Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

8b180bbc98c56dca34be1c82bc31d7b529c3ff12ff7cf06e656086295953f576284a204c13487f1b7d555ef86ed89595942639c9d2deb693ef58b4d14ee7ed4d

Ciphertext (hexencoded):

8b180bbc98c56dca34be1c82bc31d7b5 29c3ff12ff7cf06e656086295953f576 284a204c13487f1b7d555ef86ed89595 942639c9d2deb693ef58b4d14ee7ed4d

Plaintext (hexencoded):

8b180bbc98c56dca34be1c82bc31d7b5 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x8b\x18\x0b\xbc\x98\xc5m\xca4\xbe\x1c\x82\xbc1\xd7\xb5 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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