The regime in Tehran has long insisted that the programme is for civilian purposes and it has no intention of making a nuclear weapon. However, since two undeclared sites, for uranium enrichment and heavy water plutonium production, were discovered in 2002, the programme has been treated with intense suspicion.
Apps and platforms like Signal, iMessage, and WhatsApp all provide end-to-end encryption, but it's not that straightforward — and the technology's backdoors and compliance with authorities can lead to major problems.，更多细节参见PDF资料
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Фото: Yoan Valat / Pool / Reuters