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In the asymmetric encryption context I think something can be done in this direction with a double trapdoor function. I studied few examples of them in the past and briefly you can build up an encryption scheme with a "local" trapdoor and a "global" one. If you keep the secret for the global trapdoor for you you'll have a sort of escrow key allowing you to ...


It may looks like off-topic. But there exist hardware solution today. In the early years, both Soviet and USA used reverse engineering to get the scheme of crypto-system. Military standards today are too closed. What we use called a civil standard, and it is open. So reverse engineering seems unnecessary. There is such technology: ...

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