# Computing the redundancy of language for a Vigenère cipher with m=5

Redundancy of L = 1- Entropy of L/ log base 2 {P}

The Redundancy of L is given by 1 minus the Entropy of L divided by log base 2 of the Cardinality of the Plaintext space. Could someone advise me how to compute the redundancy for L here. I know that:

{P}= 26^5= 11881376

I am not sure how to compute the Entropy of L here once I have that value I can compute the redundancy...If someone could compute the Entropy of L here in this case I would be very grateful. Entropy of L is given by limit as n--> infinity of H(P^n)/n

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