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 Jan19 accepted Why is this authentication procedure using Rabin crypto not useful? Jan19 comment Why is this authentication procedure using Rabin crypto not useful? I understand your clarification, lets assume the challenger chooses $m$ and computes everything and sends r to A, is it still not useful? Jan19 comment Why is this authentication procedure using Rabin crypto not useful? I am not 100% sure how this can be interpreted, but in the case that $r$ is a quadrtic residue, is there anything strange in the method? Jan19 asked Why is this authentication procedure using Rabin crypto not useful? Jan18 awarded Supporter Jan18 accepted One-time pad mistake in the transmission? Jan18 accepted RSA cipher wrong use Jan18 comment RSA cipher wrong use Thank you very much, it is clear now to me. Jan18 comment RSA cipher wrong use Thanks for your answer. I mean that before we use RSA I encode the message by converting each letter of the message to an integer (space=0, a=1,b=2,c=3,...) and then encrypting this integer $k$ as $k^e \mod N$ where $N=pq$ for p,q primes and $e$ is the encrypting exponent. Why is this procedure not effective? Jan18 comment One-time pad mistake in the transmission? Thanks for your answer. How would the attacker proceed at the point he has access to both sequences? Jan18 asked RSA cipher wrong use Jan18 asked One-time pad mistake in the transmission? Nov26 awarded Student Nov26 awarded Scholar Nov26 accepted Upper bound Linear Feedback Shift Register Nov26 comment Upper bound Linear Feedback Shift Register One think that is not 100% clear; In the case that the upper bound is achieved, why is it then achieved by any non-zero initial vector? Nov26 comment Upper bound Linear Feedback Shift Register With $R$ registers I mean, that each of them contain one value from the finite field $\mathbb F_q$. Initially these contain the values $x_0,...,x_{R-1}$ which is called the initial fill. At each time step, the values in the registers are shifted down and the final register is filled by a new value determined by the old values in all of the registers. I hope this explains the term. Nov26 asked Upper bound Linear Feedback Shift Register