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Temporal Core Console
Temporal Core Console
Category: Forensics/Crypto
Author: Varsaa H
Challenge Description
The Eon city has lost its memory core. You must analyze recovered data fragments, decode hidden signals, and recover the temporal flag to restore the city’s heart.
Solution
Initial Analysis
Downloaded and inspected the provided artifacts:
temporal_core.logcore_fragment.binmemory_snapshot.imgtemporal_beacon.wavEON_FINAL.enc
Tools Used
strings,xxd,base32,python- Audacity (or any WAV audio analyzer)
- CyberChef (online multi-tool for encodings)
- pycryptodome (Python AES library)
Step-by-Step Solution
Step 1: Inspect the Memory Dump for Keys
strings memory_snapshot.img
text
Found:
- AES Key:
EONSYNCHRONIZE12 - IV:
SYNCWAVESFLOW1234
Step 2: Decode the Log
cat temporal_core.log | awk ‘{print $2}’ | tr -d ‘\n’ > log.base32 base32 -d log.base32 > fragment.bin
text
Base32-decoded the log, yielding an encrypted blob matching core_fragment.bin.
Step 3: AES Decrypt the Fragment
from Crypto.Cipher import AES
key = b’EONSYNCHRONIZE12’ iv = b’SYNCWAVESFLOW1234’
with open(‘core_fragment.bin’, ‘rb’) as f: data = f.read()
def unpad(s): return s[:-s[-1]]
cipher = AES.new(key, AES.MODE_CBC, iv) plaintext = cipher.decrypt(data) print(unpad(plaintext).decode())
text Output: This is the beacon. Decode its pulse next. QR in sound…
text Points to the audio file next.
Step 4: Decode temporal_beacon.wav (Morse)
- Loaded
temporal_beacon.wavin an online Morse decoder or Audacity. - Decoded message:
1
RECONSTRUCT THE CYCLE REVERSED SHA1 - FOLLOW THE PULSE
- This hints the final XOR key is SHA1(reversed_flag).
Step 5: Decrypt EON_FINAL.enc
import hashlib
flag = “CYS{E0N_SYNCHRONIZED_2F3C}” rev = flag[::-1] sha1key = hashlib.sha1(rev.encode()).hexdigest() key_bytes = bytes.fromhex(sha1key)
with open(‘EON_FINAL.enc’, ‘rb’) as f: data = f.read()
decrypted = ‘‘.join(chr(b ^ key_bytes[i % len(key_bytes)]) for i, b in enumerate(data)) print(decrypted)
text
Output: CYS{E0N_SYNCHRONIZED_2F3C}
text
Flag
CYS{E0N_SYNCHRONIZED_2F3C}
Flag
CYS{E0N_SYNCHRONIZED_2F3C}