc2 U 1
14 OC and its Validation Short term certificate Beginning and ending of validity are equal X509 standard is not changed Revocation is not needed for an OC
15 OCCA's certificate and its Validation OCCA certificate validation engages Micali's Novomodo Novomodo's proof of OCCA validity embedded in issued OCs deploying a X509 extension X509 standard is not changed High performance: hash function evaluations
16 Optimized PKI Security OCCA requests its validity proofs to Root CA OCCA issues OCs until its validity proof expires In order to issue OCs an attacker needs OCCA's private key and novomodo secret values owned by Root CA Root CA is supposed to be offline
17 OC Interpretation Signer can request an OC for a signed document OC date and time should be understood as the time when the signature was created OC date and time can be accepted as proof of document's existence at that time OCCA asks signer key ownership proof
18 OC Interpretation Also a verifier can request an OC for a thirdparty signed document OC's date and time is the moment of OC's request OC's date and time is defined by verifier OC's date and time correspond to document's signature time-stamp Interpretation flags are embedded in issued OCs deploying a X509 extension
19 OC and X509 Version Serial Signature Algorithm Issuer Validity NotBefore = NotAfter Subject Subject Public Key Info Extensions Document's hash code Micali's novomodo proof OC's meaning flag Signature
20 Considerations Optimal document representation No external consult needed to validate an OC Low costs of certificate validation and storage Suitable to environments of limited in energy, bandwidth and memory Improve the efficiency of mass on-line transactions Overhead in traditional certificate validation by OCCA
21 Future Work Formal analysis of OCCA's protocols Design and implement a prototype of an OCCA Embedding OCCA in our HSM Network
22 Questions? Ricardo Felipe Custódio - custodio@inf.ufsc.br Martín Augusto G. Vigil - vigil@inf.ufsc.br
23 Further information OCCA's project website LabSEC's related projects
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