My write-up for the BreizhCTF 2025 medium crypto challenge AutHentification 1, where I analyzed an AES-GCM misuse (fixed key/nonce and missing tag verification), treated it like a reusable stream c...

My write-up for the Verilicious medium crypto challenge, where I analyzed information leaks in PKCS#1 v1.5 padding, translated the samples into a Hidden Number Problem (HNP) instance, and leveraged...