Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1bbe9076ca3060640d1466aebb580cdc41ec5011e783b8e076493717efbf25d49f29f90bd8f3595c58989d568cbb8b79708a3112deaba599c8d14b1dfdd7a3b1

Ciphertext (hexencoded):

1bbe9076ca3060640d1466aebb580cdc 41ec5011e783b8e076493717efbf25d4 9f29f90bd8f3595c58989d568cbb8b79 708a3112deaba599c8d14b1dfdd7a3b1

Plaintext (hexencoded):

1bbe9076ca3060640d1466aebb580cdc 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1b\xbe\x90v\xca0`d\r\x14f\xae\xbbX\x0c\xdc {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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