Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

5bd7e0cbe0f2c549e31b307ed8c0435989f88696e3c9fd511fb0b0224ab79a26082799d31447765e89a61223023ac3cef2bb0b076bd2dec91326619175441a7a

Ciphertext (hexencoded):

5bd7e0cbe0f2c549e31b307ed8c04359 89f88696e3c9fd511fb0b0224ab79a26 082799d31447765e89a61223023ac3ce f2bb0b076bd2dec91326619175441a7a

Plaintext (hexencoded):

5bd7e0cbe0f2c549e31b307ed8c04359 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

[\xd7\xe0\xcb\xe0\xf2\xc5I\xe3\x1b0~\xd8\xc0CY {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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