Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

66e6af1653ac9a9b137b0d0518938218de0d2885c96ec1339d7740bf2ba95c9b99b689ac5482282fc49958bc794a17929e2f194651f3a1ccd1051c8c75d0ba34

Ciphertext (hexencoded):

66e6af1653ac9a9b137b0d0518938218 de0d2885c96ec1339d7740bf2ba95c9b 99b689ac5482282fc49958bc794a1792 9e2f194651f3a1ccd1051c8c75d0ba34

Plaintext (hexencoded):

66e6af1653ac9a9b137b0d0518938218 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

f\xe6\xaf\x16S\xac\x9a\x9b\x13{\r\x05\x18\x93\x82\x18 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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