SSH uses asymmetric cryptography to establish a shared secret key and then symmetric cryptography for bulk encryption with that key. Asymmetric encryption, on the other hand, doesn’t require a shared secret key but is less efficient. Symmetric cryptography, like the Advanced Encryption Standard (AES), is faster and more efficient for bulk encryption, but it requires a shared secret key. To accomplish its goals, SSH uses two different types of cryptography. As shown, packets associated with the session are filtered using the built-in ssh filter.
The screenshot above shows a sample SSH session in Wireshark. The way that SSH accomplishes this is very similar to SSL/TLS, which is used for encryption of web traffic (HTTPS) and other protocols without built-in encryption. The main difference between SSH and Telnet is that SSH provides a fully encrypted and authenticated session.
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