Can you help us retreive the flag from this crypto service? Connect with
nc 2018shell.picoctf.com 24933. We were able to recover some Source Code.
Port may be different.
Paddding Oracle Attack
TODO (see script comments)
Simply run padding.py and insert port to which to connect:
$ python padding.py
picoCTF port: 24933
5 blocks of 16 bytes.
Block 5 of ciphertext: 00000000000000000000000000000000
Retrieving block 4 of ciphertext...
Byte 16: 0x24
Byte 15: 0x6c
...
...
Byte 2: 0xdf
Byte 1: 0x43
Block 1 of ciphertext: [40, 242, 142, 183, 142, 136, 242, 147, 104, 210, 173, 177, 252, 243, 155, 240]
Ciphertext: 28f28eb78e88f29368d2adb1fcf39bf061ea7ba267c562e51c4a2cc8b910b194f6f9a97bcc224d04c050abd512f721f700aa911a4da9e8ef474f2e48deac6d2600000000000000000000000000000000
Flag: picoCTF{0r4cl3s_c4n_l34k_ae6a1459}