Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

97bb50fb2d8e1353a8c042474ad63d25345430eaad68e234d7efddaa4703dfa69aa0c17d4ff4e6e042a4003ec9aa23f815aedd91e5d7ba187fe8b4a2c92a94a4

Ciphertext (hexencoded):

97bb50fb2d8e1353a8c042474ad63d25 345430eaad68e234d7efddaa4703dfa6 9aa0c17d4ff4e6e042a4003ec9aa23f8 15aedd91e5d7ba187fe8b4a2c92a94a4

Plaintext (hexencoded):

97bb50fb2d8e1353a8c042474ad63d25 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x97\xbbP\xfb-\x8e\x13S\xa8\xc0BGJ\xd6=% {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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