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E-mail is great, but it has many problems. Did you know that it is very easy to send messages that appear to be from other people? Spammers do this all the time in an effort to encourage you to open their mail. The big problem with e-mail is the absolute lack of security.
There are two parts to security - authentication and encryption:
Authentication is checking that the message is really from the person that it claims to be from. Was is really your bank that sent you that message about your account being suspended?
Encryption is scrambling the message contents so that it cannot be read in transit. This is often compared to the postcard vs. sealed envelope for mail.
The problem with securing e-mail is that it relies on both parties having the desire and the software in order to participate. I cannot simply send an encrypted e-mail to my accountant if she does not have compatible software - and I would need her credentials (public key) in advance. Read more…

