Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

2ab0e3594e03f6e6cb94e89975ea029c13badf5a9360c36907e80c0259497ec622ab16ab8ff1c466d07ae62bdb59d983d76f4ea0baeb807b86aa155e38df1c07

Ciphertext (hexencoded):

2ab0e3594e03f6e6cb94e89975ea029c 13badf5a9360c36907e80c0259497ec6 22ab16ab8ff1c466d07ae62bdb59d983 d76f4ea0baeb807b86aa155e38df1c07

Plaintext (hexencoded):

2ab0e3594e03f6e6cb94e89975ea029c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

*\xb0\xe3YN\x03\xf6\xe6\xcb\x94\xe8\x99u\xea\x02\x9c {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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