Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

436bac26ee5d3f370672b205fcb031024f7025efb1fe0c715be034f0001517c0798c0ea7e6d8b9c803cc95ea8ef1c05e9ce8043cc297f2e670eb38a379c48a7b

Ciphertext (hexencoded):

436bac26ee5d3f370672b205fcb03102 4f7025efb1fe0c715be034f0001517c0 798c0ea7e6d8b9c803cc95ea8ef1c05e 9ce8043cc297f2e670eb38a379c48a7b

Plaintext (hexencoded):

436bac26ee5d3f370672b205fcb03102 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

Ck\xac&\xee]?7\x06r\xb2\x05\xfc\xb01\x02 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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