https://x3ric.com/blog/tags/prng/CTF notes, systems work, and writeups.Hugoen-usSat, 06 Jun 2026 21:41:13 +0200https://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-Not-that-random-Challenge/https://x3ric.com/blog/posts/HackTheBox-Not-that-random-Challenge/Fri, 31 Jan 2025 09:20:00 +0800challengehtbcryptoprnghashNot that random: reconstruct the PRNG state from the leak, replay it, and recover the flag.https://x3ric.com/blog/posts/HackTheBox-RLotto-Challenge/https://x3ric.com/blog/posts/HackTheBox-RLotto-Challenge/Fri, 31 Jan 2025 09:20:00 +0800challengehtbcryptoprngRLotto: reconstruct the PRNG state from the leak, replay it, and recover the flag.https://x3ric.com/blog/posts/HackTheBox-AHS512-Challenge/https://x3ric.com/blog/posts/HackTheBox-AHS512-Challenge/Wed, 22 Jan 2025 09:20:00 +0800challengehtbcryptoprnghashAHS512: reconstruct the PRNG state from the leak, replay it, and recover 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-Broken-Decryptor-Challenge/https://x3ric.com/blog/posts/HackTheBox-Broken-Decryptor-Challenge/Fri, 13 Dec 2024 09:20:00 +0800challengehtbcryptoxorprngEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Embryonic-Plant-Challenge/https://x3ric.com/blog/posts/HackTheBox-Embryonic-Plant-Challenge/Fri, 13 Dec 2024 09:20:00 +0800challengehtbcryptoaesprnghashEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Signing-Factory-Challenge/https://x3ric.com/blog/posts/HackTheBox-Signing-Factory-Challenge/Fri, 13 Dec 2024 09:20:00 +0800challengehtbcryptoprnghashSigning Factory: reconstruct the PRNG state from the leak, replay it, and recover the flag.https://x3ric.com/blog/posts/HackTheBox-Rhome-Challenge/https://x3ric.com/blog/posts/HackTheBox-Rhome-Challenge/Thu, 12 Dec 2024 09:20:00 +0800challengehtbcryptoaesprnghashEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Flippin-Bank-Challenge/https://x3ric.com/blog/posts/HackTheBox-Flippin-Bank-Challenge/Sat, 23 Nov 2024 09:20:00 +0800challengehtbcryptoaesprngFlippin Bank: reconstruct the generator state, derive the AES material, and decrypt the final ciphertext.https://x3ric.com/blog/posts/HackTheBox-Gonna-Lift-Em-All-Challenge/https://x3ric.com/blog/posts/HackTheBox-Gonna-Lift-Em-All-Challenge/Sat, 23 Nov 2024 09:20:00 +0800challengehtbcryptoprngGonna Lift Em All: reconstruct the PRNG state from the leak, replay it, and recover the flag.https://x3ric.com/blog/posts/HackTheBox-Sekur-Julius-Challenge/https://x3ric.com/blog/posts/HackTheBox-Sekur-Julius-Challenge/Sat, 16 Nov 2024 09:20:00 +0800challengehtbcryptoprngSekur Julius: reconstruct the PRNG state from the leak, replay it, and recover the flag.https://x3ric.com/blog/posts/HackTheBox-SPG-Challenge/https://x3ric.com/blog/posts/HackTheBox-SPG-Challenge/Sat, 16 Nov 2024 09:20:00 +0800challengehtbcryptoaesprnghashSPG: reconstruct the generator state, derive the AES material, and decrypt the final ciphertext.