Cryptography

A type of CTF challenge which typically involves cryptographic algorithms. Don't expect too many posts here. My crypto skills are next to non-existent (though I yearn to set time aside to go deeper).

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Thumbnail for Reverse Engineering a Siemens Programmable Logic Controller for Funs and Vulns (CVE-2024-54089, CVE-2024-54090 & CVE-2025-40757)
Thumbnail for Reverse Engineering a Siemens Programmable Logic Controller for Funs and Vulns (CVE-2024-54089, CVE-2024-54090 & CVE-2025-40757)

Reverse Engineering a Siemens Programmable Logic Controller for Funs and Vulns (CVE-2024-54089, CVE-2024-54090 & CVE-2025-40757)

When security by obscurity breaks...

Thumbnail for HKCERT CTF 2022 – Base64 Encryption
Thumbnail for HKCERT CTF 2022 – Base64 Encryption

HKCERT CTF 2022 – Base64 Encryption

Frequency analysis with a touch of heuristics.