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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 ...


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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 ...


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Some background on formal key-exchange models The goal of a key-exchange (KE) is to establish a session key between two parties. Naively, we could say that a KE is secure if no adversary will be able to figure out the session key (in full) established between two honest parties. However, in formal security models we take this a bit further and insist that ...



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