MATLAB: I want to understand this algorithm please

suriyanath

please c an somebody teach me what is this function ,, and how we can use it i ve see it in this algorithm http://www.mathworks.com/matlabcentral/fileexchange/46824-rsa-algorithm/content/RSA_char.m that i need in my project so please if somebody can explain to me every part of this algorithm i will be grateful and please answer me soon

Best Answer

That file looks to be a straightforward implementation of RSA, which is described in the Wikipedia article for RSA. I suggest you pay careful attention to the section called "A worked example".

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MATLAB: Generation of random co-prime integers modulo n

Your question is missing a lot of information. What is the range for the integers to generate? What is the range for n? Should the generated numbers be all distinct or are repetitions allowed?

If the range is not too great, you could just test all the integers and only keep the ones that are coprimes:

maxvalue = 5000;
n = 127;
arraysize = [512, 512];
allnumbers = 1:maxvalue;
coprimes = allnumbers(gcd(allnumbers, n) == 1);
result = reshape(coprimes(randi(numel(coprimes), prod(arraysize))), arraysize);  %if repetitions are allowed
result = reshape(coprimes(randperm(numel(coprimes), prod(arraysize))), arraysize);  %if no repetition

MATLAB: Randint is undifined in 2018a

According to the Communications Toolbox Release Notes the randint function was removed in release R2016b. The suggested replacement is randi. Note that the order of the inputs to randi and the order of inputs to randint are different. The range is the third input to randint but the first input to randi (and it behaves a little differently if that range input is negative), so converting your code is not as simple as doing a Find and Replace.

Here's the documentation for randint in release R2012a for reference.

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MATLAB: Generation of random co-prime integers modulo n

MATLAB: Randint is undifined in 2018a

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