[Cryptography] Atomic or simultaneous exchange of secrets.

[Alfie John]

On 3 Aug 2020, at 19:44, jamesd at echeque.com wrote:
> 
> Ann and Bob want to [atomically] exchange secrets.

Have a look at "How to Exchange Secrets with Oblivious Transfer", transcript at the bottom of the PDF:

  https://eprint.iacr.org/2005/187.pdf

But as Schneier says:

  "This protocol allows Alice and Bob to exchange secrets simultaneously, but says nothing about the quality of the secrets exchanged"

Maybe you could add homomorphic decryption step to verify the secrets before both sides can be atomically decrypted?

Alfie

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Alfie John
https://www.alfie.wtf