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Extended-Euclid

2026.07.13 ctf

KalmarCTF 2026 RBG+ Writeup — Cracking a Sum-Hidden RSA with Alternating Sums and Polynomial GCD

Overview KalmarCTF 2026 Crypto challenge “RBG+” (106pts). It combines RSA with an LCG (linear congruential generator): the flag m is …

1408 words | 7 min read

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