[messaging] Two-party consensual file access

B Da Bahia bidabahia at gmail.com
Thu Mar 28 06:47:44 PDT 2019

Hello list,
I'm looking for a cryptographic algorithm to solve the following problem:
Alice and Bob (untrusting partners) want to cooperate to open an encrypted
file located at either one's computer. No party should be able to open it
without the other party's consent. No trusted third parties are allowed to
intervene in the protocol.
Could anyone provide useful references to explore?
thanks in advance!
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