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    Sorry for yet another IA help thread, but I seriously need some help deciding which topic to do my Math HL IA on. I've been thinking of doing my IA on types of cryptography, but my teacher shot down both of my ideas (RSA and Elliptic curve cryptography) saying they were too hard for an IA.

    I could investigate the modular arithmetic side of RSA encryption, but I'm not sure if that's enough. My teacher also suggested to me to find earlier methods of encryption, but I don't know how to approach such a topic.

    Other ideas I came up with are Gabriel's horn, but my class didn't learn integral calculus yet so I basically have to each myself in a week. I also thought about just picking a random lake and measuring the volume and surface area using calculus, which would involve the shoreline paradox and similar mathematics. Can you guys give me any recommendations? Thanks.

    Hi there,

    I'm in Math HL too, although I haven't chose an IA topic yet, but I think people tend overestimate how long the Math HL IA is; as in how much they can effectively cover in it.

    For this reason I would suggest going for your lake size approximation.

    However, I can also see why you would find RSA encryption interesting and why you'd want to write your IA about it. Remember that according to IB, your teacher does NOT have to agree with your topic choice, they don't have the power to veto your topic. This is your paper and only you are responsible for it.
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