Ctf
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
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7 min read
2026.07.13
ctf
KalmarCTF 2026 0racle Writeup — Peeling Off Heaven's Gate and Self-Modifying Code to Brute-Force FNV-1a
Overview KalmarCTF 2026 Rev challenge “0racle” (123pts). A Windows PE32 GUI application built with Free Pascal / Lazarus, themed around …
1444 words
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7 min read
2026.03.29
ctf
KalmarCTF 2026 RootBabyKalmarCTF Writeup — Zip Slip (CVE-2026-30345) for CTFd Root
Overview KalmarCTF 2026 Web challenge “RootBabyKalmarCTF” (170pts). A CTFd 3.8.1 instance is provided with admin credentials for the …
610 words
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3 min read