Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3018f245f7c602c14674084ac9e5eaa8c47395b1723b92aaaa1ca6c07762b3855bae91f8c6aa367ee300df94750336eb492cd8aa69f60f56d9a76b57a9585666

Ciphertext (hexencoded):

3018f245f7c602c14674084ac9e5eaa8 c47395b1723b92aaaa1ca6c07762b385 5bae91f8c6aa367ee300df94750336eb 492cd8aa69f60f56d9a76b57a9585666

Plaintext (hexencoded):

3018f245f7c602c14674084ac9e5eaa8 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

0\x18\xf2E\xf7\xc6\x02\xc1Ft\x08J\xc9\xe5\xea\xa8 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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