Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

8a2bb24c70d053d3a6fe11e0a7f87325ed1e6739a7980aaae8e065069254dc1f1dd33c3f943be0e72bac1ade45e5c0ab9a200c305797b19b9c639dfc16af9a46

Ciphertext (hexencoded):

8a2bb24c70d053d3a6fe11e0a7f87325 ed1e6739a7980aaae8e065069254dc1f 1dd33c3f943be0e72bac1ade45e5c0ab 9a200c305797b19b9c639dfc16af9a46

Plaintext (hexencoded):

8a2bb24c70d053d3a6fe11e0a7f87325 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x8a+\xb2Lp\xd0S\xd3\xa6\xfe\x11\xe0\xa7\xf8s% {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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