SPAKE2 Password-Authenticated Key Exchange

The `spake2` library is a pure-Python implementation of the SPAKE2 password-authenticated key exchange (PAKE) algorithm. It enables two parties sharing a weak password to securely derive a strong shared secret over an insecure channel, preventing passive eavesdropping and limiting active attackers to a single password guess per protocol execution. The current stable version is 0.9, released in September 2024, with an infrequent release cadence.