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Signal's X3DH Protocol - what is Alice's ephemeral key? Is the previous ephemeral key used in the next message's run? Are one-time prekeys signed?

In the Signal Protocol and X3DH Protocol: https://signal.org/docs/specifications/x3dh/ I have a few questions: 1. In section 3.3. "Sending the initial message", it says: Alice verifies the ...
sudoExclamationExclamation's user avatar
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What attacks does future secrecy protect against?

Consider messaging between 2 parties. A sequence of messages are exchanged between the parties using encryption. We consider an attacker that has at a minimum a log of all the (encrypted) messages ...
river's user avatar
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3 votes
3 answers
258 views

DIY message level security?

This might be in danger of being too elementary a question for this community but I'm hoping for expert help: Assuming that TLS is not enough to protect messages transmitted between a client and a ...
Matthew's user avatar
  • 139
2 votes
2 answers
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Initializing PGP keys by one side

I am using a PGP method to encrypt and decrypt messages shared between users A and B. Upon the start of a message exchange is the initialization of the public and secret keys by both Users. Lets say ...
WJA's user avatar
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