Secure vs. Insecure protocols


The protocol is a set of rules that determine how data is transmitted.

As regards sniffing, there are secure protocols and insecure protocols.

Secure protocols provide authenticity, integrity and confidentiality.

Insecure protocols are vulnerable to passive sniffing, whereas secure protocols use strong encryption.
That means that if an attacker captures e.g. IPSEC traffic it won't see any important data as plaintext because of encryption.
Even secure protocols are not always reliable, by performing various network attacks some of them may be cracked, e.g. SSL or SSH.

Insecure protocols: HTTP, FTP, Telnet, SNMP v1/2 etc.
Secure protocols: HTTPS (HTTP + SSL/TLS), SFTP, SSH, SNMP v3, IPSEC.





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