This question already has an answer here: Calculating (a^b)%MOD 7 answers I am wondering how to calculate x^y mod z. x and y are very large (can't fit in 64 bit integer) and z will fit 64 bit integer. And one thing don't give answers like x^y mod z i

I'm using the Javascript implementation of RSA from this webpage, and I've generated my keypair there. As such, I have p, q, the public exponent, the public modulo, the private exponent and the private inverse. How can I use .NET's RSACryptoServicePr

Trying to code signature verification using Sun JCE with test vectors from the CAVP program. i'm given public key exponent, and modulus, as well as the message and signature. I do the following: private static boolean verifySignature(String algo, Pri

I'm trying to decrypt a message that was encrypted using the RSA algorithm The example from above is taken from Website, so I tried to implement it in C#: int msg = 67; int Ee = 5; int Nn = 91; int Dd = 29; var cipher = Math.Pow(msg, Ee) % Nn; var ms

I need to compute sin(4^x) with x > 1000 in Matlab, with is basically sin(4^x mod 2π) Since the values inside the sin function become very large, Matlab returns infinite for 4^1000. How can I efficiently compute this? I prefer to avoid large data typ

Our application downloads about 15meg of images and displays them in a html canvas. We are doing a bit of stress testing and have found that after we have about 10 tabs open if we put the computer in sleep mode, when it comes back the canvas is blank

I have a modulus and private exponent. How can I generate an RSA private Key in JavaScript from that? Or if these values are not enough to generate a RSA private Key. What are the other values that I might possibly need. RSAPrivateKeySpec in Java 7 i

As the titles says, i would like to know how to best use Cipher instance in multi threaded environment given the RSA algorithm. I have read a couple of questions on the topic, and from what i gathered: Cipher is not thread safe as it maintains intern

I was tasked with writing a small Java console application that involves encryption. I am not familiar with encryption, so I had to do some reading up first. So far the high level requirements given is that AES-256 should be used to generate a one-ti

If I start a Java app, it initiates and does some work then goes to thread sleep for an hour, then wake up after an hour and does some more work ... But my PC is running Win7 and after 15 minutes of inactivity, it will go into sleep mode, so my quest

How should I write this: (d*a)mod(b)=1 in order to make it work properly in Ruby? I tried it on Wolfram, but their solution: (da(b, d))/(dd) = -a/d doesn't help me. I know a and b. I need to solve (d*a)mod(b)=1 for d in the form d=....It's not clear

While doing a lot of benchmarking stuff these days, I stumbled upon something very disturbing / interesting / new to me. After doing some research getting more and more to the point (which i couldnt believe), it seems that windows xp (and probably al

In standard use of asymmetrical cryptographic system, encryption is done with public key, decryption with private key. Inversing the process, "encryption with private key" is called "signing". Standard tools, despite terminology and la

Today I encountered this article about decimal expansion and I was instantaneously inspired to rework my solution on Project Euler Problem 26 to include this new knowledge of math for a more effecient solution (no brute forcing). In short the problem