Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f53451cee779b8f3c4561c14006ccca19a77883220abc3a67595ed69f09bb2be20eb788f9f039b9251a04492f7889cfba678f60d6b6b88ba6237cad66d6fc604

Ciphertext (hexencoded):

f53451cee779b8f3c4561c14006ccca1 9a77883220abc3a67595ed69f09bb2be 20eb788f9f039b9251a04492f7889cfb a678f60d6b6b88ba6237cad66d6fc604

Plaintext (hexencoded):

f53451cee779b8f3c4561c14006ccca1 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf54Q\xce\xe7y\xb8\xf3\xc4V\x1c\x14\x00l\xcc\xa1 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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