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Add challenge
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s0phialiu committed Mar 12, 2024
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25 changes: 25 additions & 0 deletions chals/crypto/hidden-runes/challenge.yml
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name: "Hidden Runes"
author: Sophia
category: Crypto
description: |-
A capsule concealing a mysterious message has been discovered on the Main Quad.
You heard that those who decipher the message get to be featured in the Daily Illini!
Can you decrypt the following text?
**author**: Sophia
value: 150
type: dynamic
tags:
- easy
extra:
initial: 150
decay: 125
minimum: 100
flags:
- sigpwny{alphabets_are_very_fun}
files:
- mysterious_message.txt
hints:
- Substitution cipher with random characters
- Use context clues to figure out what common words translate to.
state: hidden
3 changes: 3 additions & 0 deletions chals/crypto/hidden-runes/mysterious_message.txt
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☉☾♄♄☿! ♀♂ ♃♆♀☾ ♇♅ ♀♆♃♈♉. ♇ ♄♉☽☾ ♅♊♆♋☾ ♆♃♌ ♆♄♊☉♆♍☾♎♅. ♇ ♏♆♃♎ ♎♉ ♈♉ ♎♉ ♅♊♆♋☾ ♉♃☾ ♌♆♂. ♇♃ ♎☉☾ ♀☾♆♃ ♎♇♀☾, ☉☾♐☾ ♇♅ ♎☉☾ ♑♄♆♈:
♅♇♈♊♏♃♂{♆♄♊☉♆♍☾♎♅_♆♐☾_☽☾♐♂_♑♒♃}

32 changes: 32 additions & 0 deletions chals/crypto/hidden-runes/solution.txt
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This is a substitution cipher.
♅♇♈♊♏♃♂ comes right before the set of braces {}, so we know that must stand for sigpwny.
Each character matches to a letter in the english alphabet.
We can spot words like "I", "is", and "the" and use the mappings to decipher the message.

Key:
☉ = h
☾ = e
♄ = l
☿ = o
♀ = m
♂ = y
♃ = n
♆ = a
♇ = I
♅ = s
☽ = v
♈ = g
♉ = o
♊ = p
♋ = c
♌ = d
♍ = b
♎ = t
♏ = w
♐ = r
♑ = f
♒ = u

Decoded message:
Hello! My name is Mango. I love space and alphabets. I want to go to space one day.
In the mean time, here is the flag: sigpwny{alphabets_are_very_fun}
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