CyberSci Regional Qualifiers 2024-25

Parts

Crypto

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For the most part the encryption mechanism was secure, using a large e, n, p and q values made most attacks unfeasible. The only liability is the block size of four which can be reasonably brute forced, especially when considering the restricted charset of only [A-Za-z0-9_-]. I therefore built a custom tool to bruteforce each block. This gave the flag cybersci{no_need_to_worry} .

Last Updated in 2025
Halifax, NS
Canada