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Yes, if you are using 3rd party key exchange, the 3rd party can read the messages. If that is not the security feature you want, use something else. There are many legitimate scenarios where users are fine with trusting the third party, however. For example, a system setup by my employer to allow encrypted chat between myself and our clients. My employer has ...


3

I have never heard of this reason, and I don't quite understand it. In general, the security of Diffie-Hellman key exchange is reduced to the DDH assumption. According to this assumption, the result of the key exchange is a group element that is computationally indistinguishable from a random/uniformly distributed element in the group. However, what is ...


0

To show that the protocol is secure under DDH, we need a reduction $R$ that takes a triple as input and outputs a transcript and key such that if the triple is a DDH triple, then the transcript and key are distributed identically to a real execution of the protocol if the triple is random, then the transcript and key are distributed as if you ran a real ...



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