[messaging] Two-party consensual file access

[david wong]

Shamir sharing scheme to split the key in two. Send your half to the other one to let them decrypt it. 

David

Sent from my iPhone

> On Mar 28, 2019, at 3:36 PM, Ben Laurie <ben at links.org> wrote:
> 
> Who encrypted this file?
> 
>> On Thu, 28 Mar 2019 at 13:48, B Da Bahia <bidabahia at gmail.com> wrote:
>> 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!
>> 
>> _______________________________________________
>> Messaging mailing list
>> Messaging at moderncrypto.org
>> https://moderncrypto.org/mailman/listinfo/messaging
> _______________________________________________
> Messaging mailing list
> Messaging at moderncrypto.org
> https://moderncrypto.org/mailman/listinfo/messaging
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://moderncrypto.org/mail-archive/messaging/attachments/20190328/ba25cb5a/attachment.html>