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Verifying the origin of emails is a difficult task. Public Key Infrastructure
encryption systems can do this, but until now they've been difficult to use for
non-technical users.
Ciphire Mail is a simple to use add-in for almost any email client that
verifies the identity of incoming mail from other Ciphire users, and encrypts
your outgoing mail so it can be similarly verified at the other end.
The program works transparently in the background to verify email signatures,
and the decryption and encryption is done by the client on your PC. You can
secure multiple email addresses, and it allows you to use an email address on
more than one PC.