Challenge archive: zh3r0 CTF V2 2021 - chaos

Challenge: chaos
Event: zh3r0 CTF - 2021 (V2)
Year: 2021
Category: Cryptography
Authors: deuterium
Mode: interactive
Article: https://deut-erium.github.io/challenges/zh3r0-2021/chaos/
Text: https://deut-erium.github.io/challenges/zh3r0-2021/chaos/challenge.txt
JSON: https://deut-erium.github.io/challenges/zh3r0-2021/chaos/challenge.json

Original description:
Whats the fun rolling up a hash function if its not chaotic enough?

Notes:
- The handout omits the secret module. Browser practice uses a public dummy reward in place of the event flag; the original remote service is retired.
- The original remote service is retired. Browser practice runs locally with the public dummy reward practice{local_dummy_reward}, not an event flag or authoritative score. No TCP endpoint is provided.

Browser practice: https://deut-erium.github.io/challenges/zh3r0-2021/chaos/#browser-practice
Runtime: chaos
Variants: default (first is default)
Mode describes the original interactive I/O. Start practice from the article, not a TCP client.

Challenge files (primary):
- challenge.py (challenge.py; handout)
  URL: https://deut-erium.github.io/assets/challenges/zh3r0-2021-chaos/challenge.py
  Bytes: 1826
  SHA-256: b58529c8f5aa8d50bd38ab3ca595fcb65bf8ca00b4a2c235082811669fa95b8e
  Upstream provenance: https://raw.githubusercontent.com/zh3r0/zh3r0-ctf/7fd08591b088215d58aefdc3b0f64c4a9de80f5d/V2/crypto/chaos/public/challenge.py

Licenses (local copies):
No local license record is available for this entry.

SPOILERS - organizer files and solutions
Spoilers: organizer files and upstream source, archive, or solution links may reveal answers. Modified downloads are identified below.
Source: https://github.com/zh3r0/zh3r0-ctf/blob/7fd08591b088215d58aefdc3b0f64c4a9de80f5d/V2/crypto/chaos/readme.md#L5
Archive: https://github.com/zh3r0/zh3r0-ctf/tree/7fd08591b088215d58aefdc3b0f64c4a9de80f5d/V2/crypto/chaos
Solution: https://github.com/zh3r0/zh3r0-ctf/blob/7fd08591b088215d58aefdc3b0f64c4a9de80f5d/V2/crypto/chaos/admin/solve.py