Martin Sustrik
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# 16 Actions

 Oct21 awarded Supporter Oct21 accepted Verifying encrypted addition Oct21 comment Verifying encrypted addition Ok, got it. Thanks! Oct21 comment Verifying encrypted addition As for comparing c3 and c'3, my impression was that the homomorphic encryption schemes may introduce randomness to the process, so that c3 != c'3, even though they are sum of same numbers. See the link, I've posted above. Oct21 comment Verifying encrypted addition Imagine a game with cards. Each participant has secret information (the cards in the hand) that he doesn't want to disclose to other participants. He can also perform an operation (say exchange one of the cards) but he doesn't want to disclose the result of the operation, i.e. the resulting set of cards in the hand should remain secret. However, other participants want to ensure that he played by rules, i.e. he exchanged exacly one card. In general, the goal is to ensure that every participant plays by rules without disclosing their secret. Oct21 revised Verifying encrypted addition added 62 characters in body Oct21 awarded Editor Oct21 revised Verifying encrypted addition added 62 characters in body Oct21 comment Verifying encrypted addition How would you approach the problem via ZKP? Sorry, I am not a cryptographer, so I'm just trying to get my head around this. Oct21 comment Verifying encrypted addition Btw, there's a system that can be used this way outlined in the accepted answer here: crypto.stackexchange.com/questions/6732/… however it requires revealing r3 to Bob. Can we do better? Oct21 asked Verifying encrypted addition Oct21 awarded Scholar Oct21 comment Is there an encyption scheme that combines additive homomorphism with ability to proxy re-encrypt? That's really helpful. Thanks! Oct21 accepted Is there an encyption scheme that combines additive homomorphism with ability to proxy re-encrypt? Oct21 awarded Student Oct20 asked Is there an encyption scheme that combines additive homomorphism with ability to proxy re-encrypt?