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Research on Non-repudiation service

Research on Non-repudiation service. By Yi Zhang. Motivation of Non-repudiation. In paper-based business Electronic business transactions Less physical evidence The availability of sophisticated technologies

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Research on Non-repudiation service

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  1. Research on Non-repudiation service By Yi Zhang

  2. Motivation of Non-repudiation • In paper-based business • Electronic business transactions • Less physical evidence • The availability of sophisticated technologies • Parties potentially involved in a dispute should be able to obtain sufficient evidence to establish what had actually happened

  3. What is non-repudiation • The goal of a non-repudiation service • Digital signature is vulnerable to replay attacks • Sender authentication does not guarantee that messages were not modified • Non-repudiation service requires both

  4. NRD Sender Receiver NRO NRS NRR Model of Non-Repudiation Direct Transmission

  5. Delivery authority NRD Sender Receiver NRO NRS NRR Model of Non-Repudiation Indirect Transmission

  6. Technology Overview • Message Authentication • Message Authentication Code (MAC) • Digital Signature • Sender/Receiver Authentication • Username and Password • SSL Server and Client

  7. Technology Overview • SOAP (Simple Object Access Protocol) • XML based protocol • An envelope • A set of encoding rules • A convention for representing remote procedure calls and responses • A simple SOAP sample • SOAP-DSIG appends digital signatures to SOAP

  8. Request Example • HTML Header followed by SOAP message. POST /order HTTP/1.1 Host: www.onlinetrade.com Content-Type: text/xml; charset="UTF-8" Content-Length: nnnn SOAPAction: "http://www.onlinetrade.com/order#buy“ …… SOAP message

  9. Response Example HTTP/1.1 200 OK Content-Type: text/xml; charset="UTF-8" Content-Length: nnnn …… SOAP message

  10. Satisfaction of Non-repudiation service • Exchanging the above HTTP messages over SSL. • To guarantee the signer of a SOAP message is the same as the sender • The private key used to sign the order should be the same for SSL client authentication. • The private key used to sign the receipt should be the same for SSL server authentication

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