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I've been thinking a little bit about it, and now I think it is possible, but you have to consider the generalization of CFB in ISO 10116 (I don't have access to the ISO 10116 standard, so I will assume that the description by Rogaway is correct). The generalization of CFB from the ISO standard seems to have two main changes: The feedback block (FB), of ...


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I'll first assume $\phi$ is known, which would be the situation in RSA at key selection. A common method could be to select (odd) $\mu$ at random in some appropriate interval until $\gcd(\mu,\phi)=1$ is satisfied. In the context of RSA, it is fine (if we ignore performance an interoperability issues) to choose an RSA exponent at random in $[3\dots\phi-3]$ ...



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