Here's your first problem set, available in Word and PDF formats: Problem Set 1 (Word) and Problem Set 1 (PDF). It's due at the start of class on Monday, September 1st. You're welcome to turn in typeset or handwritten solutions, but please turn in a hard copy of your work. In other words, don't email me your problem set.
Also, here's an Excel file you can use to aid your decryption of the ciphertext in the first problem: PS01 - Cryptanalysis.