USOO8943 201B2 (12) United States Patent (10) Patent No.: US 8,943,201 B2 Larson et al. (45) Date of Patent: Jan. 27, 2015 (54) METHOD FORESTABLISHING ENCRYPTED (58) Field of Classification Search CHANNEL USPC .......................................... 709/225 229, 245 See application file for complete search history. (75) Inventors: Victor Larson, Fairfax, VA (US); Robert Dunham Short, Leesburg, VA (56) References Cited (US); Edmund Colby Munger, Crownsville, MD (US); Michael U.S. PATENT DOCUMENTS Williamson, South Riding, VA (US) 2,895,502 A 7/1959 Roper et al. 4.405,829 A 9, 1983 RiveSt (73) Assignee: VirnetX, Inc., Zephyr Cove, NV (US) (Continued) (*) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 FOREIGN PATENT DOCUMENTS U.S.C. 154(b) by 0 days. DE 1992.4575 12/1999 EP O838.930 4f1988 (21) Appl. No.: 13/285,962 (Continued) (22) Filed: Oct. 31, 2011 OTHER PUBLICATIONS (65) Prior Publication Data Exhibit G, Opening Expert Report of Dr. Stuart Stubblebine Regard ing Invalidity of the 135,211, and 504 Patents. US 2012/OO4208.6 A1 Feb. 16, 2012 (Continued) Related U.S. Application Data Primary Examiner — Krisna Lim (60) Continuation of application No. 1 1/679,416, filed on (74) Attorney, Agent, or Firm — McDermott, Will & Emery Feb. 27, 2007, now Pat. No. 8,051,181, which is a continuation of application No. 10/702,486, filed on (57) ABSTRACT Nov. 7, 2003, now Pat. No. 7,188,180, which is a A technique is disclosed for establishing a secure communi cation link between a first computer and a second computer (Continued) over a computer network. Initially, a secure communication mode of communication is enabledata first computer without (51) Int. C. a user entering any cryptographic information for establish G06F 5/73 (2006.01) ing the secure communication mode of communication. H04L 29/06 (2006.01) Then, a secure communication link is established between the (Continued) first computer and a second computer over a computer net (52) U.S. C. work based on the enabled secure communication mode of CPC ............ H04L 45/00 (2013.01); H04L 63/0428 communication. The secure communication link is a virtual (2013.01); H04L 29/12801 (2013.01); H04L private network communication link over the computer net 61/15 (2013.01); H04L 63/1458 (2013.01); work in which one or more data values that vary according to H04L 61/35 (2013.01); H04L 45/24 (2013.01); a pseudo-random sequence are inserted into each data packet. (Continued) 31 Claims, 40 Drawing Sheets 3. 32 S8i secPCRYO) S8:E Ristic R86. 8 & 3. 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