https://x3ric.com/blog/tags/lattice/CTF notes, systems work, and writeups.Hugoen-usSat, 06 Jun 2026 21:41:13 +0200https://x3ric.com/blog/posts/HackTheBox-400Curves-Challenge/https://x3ric.com/blog/posts/HackTheBox-400Curves-Challenge/Mon, 05 May 2025 09:20:00 +0800challengehtbcryptorsalatticeecc400Curves: turn the RSA leak into a lattice recovery, rebuild the secret values, and decrypt the flag.https://x3ric.com/blog/posts/HackTheBox-secure-source-Challenge/https://x3ric.com/blog/posts/HackTheBox-secure-source-Challenge/Sun, 16 Feb 2025 00:20:00 +0800challengehtbcryptoprnglatticeecchashsecure source: reconstruct the PRNG state from the leak, replay it, and recover the flag.https://x3ric.com/blog/posts/HackTheBox-Interception-Challenge/https://x3ric.com/blog/posts/HackTheBox-Interception-Challenge/Fri, 31 Jan 2025 09:20:00 +0800challengehtbcryptolatticehashInterception: model the leak as a small lattice problem, recover the secret, and verify the flag.https://x3ric.com/blog/posts/HackTheBox-Inside-the-Matrix-Challenge/https://x3ric.com/blog/posts/HackTheBox-Inside-the-Matrix-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbcryptorsalatticeInside the Matrix: turn the RSA leak into a lattice recovery, rebuild the secret values, and decrypt the flag.https://x3ric.com/blog/posts/HackTheBox-Mayday-Mayday-Challenge/https://x3ric.com/blog/posts/HackTheBox-Mayday-Mayday-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbcryptolatticeMayday Mayday: model the leak as a small lattice problem, recover the secret, and verify the flag.https://x3ric.com/blog/posts/HackTheBox-Arranged-Challenge/https://x3ric.com/blog/posts/HackTheBox-Arranged-Challenge/Wed, 22 Jan 2025 09:20:00 +0800challengehtbcryptoaeslatticeecchashArranged: abuse the AES misuse, derive the missing key material, and decrypt the flag.https://x3ric.com/blog/posts/HackTheBox-Bloom-Bloom-Challenge/https://x3ric.com/blog/posts/HackTheBox-Bloom-Bloom-Challenge/Wed, 22 Jan 2025 09:20:00 +0800challengehtbcryptoaeslatticehashBloom Bloom: abuse the AES misuse, derive the missing key material, and decrypt the flag.https://x3ric.com/blog/posts/HackTheBox-Birds-of-randomness-Challenge/https://x3ric.com/blog/posts/HackTheBox-Birds-of-randomness-Challenge/Fri, 13 Dec 2024 09:20:00 +0800challengehtbcryptorsaprnglatticeeccEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Lost-Modulus-Again-Challenge/https://x3ric.com/blog/posts/HackTheBox-Lost-Modulus-Again-Challenge/Fri, 13 Dec 2024 09:20:00 +0800challengehtbcryptorsalatticeEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-LostKey-Challenge/https://x3ric.com/blog/posts/HackTheBox-LostKey-Challenge/Fri, 13 Dec 2024 09:20:00 +0800challengehtbcryptorsaaeslatticeecchashEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Quick-Maffs-Challenge/https://x3ric.com/blog/posts/HackTheBox-Quick-Maffs-Challenge/Fri, 13 Dec 2024 09:20:00 +0800challengehtbcryptolatticeEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Shamirs-Secret-Challenge/https://x3ric.com/blog/posts/HackTheBox-Shamirs-Secret-Challenge/Thu, 12 Dec 2024 09:20:00 +0800challengehtbcryptolatticeshamirEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-YALM-Challenge/https://x3ric.com/blog/posts/HackTheBox-YALM-Challenge/Thu, 12 Dec 2024 09:20:00 +0800challengehtbcryptorsalatticeEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Brevi-Moduli-Challenge/https://x3ric.com/blog/posts/HackTheBox-Brevi-Moduli-Challenge/Sat, 16 Nov 2024 09:20:00 +0800challengehtbcryptorsalatticeBrevi Moduli: turn the RSA leak into a lattice recovery, rebuild the secret values, and decrypt the flag.