OpenSSH 7.5 发布了，该版本主要是一个 Bug 修复版本。
但本次更细使得特权分离的使用是强制性的，并且删除对旧的、不支持的 OpenSSL 版本的支持。
In the next major release (expected June-August), removing remaining support for the SSH v.1 protocol (currently client-only and compile-time disabled).
In the same release, removing support for Blowfish and RC4 ciphers and the RIPE-MD160 HMAC. (These are currently run-time disabled).
In the same release, removing the remaining CBC ciphers from being offered by default in the client (These have not been offered in sshd by default for several years).
Refusing all RSA keys smaller than 1024 bits (the current minimum is 768 bits)