- Security fix: on Windows, a server could DoS the whole Windows GUI
by telling the PuTTY window to change its title repeatedly at high
speed.
- Pageant now supports loading a key still encrypted, and decrypting
it later by prompting for the passphrase on first use.
- Upgraded default SSH key fingerprint format to OpenSSH-style SHA-256.
- Upgraded private key file format to PPK3, with improved passphrase
hashing and no use of SHA-1.
- Terminal now supports ESC [ 9 m for strikethrough text.
- New protocols: bare ssh-connection layer for use over
already-secure IPC channels, and SUPDUP for talking to very old
systems such as PDP-10s.
- PuTTYgen now supports alternative provable-prime generation
algorithm for RSA and DSA.
- The Unix tools can now connect directly to a Unix-domain socket.
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