Learn English – How to say “time span of data” formally

I wouldn't use compromise as a noun in a security context. Some possible alternatives:

• breach
• penetration
• exploit

These all have other meanings, but each of them has gained traction in a security setting and would be understood (although "penetration" might cause some giggles among the middle-school crowd) in a way that "compromise" would not.

As @ChrisSunami says, if a person judging or grading your paper says "this is the standard", then I'd follow that standard. You could find some authority that disagrees and argue about it, but what would you gain? Even if you forced the person to concede, he might then be annoyed with you and be looking for ways to mark you down. There's no point starting an argument that you really can't win. Just follow the rules you're given.

There are two easy ways to avoid using "I" in a paper:

One, use passive voice. "Suggestions for performing cognitive workthroughs were received ..."

Two, personify the paper. "This paper presents several algorithms for ..." rather than "I present several algorithms for ..."

Oh, a third option occurs to me. I've read technical papers where the author refers to himself by some sort of description in the third person. Like, "The researcher performed several experiments using flux capacitors ..." This is especially true when there are several authors, or one person describing the work of several people. "The researchers investigated ...", "The team considered ...", etc.