Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

8b181126d42954c46075739faf36f54cf54dc75976cdaba118cfc1175e306518144ed719d534bfa35823560f5b235bb11a8290e8e9448a7a5f27f1b1615c1619

Ciphertext (hexencoded):

8b181126d42954c46075739faf36f54c f54dc75976cdaba118cfc1175e306518 144ed719d534bfa35823560f5b235bb1 1a8290e8e9448a7a5f27f1b1615c1619

Plaintext (hexencoded):

8b181126d42954c46075739faf36f54c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x8b\x18\x11&\xd4)T\xc4`us\x9f\xaf6\xf5L {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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