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Nov
28
comment Homomorphic Encryption and Semantic Security using Lattices?
I cannot understand the purpose of the noise $e$ since it can be recovered applying $\mod{2}$ to the ciphertext by everyone
Nov
28
comment Homomorphic Encryption and Semantic Security using Lattices?
@DrLecter you mean that their breakthrough is that even you encrypt with different keys $k_1$ $k_2$ two plaintexts $p_1$, $p_2$ you can evaluate homomorphically an operation in their ciphertext space? But with which key you can decrypt it?
Nov
23
comment ElGamal: Multiplicative cyclic group and key generation
You mean that $q$ should be a safe prime of the form $q=2k+1$ where $k$ is also a prime? Because in your writing you substitute $k$ with $p$ where $p$ is the prime of the initial group.Which is like a 'loop'.
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?