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OTR and XMPP
- 1. OTR and XMPP
- 2. XMPP • Almost 10 years old • IETF standard (RFC 3920 RFC 3921) • More than 100 extensions • Started as Jabber: XMPP is the protocol powering Jabber Instant Messaging Network
- 3. Who’s using XMPP • GTalk, Facebook (not completely implemented) • Jabber.TLD • Yahoo! (the Video conference site) • AIM (private interconnects) • US DoD (big BIG users), UK Armed Forces bla..bla...
- 4. What’s XMPP • XML Streams: send small XML messages • Simple building blocks • Extensible: add your stuff, no need to ask permission • Federated
- 5. Guess what’s in your record? <message to='romeo@example.net' from='juliet@example.com' type='chat' xml:lang='en'> <body>Wherefore art thou, Romeo?</body> <body xml:lang='cz'>PročeŽ jsi ty, Romeo?</body> </message>
- 8. OTR brings... • Forward secrecy short-live key for messaging long-term key for authentication • Repudiable authentication - forgeability do not want digital signatures do want authentication
- 9. Socialist millionaire In cryptography, the socialist millionaire problem is one in which two millionaires want to determine if their wealth is equal without disclosing any information about their riches to each other.