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A comment on ProtonMail Now Supports Bitcoin Payments. Parent comment

Re:ProtonMail Now Supports Bitcoin Payments by bartbutler on Thursday August 17, 2017 @12:43PM (#15038367)
It's a key escrow system. The admins hold a copy of the user's key, and promoting a new admin involves giving access to this key.
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Re:ProtonMail Now Supports Bitcoin Payments by ComodoHacker on Thursday August 17, 2017 @03:17PM (#15039934)
So where is this copy stored?
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Re:ProtonMail Now Supports Bitcoin Payments by ThePhysicist on Thursday August 17, 2017 @03:57PM (#15040290)
Interesting! You could probably do it by using the key of an existing admin to decrypt the escrow key and then reencrypt it with the public key of the new admin, all client-side.
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