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Written by @LMBishop, also hosted at leonardobishop.net. This challenge is based on an online "gradebook", where students can log in, view their grades for their enrolled classes, and submit feedback for each one. Included in this challenge is a URL to the use...

Written by @flaberpengu. Challenge available on Github. This is an easy cryptography challenge focused on RSA. The first thing to note is that we are given n1, n2, d1, d2, e but no designated ciphertext, which is unusual. The first thing I tried was calculatin...