Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

7dee94a90375a601428e05ee96de871c3d55681c6cb5c3aef5143a34d32112b63dcefecab4607320c34f1e4e018843c95390c32189f8f658c543ba9738887dd1

Ciphertext (hexencoded):

7dee94a90375a601428e05ee96de871c 3d55681c6cb5c3aef5143a34d32112b6 3dcefecab4607320c34f1e4e018843c9 5390c32189f8f658c543ba9738887dd1

Plaintext (hexencoded):

7dee94a90375a601428e05ee96de871c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

}\xee\x94\xa9\x03u\xa6\x01B\x8e\x05\xee\x96\xde\x87\x1c {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

{"username": "guest", "is_guest": true}