At the receiving end, CoverDrop’s secure servers remove an initial layer of encryption to filter out real messages from the cover messages. These are then provided to journalists via a dead drop delivery system, which pads the still-encrypted real messages with some cover messages to ensure the drops are always the same size. In the event a dead drop contains a message for a given journalist, they can decrypt it since it was encrypted with their public key in the first place. Since the messages also include the source’s public key, replies can be sent in the reverse fashion in a similarly secure way.
Фото: Dursun Aydemir / Anadolu via Getty Images
，这一点在搜狗输入法中也有详细论述
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