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There is 1 message, it is encrypted with 6 different keys, each has E = 5. I tried various attacks, but they do not seem to work.

Is it possible to receive a private key / encrypted message? Is it safe to use a small E?

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  • $\begingroup$ The question's first paragraph is a duplicate (assuming textbook RSA or a common padding is used). The rest seems to ask something different (with little details). It is best to ask a single thing per question (or only closely related ones). $\endgroup$ – fgrieu Sep 14 '18 at 11:54

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