deuterium Himanshu Sheoran's blog on tech, security, CTFs and cryptography

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0CTF1202055202112022320232ACSC1AES5AI1BATPWN3BlowFish1Bsides3CBC1CRT1CTF2DES1ECC2ECDLP2ECM4GCD1GCM1GF21HSCTF11HTB1LC41LCG2Nullcon1PoW1QR1RACTF14RSA16SDCTF1SPN1abbreviations1affine1alpertron4artificial intelligence1assignment1base121base645bash1bifid1big e1bit flipping1bonehdurfee1bootleg2bruteforce1challenges24choosen plaintext2classical8close primes1combinatorics1contribution2coppersmith1cryptanalysis2crypto22cryptography57cyber apocalypse1cybersecurity1dialogue1differential1encoding3errorcorrection1fernet1franklinreiter1games1gaussian elimination1golang1googlectf2gromark1guess6hacking1hashcollision1hastad broadcast1hillcipher1injection1inputrc1introduction7invalid curve1invariant1javascript1known plaintext2leakage1magic1matrixinverse1mersenne twister3misc1miscellaneous1morse1nahamcon8netcat13oracle2out of context1padding1paillier1palindrome1permutation2polynomialring1ponder1poo-i-try1prime1productivity1programming1pun1python bytes1python walrus1quipquip2railfence1randoblurry3rc42redpwn8reversing2rgbCTF2sagemath5schmidtsamoa1short1small e2small factors1small prime2smt1substitution6testing1tetris1timeseed1transposition1twin prime1vignere2vim1wargames1weak keys1welcome1wordgame3xor8z34zh3r08zh3r0 ctf24

2026

2 posts
  1. Tetrasquares: extending The New Tetris on N64 Blog games
  2. After Injection Tutorials challenges

2025

1 posts
  1. Challenge archive: SekaiCTF 2025 - Law and Order Tutorials challenges

2024

5 posts
  1. Challenge archive: SekaiCTF 2024 - Some Trick Tutorials challenges
  2. Challenge archive: Google CTF 2024 - McEliece Tutorials challenges
  3. Challenge archive: Google CTF 2024 - IDEA Tutorials challenges
  4. Challenge archive: Google CTF 2024 - desfunctional Tutorials challenges
  5. .inputrc: VI experience in the shell Blog productivity

2023

5 posts
  1. Challenge archive: SekaiCTF 2023 - RandSubWare Tutorials challenges
  2. Challenge archive: SekaiCTF 2023 - Diffecientwo Tutorials challenges
  3. Nullcon HackIM 2023 Crypto - Curvy Decryptor Writeups ECC
  4. Challenge archive: HTB Cyber Apocalypse 2023 - Blokechain Tutorials challenges
  5. ACSC qualifiers 2023 Crypto - SusCipher Writeups Solver

2022

11 posts
  1. Challenge archive: SekaiCTF 2022 - FaILProof Tutorials challenges
  2. Challenge archive: SekaiCTF 2022 - FaILProof Revenge Tutorials challenges
  3. Challenge archive: SekaiCTF 2022 - Diffecient Tutorials challenges
  4. Google CTF 2022 Crypto - Maybe Someday Writeups Crypto
  5. What does the term "AI" actually stand for? Ramblings abbreviations
  6. Cyber Apocalypse HTB 2022 Crypto - Memory Acceleration Writeups Solver
  7. SDCTF 2022 Crypto - Tasty Crypto Roll Writeups Solver
  8. Pondering randoblurry improvements Ramblings wordgame
  9. Trying out randoblurry Ramblings wordgame
  10. New word game - randoblurry Ramblings wordgame
  11. No Year Resolution Ramblings poo-i-try

2021

18 posts
  1. Crypto challenge - Wiki Mersenne Blog challenges
  2. Crypto challenge - Untwist Me Blog challenges
  3. Crypto challenge - Mersenne seed recovery Blog challenges
  4. Crypto challenge - Injection Blog challenges
  5. Google CTF 2021 Crypto - Pythia Writeups Symmetric
  6. What Are Assignments Tutorials introduction
  7. Challenge archive: zh3r0 CTF V2 2021 - twist_and_shout Tutorials challenges
  8. Challenge archive: zh3r0 CTF V2 2021 - real_mersenne Tutorials challenges
  9. Challenge archive: zh3r0 CTF V2 2021 - import numpy as MT Tutorials challenges
  10. Challenge archive: zh3r0 CTF V2 2021 - cheater mind Tutorials challenges
  11. Challenge archive: zh3r0 CTF V2 2021 - chaos Tutorials challenges
  12. Challenge archive: zh3r0 CTF V2 2021 - b00tleg Tutorials challenges
  13. Challenge archive: zh3r0 CTF V2 2021 - 1n_jection Tutorials challenges
  14. Welcome Blog welcome
  15. Contributions Blog introduction
  16. Challenges Blog introduction
  17. Contribute Tutorials introduction
  18. What are CTFs Tutorials introduction

