Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

c112568467f811278780490d29f66e7145fbd3b126b9cdd71a4f4bb95f7b24f734e1df2cd8799630480e15f87206d429ca7dae2b800e6f11a30beaa281d6a047

Ciphertext (hexencoded):

c112568467f811278780490d29f66e71 45fbd3b126b9cdd71a4f4bb95f7b24f7 34e1df2cd8799630480e15f87206d429 ca7dae2b800e6f11a30beaa281d6a047

Plaintext (hexencoded):

c112568467f811278780490d29f66e71 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc1\x12V\x84g\xf8\x11\'\x87\x80I\r)\xf6nq {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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