1,251 reputation
817
bio website
location
age
visits member for 3 years
seen 12 mins ago

Dec
7
comment How do I calculate the private key in RSA?
These are standard techniques you can find in all books.We say the same thing.In order to compute the inverse you can use the extended euclidean algorithm
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