The Secret Code

Good morning, my dear pupils.
Did you read my article on cryptography? Holmes is an skilled cryptanalyst. You can demonstrate you deserve being his assistant. Solve this little whodunit.
“Ah, Watson!” exclaimed Holmes, as his colleague entered the study of 221b. “Now that you’re back, perhaps you can give me the last two letters in this sequence, [...]

Holmes’s skills: cryptography

One of the Holmes’s skills is cryptography. Cryptography is the science that studies how to decipher encoded messages as well as how to codify them. This is an activity as old as intelligence services. Most of the ciphers are build by mathematicians or  people very skilled at mathematics.
Holmes is also a competent cryptanalyst. He relates [...]

Solution to Watson’s Niece puzzle

Good morning again my dear pupils.
It is incredible!. You took too much time in giving me the right answer. Probably it is due to the terrible Maths teacher you have. It is a question of logic, concentration and a pinch of sense of humour. Definitively ask for another teacher. The meaning of the word to deserve [...]