red25519 is a Ruby wrapper for the Ed25519 public key digital signature
system created by Dan Bernstein:

https://github.com/tarcieri/red25519

Ed25519 provides much shorter keys (32-bytes) and signatures (64-bytes)
than alternatives like DSA while still providing a 128-bit security level.
Unlike ECDSA (and DSA), Ed25519 is deterministic and does not rely upon an
entropy source when signing messages.

This is the initial public release of red25519. If you're looking for a
public key digital signature algorithm to use in Ruby, Ed25519 is probably
your best choice.

-- 
Tony Arcieri