Collision — digest evidence
A digest challenge asks you to reason about two inputs that produce the same short training digest. The page gives the complete bounded fixture.
DIGEST FIXTURE
input A: northstar|7
input B: northstar|7
training digest width: 16 bits
observation: the fixture deliberately demonstrates a collision domain
Attribution: Adapted from Crate-CTF, 2025 challenge “Collision” by Mathias. Used under the MIT License; flags and secrets were replaced for GisVuln. See source and license details.
This GisVuln adaptation is self-contained and does not contact the original challenge infrastructure.