<human>: Can you condense the text into three sentences or less?

Background: I just got a bachelor's degree in computer science about a month ago and immediately after that I started a two moth internship at a software developing company. I think I've made myself pretty useful in my first month(I've developed a tool to help the other programmers, I've done some research on some new technologies to be used in further developing of our projects) since my boss decided that my internship will end sooner and I'll start with a full contract like the others. 
However, I discovered that he's offering me about 25% less pay than others, even though I will be doing the same work, the same hours. The thing is, the amount of money they are given should be confidential but they told me because we've been friends long before being colleagues.
How do I ask for the same salary, without letting him know that I know how much the others are being paid?
<bot>: Boss is offering me 25% less than the other employees and I don't know how to ask for more without letting him know that they've breached the confidentiality of salaries....