Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1fd61bca8433ab7b50885dbc80653e18bc597a4cd5d7c72f080e03d5107bd4f46647ed8a8cd4d22d768fdd62bb6204f3d854aeb369a7f4e66b831e0ea34a054e

Ciphertext (hexencoded):

1fd61bca8433ab7b50885dbc80653e18 bc597a4cd5d7c72f080e03d5107bd4f4 6647ed8a8cd4d22d768fdd62bb6204f3 d854aeb369a7f4e66b831e0ea34a054e

Plaintext (hexencoded):

1fd61bca8433ab7b50885dbc80653e18 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1f\xd6\x1b\xca\x843\xab{P\x88]\xbc\x80e>\x18 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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