Encrypted email - too hard?

Special delivery - secure email is a presentation by Fred Avolio of BAESYSTEMS about encrypted email, from a conference a year ago. It outlines the process of symmetric and asymmetric encryption used for secure message and key exchange, respectively, and briefly mentions the main options available for secure email. The big question remains: why do so few people use email encryption? Is it just ‘too hard’? Hushmail is one easy option - it's an encrypted webmail system. Just point and click!
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