Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

49aca678b70fd8f04bfca379b623a2fc8dd631b748f1323112b8b9fed876d6e801751bca5f0dc88e46ac47faa60ec8c370c0d6b0a0a9c01254ec70000fc7aa74

Ciphertext (hexencoded):

49aca678b70fd8f04bfca379b623a2fc 8dd631b748f1323112b8b9fed876d6e8 01751bca5f0dc88e46ac47faa60ec8c3 70c0d6b0a0a9c01254ec70000fc7aa74

Plaintext (hexencoded):

49aca678b70fd8f04bfca379b623a2fc 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

I\xac\xa6x\xb7\x0f\xd8\xf0K\xfc\xa3y\xb6#\xa2\xfc {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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