Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ac3980c8169659a31e611a48aa8d3f231e3d64b7b175aa89a1de282a13c0029e840c63d8e112eaad544a99d36a034ee2e3b954d26bd110de281f592b8aebc5b2

Ciphertext (hexencoded):

ac3980c8169659a31e611a48aa8d3f23 1e3d64b7b175aa89a1de282a13c0029e 840c63d8e112eaad544a99d36a034ee2 e3b954d26bd110de281f592b8aebc5b2

Plaintext (hexencoded):

ac3980c8169659a31e611a48aa8d3f23 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xac9\x80\xc8\x16\x96Y\xa3\x1ea\x1aH\xaa\x8d?# {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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