Question: Consider an affine cipher operating on a language with 39 characters (i.e., calculations are done mod 39 instead of mod 26). How many valid keys

Consider an affine cipher operating on a language with 39 characters (i.e., calculations are done mod 39 instead of mod 26). How many valid keys do we have in this case?

a.

39

b.

3

c.

13

d.

24

e.

936

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