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#### Chapter 0 : Welcome Aboard!

This is where the story begins.
It is summer of 2009.
After you apply for an Internship programme at the Cryptography division of a private investigation firm called Agil Investigation Inc., you get a letter from its director.
A G I L I n v e s t i g a t i o n I n c .
Spellborough, U.K.
2 May, 2009
Dear ,
Your past accomplishments as mentioned in your resume as well as your performance in the interview and the demo-test, have finally compelled us to hire you as an intern in our Cryptography and Cyber Security division. You are welcome to commence your training at our campus from Monday this week. Or alternatively, you can also provide your services via remote correspondence. If you choose the latter, you will be sent a series of letters, with some Cryptography challenge in each; and on solving which, you will be able to help us directly on a professional case that we are assigned with.
We welcome you to embark on this journey of learning the mysterious art and science of codes and ciphers, and simulatenously earn an investigative experience.
All the best.
Sincerely,
Christopher Nott
Director
You choose the remote correspondence option, and the Head of Cryptography and Cyber Security Division writes to you the next day.
A G I L I n v e s t i g a t i o n I n c .
Spellborough, U.K.
3 May, 2009
Dear ,
Welcome to Agil.
As you have chosen the letter-correspondence as the preferred mode of this internship, you will recieve timely letters which will define to you your Cryptography assignments. You will have to solve those challenges and submit the solution to us in short time. During this time, with some luck, you might get the chance to uncover a mystery or two, regarding a real-life case that you will be tasked with. We expect you to be completely sincere as well as secretive about all the matters that you will work upon during this time period.
For learning requisite crypotgraphy techniques, you can use online or offline version of our Cryptolab which will provide all the related tools and articles.
Finally, by the end of this programme, we hope that you will become a better version of yourself and capable of exploring new horizons that await you in the magical and fascinating realm of Cryptography.
All the Best.
Sincerely,
Earle Smith
Head
(Cryptography and Cyber Security Division)
P.S.
The real assignment series will begin from the next letter. But till then, try out a dummy challenge.
What can this mean? BHJM (Hint: A*I*)
Solution
done