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TLS Extensions – iSaSiLk Contents 1 INTRODUCTION................................................................................................................................5 2 TLS EXTENSIONS .............................................................................................................................6 3 INSTALLATION .................................................................................................................................7 4 TLS EXTENSIONS AND ISASILK...................................................................................................9 4.1 THE ISASILK EXTENSION FRAMEWORK .........................................................................................9 4.2 ISASILK EXTENSION SURVEY ......................................................................................................13 4.2.1 Server Name Indication .........................................................................................................13 4.2.2 Maximum Fragment Length Negotiation ...............................................................................17 4.2.3 Client Certificate URLs .........................................................................................................19 4.2.4 Trusted CA Indication............................................................................................................23 4.2.5 Truncated HMAC ..................................................................................................................26 4.2.6 Certificate Status Request ......................................................................................................27 5 ACRONYMS ......................................................................................................................................33 6 REFERENCES ...................................................................................................................................34 Stiftung SIC – http://jce.iaik.tugraz.at 3