Wireshark packet capture analysis2/16/2023 ![]() As a result, it can be used for a variety of different purposes, including credential-stuffing attacks, scanning for machines running vulnerable SSH servers and establishing reverse shells. ![]() It enables remote, encrypted access to any system running an SSH server. ![]() SSH protocol analysis for incident response While this dates the capture (MD5 is deprecated), it shows how SSH works and looks in Wireshark. This SSH session will be using AES-128 in Counter mode for encryption with an HMAC based upon MD5 to ensure message integrity. The use of asymmetric cryptography is shown in the screenshot above as Diffie-Hellman is a protocol for secure key generation.ĭiving into packet 21, as shown above, we see the use of symmetric cryptography as well. 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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