security/dhbitty 20120806 NetBSD

dhbitty is a small public key encryption program written in C. It uses elliptic curve Diffie-Hellman in the form of Curve25519 to establish a shared secret between two users, and uses that secret to symmetrically encrypt and authenticate messages.

There are no private key files; only passphrases. Never lose that pesky thing again.

Both the sender and the receiver can decrypt a message. In fact, there is no distinction between sender and receiver. Both passphrases must be strong.

There is no signing. A similarly useful form of authentication occurs using only DH. dhbitty attempts to be as simple as possible. It is not optimized, but achieves a comfortable speed for most uses. It does not use floating point numbers, or integers longer than 32 bits. It does not contain more algorithms than are needed.