how to encode and decode using affine ciphers. You are given the following string to encrypt: good luck After encrypting, this is the string: mkkd bcay Your encryption function is h(x) = (ax +46) mod 26 x is the letter to encode h(x) is the encoded letter a is a coefficient What is the value of a such that osa s 26 ?  

1) 5 

 

2) 9 

 

3) 21 

 

4 11 

 

5) 25 

 

6) 23 

 

7) 15 

 

8) 17 

 

9) 3 

 

10) 19 

 

11) 7