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    Im a first year Mathematics student and we've been given this coursework to do for the module Numbers, Groups and Codes. We are using the computer software Maple. I don't know where to start! Any help?

    A public key code has base n = 564146777 and encoding exponent
    a = 282044381.
    (i) Factorise n and calculate (n).
    (ii) Calculate the decoding exponent x (i.e. a?1 mod (n)).
    (iii) Decode the following received message using the letter to number equivalents
    in the attached table (p.4). Each block corresponds to a sequence of two letters; thus,
    since 10 corresponds to A and 11 to B, 1011 stands for AB etc.
    366514996/506479715/239338918/85377691.

    Thank you!
 
 
 
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Updated: April 8, 2011

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