Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

03d736e379d9edf31817e8b517621d2dc28cdd15ca376043e0c9bdeadb1aeba56419d67a51209bbd29e2992f2b99753da8cb6da856236820dfb7047bc5056068

Ciphertext (hexencoded):

03d736e379d9edf31817e8b517621d2d c28cdd15ca376043e0c9bdeadb1aeba5 6419d67a51209bbd29e2992f2b99753d a8cb6da856236820dfb7047bc5056068

Plaintext (hexencoded):

03d736e379d9edf31817e8b517621d2d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x03\xd76\xe3y\xd9\xed\xf3\x18\x17\xe8\xb5\x17b\x1d- {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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