How is network data being intercepted?

Question

Information Security

For example, there is a Diffie-Hellman algorithm that promotes secure data transfer between parties - this is understandable. It is not clear how this data is intercepted. For example, let's take the same Telegram, which works on the modernized Diffie-Hellman algorithm, how does the interception actually take place?

Answer 1

The "sniffing" tag is clearly superfluous here, the easiest way to intercept is to come to the Telegram authors and ask them for the keys. By the way, one of the claims of independent security professionals regarding the implementation of cryptography in Telegram is the actual lack of perfect forward secrecy (which means that previous communications can be decrypted if the keys are leaked).