羊城杯WP

发布时间 : 2024-08-28 00:55

hiden wav
不一样的数据库_2

Lyrics For You

hiden wav

rot47+rot13解密后得到隐藏flag在wav文件中的脚本

import wave 

with open('flag.txt', 'rb') as f:
    txt_data = f.read()
    file_len = len(txt_data)
    txt_data = file_len.to_bytes(3, byteorder = 'little') + txt_data

with wave.open("test.wav", "rb") as f:
    attrib = f.getparams()    
    wav_data = bytearray( f.readframes(-1) )

for index in range(len(txt_data)):
    wav_data[index * 4] = txt_data[index]
    
with wave.open("hiden.wav", "wb") as f:
    f.setparams(attrib) 
    f.writeframes(wav_data)

根据加密的脚本询问下gpt跑出解密的脚本

得到flag

import wave

# Open the WAV file in read mode
with wave.open("hiden.wav", "rb") as f:
    attrib = f.getparams()
    wav_data = bytearray(f.readframes(-1))

# Extract the hidden data from the WAV file
hidden_data = bytes([wav_data[i] for i in range(0, len(wav_data), 4)])

# The first three bytes represent the length of the original text data
original_length = int.from_bytes(hidden_data[:3], byteorder='little')
txt_data = hidden_data[3:3+original_length]

# Write the extracted data to a new text file
with open('extracted_flag.txt', 'wb') as f:
    f.write(txt_data)

print("The flag has been extracted and saved to 'extracted_flag.txt'.")

ok，now you find me,so the flag give you

DASCTF{12jkl-456m78-90n1234}