2020

56 posts
  1. List of Hacking Sites Tutorials introduction
  2. rgbCTF 2020 Crypto - N-AES Writeups Symmetric
  3. rgbCTF 2020 Crypto - Adequate Encryption Standard Writeups Symmetric
  4. 0CTF/TCTF 2020 Crypto - babyring Writeups Symmetric
  5. Redpwn 2020 Crypto - worst_pw_manager Writeups Symmetric
  6. Redpwn 2020 Crypto - Pseudo-key Writeups Classical
  7. Redpwn 2020 Crypto - primimity Writeups RSA
  8. Redpwn 2020 Crypto - Itsy Bitsy Writeups Crypto
  9. Redpwn 2020 Crypto - base646464 Writeups Encoding
  10. Redpwn 2020 Crypto - Alien Transmissions v2 Writeups Solver
  11. Redpwn 2020 Crypto - 4k-rsa Writeups RSA
  12. Redpwn 2020 Crypto - 12 Shades of Redpwn Writeups Crypto
  13. zh3r0 2020 Crypto - gboad maddy Writeups Crypto
  14. zh3r0 2020 Crypto - We are related Writeups RSA
  15. zh3r0 2020 Crypto - Uncipher Me Writeups RSA
  16. zh3r0 2020 Crypto - RSA warmup Writeups RSA
  17. zh3r0 2020 Crypto - Mix Writeups Encoding
  18. zh3r0 2020 Crypto - Hastads Message Writeups RSA
  19. zh3r0 2020 Crypto - Double Fish Writeups Symmetric
  20. zh3r0 2020 Crypto - Analyze Me Writeups Classical
  21. Nahamcon 2020 Crypto - elsa4 Writeups Crypto
  22. Nahamcon 2020 Crypto - Unvreakable Vase Writeups Encoding
  23. Nahamcon 2020 Crypto - Twinning Writeups RSA
  24. Nahamcon 2020 Crypto - Raspberry Writeups RSA
  25. Nahamcon 2020 Crypto - Oo la la Writeups RSA
  26. Nahamcon 2020 Crypto - Homecooked Writeups Encoding
  27. Nahamcon 2020 Crypto - Docxor Writeups Crypto
  28. Nahamcon 2020 Crypto - December Writeups Symmetric
  29. RACTF 2020 Crypto - Really Speedy Algirithm Writeups RSA
  30. RACTF 2020 Crypto - Really Small Algorithm Writeups RSA
  31. RACTF 2020 Crypto - Really Simple Algorithm Writeups RSA
  32. RACTF 2020 Crypto - Really Secret Algorithm Writeups RSA
  33. RACTF 2020 Crypto - Mysterious Masquerading Message Writeups Encoding
  34. RACTF 2020 Crypto - Its as easy as access=0000 Writeups Symmetric
  35. RACTF 2020 Crypto - BOO7l3G CRYP70 Writeups Crypto
  36. RACTF 2020 Crypto - B007L36 CRYP70 A641N Writeups Crypto
  37. RACTF 2020 Crypto - 06 Writeups Classical
  38. RACTF 2020 Crypto - 05 Writeups Classical
  39. RACTF 2020 Crypto - 04 Writeups Classical
  40. RACTF 2020 Crypto - 03 Writeups Classical
  41. RACTF 2020 Crypto - 02 Writeups Classical
  42. RACTF 2020 Crypto - 01 Writeups Classical
  43. BATPWN 2020 Crypto - Prefixes Writeups Crypto
  44. BATPWN 2020 Crypto: M-ick Maybe Writeups Classical
  45. BATPWN 2020 Crypto - Cryptographer Writeups Crypto
  46. HSCTF 2020 Misc - N95 Writeups Crypto
  47. HSCTF 2020 Crypto - XKCD 2247 v2 Writeups Crypto
  48. HSCTF 2020 Crypto - XORed Writeups Crypto
  49. HSCTF 2020 Crypto - Unexpected Writeups RSA
  50. HSCTF 2020 Crypto - Smol E Writeups RSA
  51. HSCTF 2020 Crypto - Randomization 2 Writeups Crypto
  52. HSCTF 2020 Crypto - Randomization 1 Writeups Crypto
  53. HSCTF 2020 Crypto - Morbid Writeups Classical
  54. HSCTF 2020 Crypto - Extremely Complex Challenge Writeups ECC
  55. HSCTF 2020 Crypto - Chonky E Writeups RSA
  56. HSCTF 2020 Crypto - Affina and the quadratics Writeups Classical