It's pretty funny that "position-based quantum cryptography" basically emulates the functionality we had before communications technology. You know, like, writing shit down.
If the US government ever decides to truly serious about WikiLeaks, Julian Assange will break long before the 256-bit AES encryption of the "Insurance" file will.
The notion of "deniable encryption" was introduced by Julian Assange & Ralf Weinmann in the Rubberhose filesystem and explored in detail in a paper by Ran Canetti, Cynthia Dwork, Moni Naor, and Rafail Ostrovsky in 1996.
All entities can perform arbitrary quantum (and classical) operations and can communicate quantum (and classical) messages among them. For simplicity, we assume that quantum operations and communication is noise-free; however, our results generalize to the more realistic noisy case, assuming that the noise is low enough. We require that the verifiers have a private and authentic channel among themselves, which allows them to coordinate their actions by communicating before, during or after protocol execution. [...] we assume that messages to be communicated travel with the speed of light [...] We assume on the other hand that local computations take no time. [...] Finally, we assume that the verifiers have precise and synchronized clocks [...] However, we do assume that P’s clock only runs forward (i.e. P cannot be reset).
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