Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d1a6cc32876a66b76adb066e1fb2d9f050929de2e9788316311c05e39fb8369ca00964221e05149d832dd80c2503871b826aebb15efbf1c6f7d518b23864deff

Ciphertext (hexencoded):

d1a6cc32876a66b76adb066e1fb2d9f0 50929de2e9788316311c05e39fb8369c a00964221e05149d832dd80c2503871b 826aebb15efbf1c6f7d518b23864deff

Plaintext (hexencoded):

d1a6cc32876a66b76adb066e1fb2d9f0 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd1\xa6\xcc2\x87jf\xb7j\xdb\x06n\x1f\xb2\xd9\xf0 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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