File Server: Added ServerSession.Cipher property to make it possible to determine SSH ciphers used by each session.
File Server: Added support for AEAD encryption ciphers ('aes128-gcm@openssh.com', 'aes256-gcm@openssh.com' and 'chacha20-poly1305@openssh.com').
File Server: Added support for encrypt-then-MAC ciphers ('hmac-sha2-256-etm@openssh.com' and 'hmac-sha2-512-etm@openssh.com').
File Server: Enhanced handling of 'pty-req' and 'window-change' SSH channel requests - wrong values are rejected.
File Server: Enhanced ShellModule class to make it possible to implement custom SSH subsystems.
File Server: Virtual shell now treats the line-feed character as end-of-line indicator in addition to carriage-return character.
SSH: Added new properties to SshCipher to make it possible to determine IDs of active ciphers.
SSH: Added workaround for a weakness in legacy CBC ciphers.
TLS Core: Enhanced TlsSocket.Timeout property to apply to subsequent Send, SendAsync, Receive and ReceiveAsync methods even when TLS is already active.
TLS Core: Improved and unified behavior of the TlsSocket Shutdown/ShutdownAsync methods when negotiation has not been started.
TLS Core: Improved TLS exception reporting.
TLS Core: Logging improvements.
TLS Core: Optimizations in TLS 1.3 internals.
TLS Core: Support for the TLS 1.3 record with empty application data payload and random padding.
TLS Core: Unified TlsSocket.Cipher property behavior across TLS versions.