Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

843c317e13bdfc1e6837fa013bf88d2abb3dc0a12e8706b970e338664492e0e5cc029ceb01abe35b5f2a93796745a66862908b0c707bfb5d58fa801491bc9426

Ciphertext (hexencoded):

843c317e13bdfc1e6837fa013bf88d2a bb3dc0a12e8706b970e338664492e0e5 cc029ceb01abe35b5f2a93796745a668 62908b0c707bfb5d58fa801491bc9426

Plaintext (hexencoded):

843c317e13bdfc1e6837fa013bf88d2a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x84<1~\x13\xbd\xfc\x1eh7\xfa\x01;\xf8\x8d* {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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