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.
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