302 words
2 minutes
lactf{2025}
2025-02-09

LACTF 2025#

Danger Searching#

# Desc
My friend told me that they hiked on a trail that had 4 warning signs at the trailhead: Hazardous cliff, falling rocks, flash flood, AND strong currents! Could you tell me where they went? They did hint that these signs were posted on a public hawaiian hiking trail.
Note: the intended location has all 4 signs in the same spot. It is 4 permanent distinct signs - not 4 warnings on one sign or on a whiteboard.
Note: Feel free to try multiple plus codes. The answer skews roughly one "plus code tile" south/west of where many people think it is.
Flag is the full 10 digit [plus code](https://plus.codes/map) **containing the signs they are mentioning**, (e.g. lactf{85633HC3+9X} would be the flag for Bruin Bear Statue at UCLA). The plus code is in the URL when you select a location, or click the `^` at the bottom of the screen next to the short plus code to get the full length one. If your plus code contains 3 digits after the plus sign, zoom out and try selecting again.

Flag: ||lactf{73G66738+9C}||


Intended solution:#

  • You can find the list of public trails in hawaii in https://hawaiitrails.ehawaii.gov/trails/#/ where it allow you to filter the trails based on the warning of the trails, and if you put all 4 of the warning given, it shows only 1 trail with all of the warnings, which is Pololu trial and you can find the plus code from using the address.


Unintended Solution:#

  • Search for hawaiian hiking trail 4 danger signs
  • Found exact 4 title signs

  • Found the location and coordinates on google maps street view

  • Copy the Plus Code

  • After do some digging about Plus Code 10 digits, I found out that you can get the first 4 digits from https://plus.codes/map

PRO TIP: You can guess the last 2 digits… for more accuracy 73G66738+XX


VOILA

lactf{2025}
https://fuwari.vercel.app/posts/lactf-2025/
Author
Bakayang
Published at
2025-02-09
License
CC BY-NC-SA 4.0