That's very sad and AFAIK startling - he was still relatively young. I remember him being very friendly as a faculty member at CMU, as well as being whip-smart.

That's very sad and AFAIK startling - he was still relatively young. I remember him being very friendly as a faculty member at CMU, as well as being whip-smart. It is interesting that "Why Johnny Can't Encrypt" is the paper that appears in his obit link. This was coauthored with his student Alma Whitten (who later went on to the thankless task of being the main flak-catcher for Google on privacy issues, including what looked like some uncomfortable grillings on Capitol Hill).