Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

463a8d8075efe24d03b1abe35923d6898113f776fb27b7662abe09f339dc4477e7d6a36975abb56dd669fa3e54e31398dff5c4207c58da6d9c4bac7dc1f7d785

Ciphertext (hexencoded):

463a8d8075efe24d03b1abe35923d689 8113f776fb27b7662abe09f339dc4477 e7d6a36975abb56dd669fa3e54e31398 dff5c4207c58da6d9c4bac7dc1f7d785

Plaintext (hexencoded):

463a8d8075efe24d03b1abe35923d689 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

F:\x8d\x80u\xef\xe2M\x03\xb1\xab\xe3Y#\xd6\x89 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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