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Nov
21
comment Hashing/encrypting an integer to produce an unique integer in the same range
Why?if there is a fast hash algorithm, that you can truncate its output?IT's like shooting the fly with a bazooka
Nov
21
comment Hashing/encrypting an integer to produce an unique integer in the same range
If the reverse is not needed this is like a one way function like a hash function and not an encryption function.
Nov
19
comment Is the following aggregation scheme private?
If somehow the UA never gets encrypted data per single user but always in a pair manner?I.e: Data are first sent to the TD and then it sends to the UA $d_1 H(r)^{k_1}d_2 H(r)^{k_2}$ but this sounds stupid...since now the TD can decrypt but we make the assumption that is trusted
Nov
3
comment Can you give me an example of any PKC encrytion algorithm with coins?
@K.G. Sorry but i think you don't understand my words. The question says clearly:"Can you give me examples of PKC encrytion algorithms with coins?" And my comment is that you didn't give any PKC that tosses coins. I am not arguing technically that all PKC tosses coins but you don't answer to the question.You are re-explaining that PKC tosses coins without giving concrete examples. Am i clear now?
Nov
3
comment Can you give me an example of any PKC encrytion algorithm with coins?
Sorry i think you don't understand what i am saying.The question says describe me a PKC that toss coins doesn't say re-explain me the
Nov
3
comment Can you give me an example of any PKC encrytion algorithm with coins?
I don't disagree that any PKC does toss coins. But the question is different
Nov
3
comment Can you give me an example of any PKC encrytion algorithm with coins?
This answer doesn't follow the question. You don't give any PKC that tosses coins.
Nov
1
comment Question about the definition of a perfect cipher
The probability says that the ciphertext improves the probability of recovering the ciphertext as much as in a situation in which you don't have the ciphertext at all
Nov
1
comment Question about the definition of a perfect cipher
why you need b?why p is prime?
Nov
1
comment How is digital signature different from a message authentication code (MAC)?
Explain the negative vote in order to improve :)
Nov
1
comment How is digital signature different from a message authentication code (MAC)?
no MAC is for message integrity.That is nobody has tampered with your message. Put it simpler an attacker cannot provide valid ciphertexts.
Nov
1
comment Hash of multiset of values, which lets me compute the hash of the union
it sounds that you need a homomorphic hash function if exists
Oct
30
comment How to develop a public key cryptosystem based on a hard problem?
Why do you need to propose this algorithm?Does it outperforms the existing ones?What you are describing sounds as a pseudorandom generator
Oct
29
comment How does order-preserving encryption work?
let us continue this discussion in chat
Oct
29
comment How does order-preserving encryption work?
Sorry my fault. But in Boldyreva's paper it is stated:"Below, we show that IND- OCPA is unachievable by a practical order-preserving encryption scheme, in that an OPE scheme cannot be IND-OCPA unless its ciphertext-space is extremely large (exponential in the size of the plaintext-space)" So the explanation by somebody would be ok lets make an exponential size of ciphertext space...
Oct
28
comment How does order-preserving encryption work?
So the exponential ciphertext space size is not needed at all with respect to security ?
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?