Secure Communications – Telnet vs SSH

Telnet is an older protocol that uses unsecure plaintext transmission between the communicating devices

Example of Wireshark capturing a Telnet Username/Password pair

SSH (Secure Shell) is a secure protocol that encrypts the transmission between the communicating devices

https://www.infosecmatter.com/capture-passwords-using-wireshark/#capture-telnet-password

Example of Wireshark result when SSH is used