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Security and Crypto Enthusiast


Sep
10
comment General-purpose non-interactive multi-party computation protocol
Interesting but this is one the case. but not generalized SMC, you would find secret sharing scheme to be heart of SMC in most protocols , refer martin giesler's mpc thesis .
Sep
10
comment General-purpose non-interactive multi-party computation protocol
give me reference. without a dealer how is the secret shared ? ideally , each party gets results from others and collates itself if it requests the function evaluation
Sep
10
comment General-purpose non-interactive multi-party computation protocol
yes clients get the partial results via secure channels
Sep
10
comment General-purpose non-interactive multi-party computation protocol
edited the question accordingly for more clarity .
Sep
9
comment General-purpose non-interactive multi-party computation protocol
the dealer is who distributed the shares to each server , say a client distributes the shares among servers , once the protocol of function evaluation is over, all the partial results are collated by client . in a non-interactive protocol servers should not talk to each other
Sep
9
comment General-purpose non-interactive multi-party computation protocol
non-interactive means, the parties don't interact with each other. only the dealer gets all the partial results and collates them . if we use Shamir's scheme , the parties would need to interact for degree reduction while multiplication, for addition they need not ofcourse .
Sep
8
comment Distributed Asymmetric Key Decryption with threshold
yes, some other colleague also impromptuly gave me this idea . but some how it is not fitting squarely in my application . thanks anyway !
Sep
6
comment Distributed Asymmetric Key Decryption with threshold
I heard about this technique from a colleague. but could not locate the actual reference of the paper . do u have it ?
Aug
31
comment Order Preserving Encryption for Numeric Data Values
FHE cannot be used to achieve OPE, but definitely applications of OPE can be realized using FHE . I mean if OPE allows one to perform sort, compare etc , its trivial in FHE to execute such circuits on encrypted data .
Aug
30
comment Security of cloud computational protocols in UC Framework?
Good start Mike. Intuitively i feel there is some gap , may be in my understanding rather than your explanation. would get back in case more questions
Aug
29
comment Security of cloud computational protocols in UC Framework?
Well good question, MPC is too pessmestic , no party trusts other. in cloud computing only the server is not trusted . for example: we trust our friends on facebook but not facebook itself ! also in MPC all parties do computation , in CC only server does computation, so computational privacy should be modelled differently. Refer eprint.iacr.org/2013/272 for more such differences
Aug
7
comment Practical consequences of using functional encryption for software obfuscation
What does this mean , expressing program as Turing Machine ?
Aug
3
comment Can we proxy-re-encrypt using homomorphic encryption schemes?
Thanks Mayank . would check them out !
Aug
2
comment What kind of adversary is a compromised party?
may be a dumb question, what is difference between attacker and adversary ?
Aug
2
comment Can we give access to controlled functionality in Fully homomorphic encryption schemes?
Ok now i see your point too .
Aug
2
comment Can we give access to controlled functionality in Fully homomorphic encryption schemes?
Mike , VC and Delegatable HE would allow to verify operations are performed or not . But we cannot restrict/narrow down the circuits that can be allowed to run. And yes FE is right choice for limiting functionality am trying to find ways of realizing FE with FHE
Aug
2
comment Can we proxy-re-encrypt using homomorphic encryption schemes?
Thanks Reid , any idea why he suggested doing bit by bit
Aug
2
comment Can we proxy-re-encrypt using homomorphic encryption schemes?
I did not get why he suggested doing bit by bit , any idea ? . my head is reeling with the possibilities of FHE already ! :)
Aug
2
comment Can we give access to controlled functionality in Fully homomorphic encryption schemes?
it should be "access (control functionality)" i would correct it , the other one would be easy believe , rite ?
Jun
11
comment Can any one explain Circuit Privacy using fully homomorphic encryption from Gentry's thesis?
the transformation is tough, i have edited the question thanks anyway