Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

243e447bb8f3fa5c37dd3af3d8115a3efd743e55db133eb00a2d23e052526b6a36296745584e14d3fcd066fd0fc87125c24ea87e5bf439c4616b09e412b5d4c9

Ciphertext (hexencoded):

243e447bb8f3fa5c37dd3af3d8115a3e fd743e55db133eb00a2d23e052526b6a 36296745584e14d3fcd066fd0fc87125 c24ea87e5bf439c4616b09e412b5d4c9

Plaintext (hexencoded):

243e447bb8f3fa5c37dd3af3d8115a3e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

$>D{\xb8\xf3\xfa\\7\xdd:\xf3\xd8\x11Z> {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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