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8h
comment ElGamal in $Z^*_{p^n}$
@fkraiem, sorry I should have been clearer. I know that it is cyclic. I was asking of that was the question the OP was intending.
9h
comment ElGamal in $Z^*_{p^n}$
I noticed you posted this a few weeks ago on math.SE‌​. You shouldn't post the same question to multiple sites. If a question is not receiving enough attention on one site and is on-topic on another, you can flag it for moderator attention and ask them to migrate it.
9h
comment ElGamal in $Z^*_{p^n}$
Why what happens? Why $\mathbb{Z}_{p^n}^*$ is cyclic?
9h
comment How to find the crypt algorithm from a table of crypt vs results? I guess this is MD5
It sounds like it wouldn't be possible then, given the information you've provided. Let's assume it is salted MD5. You have no idea how long the salts are. If they are short, you could brute-force it, but they could also be very long.
10h
comment What is stream cipher? Where are we using stream ciphers?
This is really a basic question that you should be able to easily find answers to by searching duckduckgo (you thought I was going to say google, didn't you). This site is not meant to be a replacement for doing your own research.
2d
comment Basic cryptography
If you are only interested in common ones that can be found on the internet, why are you asking us to list them? Can you just find them yourself?
2d
comment Basic cryptography
Are you only interested in insecure ones like Caesar's?
2d
comment Example: pre-image resistance to second pre-image resistance
@Maeher but with the identity function, you don't have preimage resistance.
2d
comment Converting a pre-image resistant hash to second pre-image resistant
Can collision resistance be assumed too? Or only pre-image resistance?
2d
comment Example: pre-image resistance to second pre-image resistance
@juaninf Is the restriction of the input of $f$ to $\{0,1\}^n$ (instead of $\{0,1\}^*$) for a particular reason?
2d
revised What consequences do the plaintext space size has on the performances in the BGV scheme?
Edited to make it a question
2d
comment Simulator in Private Outsourced Computation over Outsourced Datasets
I figured it was a mistake. :) The simulator should mimic the real world. So if cheating can occur undetected in the real world with some probability, it should hold in the ideal world too.
2d
comment Simulator in Private Outsourced Computation over Outsourced Datasets
@user13676 So client's in real world only detect malicious behavior with negligible probability? Doesn't sound like a very useful protocol.
2d
comment Simulator in Private Outsourced Computation over Outsourced Datasets
@user13676 That said, who determines whether or not cheating is taking place? In the UC world (which I am most familiar with), it would be $\mathcal{Z}$.
2d
comment Simulator in Private Outsourced Computation over Outsourced Datasets
@user13676 The simulator does not detect anything. The simulators goal is to make the two worlds indistinguishable. In particular, a quote from an answer on your other question is important to remember "the simulator typically works by running the real-world adversary". So the simulator actually acts as the adversary in some sense.
2d
awarded  Revival
2d
comment need help for decrypting a cipher.. i am new to this so was wondering if someone could tell me how to go about it
@knowledgeseeker I can understand your frustration, but we have a high bar for questions on this site. Take a look at the article I linked to and the rest of the help center. Also, to put your question in prospective, what if someone asked you "How do I build a car? What are the basic steps to building a car?" There would be entire books on the topic. Just as there are entire books on cryptanalysis. This site will be very useful in your search for knowledge if you ask narrowly scoped, answerable questions.
2d
comment need help for decrypting a cipher.. i am new to this so was wondering if someone could tell me how to go about it
After the edit, I'd say this question is now too broad. I suggest you take a look at this writeup in the help center
Jul
28
comment Is there any such thing as “proof of location”?
Can they be anywhere in the world? I.e., is there any bound on their distance from you? Not sure if this is really the right site for this question. Security.SE may be better. We can migrate if needed.
Jul
28
answered Paillier Encryption: problems with double encryption