For my upcoming exam in Algorithms, as part of Cryptography, we are supposed to be able to solve these types of questions. I don't have the notes from that lecture, so I'm finding it difficult to figure out on my own.
A commented solution or references to what to I should read would be great.
Here is a an example problem:
Knowing that $7919$ and $7907$ are prime, solve the following:
I have found this video to be very helpful: YouTube