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2021-12-03		2022-06-16
5.20 Bug 1984: SSH core upgraded to PuTTY 0.76 – Support Curve448 key exchange method + Support Ed448 user and host keys + Bug 1952: Support rsa-sha2-256 and rsa-sha2-512 SSH public key algorithms (martin)		5.21 stable released (martin)
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	* Compression formats: zlib, zlib@openssh.com, none		* Compression formats: zlib, zlib@openssh.com, none

-	* Key exchange protocols: curve448-sha512 //(latest beta version only)//, &beta curve25519-sha256, curve25519-sha256@libssh.org, ecdh-sha2-nistp256, ecdh-sha2-nistp384, ecdh-sha2-nistp521, diffie-hellman-group-exchange-sha256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha256, diffie-hellman-group14-sha1, rsa2048-sha256, rsa1024-sha1, diffie-hellman-group1-sha1	+	* Key exchange protocols: curve448-sha512, curve25519-sha256, curve25519-sha256@libssh.org, ecdh-sha2-nistp256, ecdh-sha2-nistp384, ecdh-sha2-nistp521, diffie-hellman-group-exchange-sha256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha256, diffie-hellman-group14-sha1, rsa2048-sha256, rsa1024-sha1, diffie-hellman-group1-sha1

-	* Hostkey formats: ssh-ed25519, ssh-ed448 //(latest beta version only)//, &beta ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521, rsa-sha2-512 //(beta only)//, &beta rsa-sha2-256 //(beta only)//, &beta ssh-rsa, ssh-dss	+	* Hostkey formats: ssh-ed25519, ssh-ed448, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521, rsa-sha2-512, rsa-sha2-256, ssh-rsa, ssh-dss

	* Message authentication codes (MACs): hmac-sha2-256 (hmac-sha2-256-etm@openssh.com), hmac-sha1 (hmac-sha1-etm@openssh.com), hmac-sha1-96 (hmac-sha1-96-etm@openssh.com), hmac-md5 (hmac-md5-etm@openssh.com)		* Message authentication codes (MACs): hmac-sha2-256 (hmac-sha2-256-etm@openssh.com), hmac-sha1 (hmac-sha1-etm@openssh.com), hmac-sha1-96 (hmac-sha1-96-etm@openssh.com), hmac-md5 (hmac-md5-etm@openssh.com)