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Lost Core Pulse
Lost Core Pulse
- Category: Crypto
- Author: Varsaa H
Challenge Description
The Eon city’s memory pulse went missing in a turbulent transmission. What remains in cipher.txt is cloaked with layers recognizable only to cryptographers—and those attentive to the patterns of Eon’s lost pulse.
Hint: Sometimes, signals are wrapped not once but twice.
Solution
Initial Analysis
- Downloaded and inspected the file
cipher.txt. - The content was a long string of what looked like hexadecimal characters.
Tools Used
- Python (hex and base64 decoding)
- CyberChef (for alternate handy decoding)
- Any text editor
Step-by-Step Solution
Step 1: Hex Decode the cipher.txt
with open(‘cipher.txt’) as f: data = bytes.fromhex(f.read()) print(data)
This produced a result that looked like base64: b’Q1lTezNiYjEyZGF9b3N0cHVsc2VFOTFiZTJkZTFkZjQ=’
Step 2: Base64 Decode the Result
import base64 flag = base64.b64decode(data).decode() print(flag)
text Output: CYS{3bb12d_lostpulse_91be2d}
This is the flag, revealed from the two encoding layers.
Flag
CYS{3bb12d_lostpulse_91be2d}
Flag
CYS{3bb12d_lostpulse_91be2d}