While I can't read kanji, I'll forever remember Algebra and its application on the RSA cryptography. Good thing Flandre is actually a centuries old vampire, because this is not for kids :P

FINALLY, SOMETHING I'VE STUDIED IN DETAIL!

*sigh* Fujii Tatsuya, I hate you.
*sees book-eating Flan* Fuji Tatsuya, I love you.

EDIT:
Done. Please check it over; it's been a while since I did something with RSA.