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Dec
6
comment Why the following attack in common modulus RSA works?
You said that even if we do not know $\lambda(N)$ we can learn $k \lambda(N)$ which is true. But then how you apply the $mod(\lambda(N))$ operation?
Dec
5
comment Is an elliptic curve over $\mathbb{F}_p$ order preserving for the points $(x,y) \in \mathbb{Z}_p$?
sorry i assume there are always positive.
Dec
5
comment Is an elliptic curve over $\mathbb{F}_p$ order preserving for the points $(x,y) \in \mathbb{Z}_p$?
I assume that x,y are always smaller than the modulo
Dec
5
comment Modulus for elliptic curve point multiplication
@CodesInChaos I thought we always think for polynomial interpretations in finite fields (?)
Dec
3
comment Graphically representing points on Elliptic Curve over finite field
What does this mean?
Dec
3
comment Graphically representing points on Elliptic Curve over finite field
side question: How can you find a base point of a curve?Or because the underlying field is of prime order so all the points of the curve they do form a basis?
Nov
29
comment Mapping between subgroups and the integers
Can you elaborate more on the security reasons that we do not use all elements in $\mathbb{Z}_p^*$ but only a subset of them?
Nov
28
comment Homomorphic Encryption and Semantic Security using Lattices?
@DrLecter " If you look at the definition of the homomorphic addition (multiplication) you see that they use ciphertexts with respect to independently chosen $a$ and $a′$ for encryption of message $m$ and $m′$ ": different a->different keys
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?