Jekyll deuterium’s blog Himanshu Sheoran deut-erium deuterium cryptography Capture The Flag CTF hacking cybersecurity SAT SMT solvers and computer science. https://deut-erium.github.io/feed.xml 2026-09-25T22:43:52+05:30 deuteriumhimanshu_sheoran@yahoo.com Tetrasquares: extending The New Tetris on N64 https://deut-erium.github.io/2026/09/07/tetrasquares 2026-09-07T00:00:00+05:30 2026-09-07T00:00:00+05:30deuteriumI like building squares more than clearing lines. A browser experiment with the N64 game's square mechanic, interlock bonuses, and 6x6 and 8x8 targets. After Injection https://deut-erium.github.io/ctf-tutorials/2026/09/05/the-first-door 2026-09-05T00:00:00+05:30 2026-09-05T00:00:00+05:30deuteriumhimanshu_sheoran@yahoo.comUnlock this writeup with the flag from the Injection challenge. Challenge archive: SekaiCTF 2025 - Law and Order https://deut-erium.github.io/challenges/sekaictf-2025/sekaictf-2025-law-and-order 2025-08-16T06:30:00+05:30 2025-08-16T06:30:00+05:30deuteriumhimanshu_sheoran@yahoo.comSekaiCTF 2025 - Cryptography. Challenge archive: SekaiCTF 2024 - Some Trick https://deut-erium.github.io/challenges/sekaictf-2024/sekaictf-2024-some-trick 2024-08-23T21:30:00+05:30 2024-08-23T21:30:00+05:30deuteriumhimanshu_sheoran@yahoo.comSekaiCTF 2024 - Cryptography. Challenge archive: Google CTF 2024 - McEliece https://deut-erium.github.io/challenges/google-ctf-2024/google-ctf-2024-mceliece 2024-06-21T23:30:00+05:30 2024-06-21T23:30:00+05:30deuteriumhimanshu_sheoran@yahoo.comGoogle CTF 2024 - Cryptography. Challenge archive: Google CTF 2024 - IDEA https://deut-erium.github.io/challenges/google-ctf-2024/google-ctf-2024-idea 2024-06-21T23:30:00+05:30 2024-06-21T23:30:00+05:30deuteriumhimanshu_sheoran@yahoo.comGoogle CTF 2024 - Cryptography. Challenge archive: Google CTF 2024 - desfunctional https://deut-erium.github.io/challenges/google-ctf-2024/google-ctf-2024-desfunctional 2024-06-21T23:30:00+05:30 2024-06-21T23:30:00+05:30deuteriumhimanshu_sheoran@yahoo.comGoogle CTF 2024 - Cryptography. .inputrc: VI experience in the shell https://deut-erium.github.io/2024/01/28/inputrc 2024-01-28T00:00:00+05:30 2024-01-28T00:00:00+05:30deuterium.inputrc: VI experience in the shell, published in deuterium's blog. Challenge archive: SekaiCTF 2023 - RandSubWare https://deut-erium.github.io/challenges/sekaictf-2023/sekaictf-2023-randsubware 2023-08-25T21:30:00+05:30 2023-08-25T21:30:00+05:30deuteriumhimanshu_sheoran@yahoo.comSekaiCTF 2023 - Cryptography. Challenge archive: SekaiCTF 2023 - Diffecientwo https://deut-erium.github.io/challenges/sekaictf-2023/sekaictf-2023-diffecientwo 2023-08-25T21:30:00+05:30 2023-08-25T21:30:00+05:30deuteriumhimanshu_sheoran@yahoo.comSekaiCTF 2023 - Cryptography.