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I like crypto. Need I say more?


Jan
25
comment How can I find the prime numbers used in RSA?
@user11621 $N=p*q$ so, given $N$ and $p$, simply divide. If you mean you don't have a calculator that supports such large numbers, install python.
Jan
24
revised Shamir Secret Sharing Modular Reduction
added 555 characters in body
Jan
24
comment Shamir Secret Sharing Modular Reduction
@poncho, good point. I'll have to dive deeper into the protocol outlined in the paper I linked to see if it mitigates that.
Jan
24
revised Shamir Secret Sharing Modular Reduction
added 10 characters in body
Jan
24
revised Shamir Secret Sharing Modular Reduction
added 10 characters in body
Jan
24
answered Shamir Secret Sharing Modular Reduction
Jan
24
comment Secure degree reduction for Shamir's secret sharing
@user3225551 it should be in the referenced paper. That paper gives 2 MPC protocols. One in the honest-but-curious (semi-honest) model. That is the one that works as I described. The other is in the malicious model which is much more complicated. Their explanation of the multiplication step is just presented in a different manner. See also this.
Jan
24
comment Secure degree reduction for Shamir's secret sharing
Party 1 interpolates the subshares it holds and gets 3, party 2 does the same and gets 7, etc.
Jan
23
answered Secure degree reduction for Shamir's secret sharing
Jan
18
awarded  Enlightened
Jan
18
awarded  Nice Answer
Jan
17
comment Which is better ECDHE with TLS 1.0
I'm assuming you don't really want NULL as that means no confidentiality (in other words your data is sent unencrypted). I'd avoid RC4. As to what is left, what are your goals? How important is speed? In other words, what does "better" mean? Does your processor support AES-NI? Why only SHA and nothing from SHA2 family?
Jan
17
comment What is the difference between homomorphic encryption and homomorphic signature?
@user11236 advantage compared to what? to each other? that is like comparing apples and oranges.
Jan
16
comment Where can I find source code for ideal world simulation?
If you have specific questions that you were hoping to answer by looking at code, I'd suggest writing them up on here.
Jan
16
comment Where can I find source code for ideal world simulation?
The paradigm is used to prove security. I don't think anyone codes it up.
Jan
14
revised Where does the $\varphi(n)$ part of RSA come from?
added 112 characters in body
Jan
14
comment Where does the $\varphi(n)$ part of RSA come from?
@fgrieu good point.
Jan
14
comment What is the difference between homomorphic encryption and homomorphic signature?
Your question is way too broad and will likely be closed. I did my best, but you need to be more specific in what you are looking for. A general introduction (like I gave), example crypto systems, implementations, how to apply it to your problem, or something else. Your question as stated is like saying, "I want to ride a scooter instead of a motorcycle. So tell me about scooters and motorcycles."
Jan
14
answered What is the difference between homomorphic encryption and homomorphic signature?
Jan
13
comment 2PC Private Set Intersection Optimized for asymmetrically sized sets
cleaned up comments