Method and apparatus for digitally signing electronic mail that originates ...

(12) Ullitfild States Patent (10) Patent No.: US 7,945,782 B2

Philips et al. (45) Date of Patent: *May 17, 2011

U.S. Patent May 17,2011 Sheet 2 of3 US 7,945,782 B2

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FIG. 4