Hard Live

Christmas Tree Hash

100 points

47 Solves

Programming

Hard

adapap

Community Rating: 4.87 / 5

As Christmas approaches, Adam decides that he wants to improve his network security. He is inspired by the nearly identical Christmas Trees in his office with the only difference being the number on the star on top, and writes a hash function to generate a key. His instructions are found here: https://mega.nz/#!vawiwIBL!MNh3kyh12f_V8xtpHVCiBz5svr7Npvdhu6uzUkS08Tg - The trees in Adam's office can be found here (your input): https://mega.nz/#!PGw2SCDZ!yzI2DCX0ut-TR5WBDX2x_aqtNQezg9WTGcxcmHlNJNs - What is the encryption key generated by Adam's Christmas Tree Hash function?

First 10 Solvers

Rank Username
1 kronos
2 kalilo
3 Yeraisci
4 bakudanichi
5 intelagent moderator badge ctflearn++ badge
Rank Username
6 tenchijin
7 Anony
8 freimer
9 nh4ntz
10 thebadgod

  • IronLarreh_

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  • airr

    Could someone explain me step 6

    • emo94

      try this in python: k = pow(365, 5) + pow(52, 10) + pow(7, 20) + 457981573849226022 - int(result) k = -k

  • Raffy

    Step 6 (line 34 of text1.txt) is confusing, the value you should be subtracting is 365^5 + 52^10 + 7^20 + 457981573849226022 (notice the last plus sign instead of the minus). Otherwise, good job.

  • IT_Oracle

    That was a fun programming challenge! Also, that flag made me do a double take and then made me laugh pretty hard, lmao. Thanks for the challenge!

  • Gilad

    Any hint about step 7 - how to convert -682335424444623097 to uehcysuxjh? I've already tried several conversions of -682335424444623097 to other values

    • Gilad

      never mind - I've found how to convert