Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b6ed715438fcf75a5c9d1cd229996f5533ccfc6473c21edc40e0400287ca76c655391bd649b22f7a7b1f0d5fafd2a8fb4e3fdbf8e95c7407b4d81488715675db

Ciphertext (hexencoded):

b6ed715438fcf75a5c9d1cd229996f55 33ccfc6473c21edc40e0400287ca76c6 55391bd649b22f7a7b1f0d5fafd2a8fb 4e3fdbf8e95c7407b4d81488715675db

Plaintext (hexencoded):

b6ed715438fcf75a5c9d1cd229996f55 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb6\xedqT8\xfc\xf7Z\\\x9d\x1c\xd2)\x99oU {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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