# PHDays CTF Quals 2k14 - Mp3 me (1400 points)

# hexdump -C ../123.mp3 | head -n 13
00000000  49 44 33 04 00 00 00 00  1f 76 54 52 43 4b 00 00  |ID3......vTRCK..|
00000010  00 09 00 00 01 ff fe 30  00 31 00 00 00 52 47 42  |.......0.1...RGB|
00000020  37 00 00 00 0d 00 00 03  35 2c 31 38 33 2c 20 4e  |7.......
5,183, N
|
00000030  55 4c 4c 00 52 47 42 36  00 00 00 0a 00 00 03 30  |
ULL
.RGB6.......
0
|
00000040  2c 34 32 2c 31 35 39 00  52 47 42 35 00 00 00 0c  |
,42,159
.RGB5....|
00000050  00 00 03 31 39 34 2c 32  34 34 2c 36 38 00 52 47  |...
194,244,68
.RG|
00000060  42 34 00 00 00 09 00 00  03 34 37 2c 37 37 2c 36  |B4.......
47,77,6
|
00000070  00 52 47 42 33 00 00 00  0b 00 00 03 34 34 2c 37  |.RGB3.......
44,7
|
00000080  33 2c 31 34 31 00 52 47  42 32 00 00 00 0c 00 00  |
3,141
.RGB2......|
00000090  03 31 34 30 2c 32 30 37  2c 37 32 00 52 47 42 31  |.
140,207,72
.RGB1|
000000a0  00 00 00 0d 00 00 03 31  32 30 2c 31 35 36 2c 32  |.......
120,156,2
|
000000b0  30 33 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |
03
..............|
000000c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
# cat mp3me.py
#!/usr/bin/python

from zlib import decompress

list = [120, 156, 203, 140, 207, 72, 44, 73, 141, 47, 77, 6, 194, 244, 68, 0, 42, 159, 5, 183]
code = ''

for byte in list:
 code += '%02x' % byte

print decompress(code.decode('hex'))
# ./mp3me.py
i_hate_ucucuga

References

http://en.wikipedia.org/wiki/ID3
http://www.ietf.org/rfc/rfc1950.txt