No, not all SSH Servers are secure. SSH is a protocol that uses various encryption ciphers, and the security of SSH is highly dependent on the encryption cyphers used. An SSH Server is only as secure as the encryption methods it uses. When SSH first came out, its algorithms were state of the art. Unfortunately, thanks to significant increases in computer power and advances in decryption techniques, the majority of the original SSH algorithms are no longer secure. For this reason, not all SSH products and implementations are equally secure. Some still use the original algorithms, which are simply outdated, dangerous to use and unfit for commercial deployment.
Make sure that the SSH Server that you download:
1. Uses the most current, up-to-date ciphers that have no known security vulnerabilities or weakness.
2. Provides complete end-to-end security. You want to make sure that all of the data is encrypted before leaving the client or leaving the server.
Georgia SoftWorks maintains the most updated, current and safe algorithms available on the commercial market.