Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

31fe1359e9ee766a8429cf1b3edc37cbf3ec2068de3bd5d528868ebab834daef50a6aa91184016a7de045a23314706bca3f40c7363595e464c51442094b81310

Ciphertext (hexencoded):

31fe1359e9ee766a8429cf1b3edc37cb f3ec2068de3bd5d528868ebab834daef 50a6aa91184016a7de045a23314706bc a3f40c7363595e464c51442094b81310

Plaintext (hexencoded):

31fe1359e9ee766a8429cf1b3edc37cb 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

1\xfe\x13Y\xe9\xeevj\x84)\xcf\x1b>\xdc7\xcb {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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