[Friday_]

Encryption is only for protecting message content.

Nobody said that encryption will save you from enemy knowing who you are, where you are, who you talking to, etc.

[jacquesm]

And often that is just as valuable as the actual message content, if not more valuable because it allows for network analysis.

[ChuckNorris89]

>it allows for network analysis

Like Nazis always ending their encrypted communications with 'Heil Hitler' making reversing the keys easier lol.

Although, for modern encrypted telecoms, I doubt this is as easy.

[jacquesm]

That's something else, that's known plaintext analysis using cribs. If you know that a certain text may be present in the messages then you can try a bunch of different keys and stop searching if your decrypt contains that text to inspect for a 'hit'.

Network analysis or traffic analysis is this:

https://en.wikipedia.org/wiki/Traffic_analysis

It allows for instance for the de-anonymization of network nodes based on known nodes and it allows for determining which nodes in the network are more important than others.