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Oct
28
comment How does order-preserving encryption work?
What are the other conditions for sufficient IND-OCPA?
Oct
28
comment How does order-preserving encryption work?
@pg1989 Also it would great to check your code :)
Oct
28
comment How does order-preserving encryption work?
@pg1989 but at some point in the paper it says that the ciphertext space should be exponential in the plaintext space. How this is put as input to an OPE?How we parametrize OPE with such info?
Oct
28
comment Calculating ciphersize of Paillier, SSE and OPE
@e-sushi Also the question for the OPE is: Should we apriori know and store all the plaintexts we want to encrypt with an OPE or/and the possible ciphertext values before encryption?
Oct
28
comment Calculating ciphersize of Paillier, SSE and OPE
@e-sushi I don't think the ciphertext size is exponential to the plaintext size according to the paper you provided. the ciphertext SPACE size is exponential to the plaintext SPACE size. The actual ciphertext is the output of AES according to the paper.
Oct
28
comment Secure order preserving hash function
@pg1989 if you can sum up the new results of the paper it would be great
Oct
28
comment How does order-preserving encryption work?
@pg1989 Do i have a priori to save all the codomain(possible output values) or just a range can do the work?The same question for the domain. I should know and save a apriori the values i want to encrypt?
Oct
23
comment Open source implementations of Symmetric Searchable Encryption and Order Preserving Encryption
Understand the design of these schemes and implement them :)
Oct
21
comment Security of cloud computational protocols in UC Framework?
@mikeazo so at the end you need a reductionist proof as with game-based proofs...So what's the different? What security definitions conceptually the ideal/real paradigm demonstrates that the game-based proofs does not, if any?To be more specific: Is there any case that even if Paillier is CPA you can end up in an insecure protocol by the security analysis with the ideal/real paradigm?
Oct
21
comment Security of cloud computational protocols in UC Framework?
@mikeazo. Can you give a protocol or a reference where its security is proven under the ideal/real paradigm. I mean to show how this indistinguishability between interaction of real and ideal environments is shown. Like you did but it seems very simplistic. I would expect at some point a reduction to a believed hard problem. For instance how the protocol you provided cannot be secure? Its security doesn't lie whether Paillier is CPA?
Oct
16
comment What exactly is the impact of the hidden subgroup problem on cryptography?
Can we say that HSP is the decisional version subgroup problem as presented here: goo.gl/wOiCzR (The BGN cryptosystem)
Oct
14
comment Division in paillier cryptosystem
Why no? If you just don't care about the remainder, isn't it like a multiplication with the inverse, which can be seen as a constant multiplication, thus able to be homomorphically evaluated by a Paillier encryption circuit?
Oct
4
awarded  Popular Question
Oct
2
answered Attribute-based cryptography
Oct
1
comment Is there any opensource white-box implementation of AES or DES?
Check out this as well crypto.stackexchange.com/questions/6002/…
Sep
18
accepted Can the AES encryption and decryption algorithms be described as a polynomial for a specific key?
Sep
13
comment Can the AES encryption and decryption algorithms be described as a polynomial for a specific key?
@D.W.Count you point me in some paper that treats AES as a polynomial for cryptanalysis or any other reason?
Sep
12
asked Can the AES encryption and decryption algorithms be described as a polynomial for a specific key?
Aug
6
comment How does order-preserving encryption work?
@pg1989 Also i am kind of confused at your explanation of the connection of OPE and HGD: "this gives us an $x \le y$ that describes the number of points of our order-preserving function less than $y$" you mean points from the range or points from the domain?
Aug
6
comment How does order-preserving encryption work?
@pg1989 are you planing to make public your prototype implementation of the OPE scheme?