rrrgggbbb
rgb低位隐写，分别在三个图片中的rgb最低位找到了bpg的图片16进制数据，编写python脚本提取
r = open("r","rb").read()
g = open("g","rb").read()
b = open("b","rb").read()
length = len(r)
print(len(r),len(g),len(b))
file = open("flag","wb+")
for i in range(length):
file.write(r[i].to_bytes(1,byteorder='little',signed=False))
file.write(g[i].to_bytes(1,byteorder='little',signed=False))
file.write(b[i].to_bytes(1,byteorder='little',signed=False))
file.close()
使用bpgdec转成png，不知道为什么我bpg打开没反应
