Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d17ac5c7d4883964c8e97bd4cce466c9caabe2eb9eaebf9a10b87129c2e8515a495e2c7907fc92358bd4394d8ff046eada924dab059822d611700a0b57598a3e

Ciphertext (hexencoded):

d17ac5c7d4883964c8e97bd4cce466c9 caabe2eb9eaebf9a10b87129c2e8515a 495e2c7907fc92358bd4394d8ff046ea da924dab059822d611700a0b57598a3e

Plaintext (hexencoded):

d17ac5c7d4883964c8e97bd4cce466c9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd1z\xc5\xc7\xd4\x889d\xc8\xe9{\xd4\xcc\xe4f\xc9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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