Let Decrypt Again

The challenge has the most code in it so far, but should not take too long to realize the task we had to do. This follows the same idea as the prequel challenge Let’s Decrypt - that is to find an appropriate N, e such that the pow(sig, e, N) is equal to the value of the PKCS1 padded messages. However, in this challenge, we had a twist - we can only use one non-prime modulus N but has to generate three es such that pow(sig, e_n, N) = m_n with e_n being the public exponent correlated to the nth message m_n....

December 20, 2022 · 5 min · qvinhprolol