It was fun to read the Sherlock Homes story. It's been said several times that a problem with substitution ciphers English alphabet aren't very secure and it causes problem with authenticity. In this story because Sherlock figured out the code and sent a message to the killer. The killer came back to the scene of the crime when the police were there! Be careful when sending secret messages!
Difficult:
I'm still struggling to understand what to do with a fraction in front of mod n. I also don't remember how to calculate the determinate of a 3x3 matrix.
Difficult:
I'm still struggling to understand what to do with a fraction in front of mod n. I also don't remember how to calculate the determinate of a 3x3 matrix.
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