Does anyone have idea about rolling code and its algorithm

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harish.n.j

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rolling code

Hi all,

Does anyone have any idea about rolling code and its algorithm.

I want to generate a 10 digit number, which is unique and has to be generated each time, . i am planning to use this for login. if someone forgot his login i need to generate a code of 10 digit number and i will provide him this number which will be used by him for login. if this number is been used already it should not work again
 

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