pico2026 timestamped secrets

Given a Python encryption program, create the program which decrypts the file.

from hashlib import sha256
from Crypto.Cipher import AES
from Crypto.Util.Padding import unpad

def decrypt(ciphertext_hex: str, timestamp: int) -> str:
# Recreate the same key derivation used in encryption
key = sha256(str(timestamp).encode()).digest()[:16]

cipher = AES.new(key, AES.MODE_ECB)

ciphertext = bytes.fromhex(ciphertext_hex)
padded_plaintext = cipher.decrypt(ciphertext)

# Remove PKCS7 padding
plaintext = unpad(padded_plaintext, AES.block_size)

return plaintext.decode()
if __name__ == "__main__":
ciphertext_hex = "FILLMEIN"
timestamp = FILLMEIN

result = decrypt(ciphertext_hex, timestamp)
print("Decrypted plaintext:", result)

Видео pico2026 timestamped secrets канала Martin Carlisle