Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

989fc02607a553e41743f8c7014c6348092ba9ffcc383fb25536c83d334146308f75fa9ec0fca1efc0b9c5986787920a114d8d7f630bbd39f3a46682e544873d

Ciphertext (hexencoded):

989fc02607a553e41743f8c7014c6348 092ba9ffcc383fb25536c83d33414630 8f75fa9ec0fca1efc0b9c5986787920a 114d8d7f630bbd39f3a46682e544873d

Plaintext (hexencoded):

989fc02607a553e41743f8c7014c6348 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x98\x9f\xc0&\x07\xa5S\xe4\x17C\xf8\xc7\x01LcH {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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