🪣
_voidCTF - Write Ups
  • results for bucketCTF 23
  • Web
    • Ping check
    • Gif
  • Crypto
    • Search-0
    • Search-1
    • TBDLCG
  • AI
    • Codewriter 1
    • Codewriter 2
    • Codewriter 3
    • LLMagic 1
    • LLMagic 2
    • LLMagic 3
  • Rev
    • Random security
    • Apps
  • Pwn
    • Never Called
    • Starting place
  • Misc
    • Transmission
    • Minecraft
    • Minecraft 2
    • Image 2
    • Discord
    • Survey
Powered by GitBook
On this page

Was this helpful?

  1. Crypto

TBDLCG

CRYPTO EASY - 200

PreviousSearch-1NextCodewriter 1

Last updated 1 year ago

Was this helpful?

Description

I created a tennis game. BLAHFALJFAJDFLBLAHAOIFLJFDA - is that random enough for you?

We are given an IP address which we connect to using netcat. There is a game where you need to guess the Bot's tennis ball spin and location in order to win a point, whoever gets to 5 points first wins.

First i let the bot get 4 points by just putting 1 and 1 everytime to try to find a pattern in the bots shots. That seemed to be helpful as i notice a pattern of the balls location cycling through numbers 6, 0 and 3 everytime, aswell as the spin, which kept cycling the numbers 8, 5 and 2

Since the bot last location was 6 and the spin was 8, i use the location 0 and 5 spin and get a point. Now I just keep repeating until getting 5 points and get the flag.

The pattern
Page cover image