Step 1: The Caesar Shift Cipher
So for example "Meet me at the park" would become "RJJY RJ FY YMJ UFWP" with the number 5 as the key.
For the first cipher it works well, but the problem is that there are only 25 possible combinations (26 would take you back to the letter you started with). As a result, if there was someone who really wanted to break the code they could simply pold there way thruogh all 25 combinations. Admittedly, they would have to know in the first place that it is the Caesar shift cipher, So this only get's a difficulty of 1 star, It's over 2,000 year's old, after all.