Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b0ddb1783e3d8ba53afce3e75cfa0aba1b83d925e76cb84f357392e8f8fdeaa8ca79378a2915f4d0811eba228d1ee1bb4f88b3eb50308429904f203941fae4b8

Ciphertext (hexencoded):

b0ddb1783e3d8ba53afce3e75cfa0aba 1b83d925e76cb84f357392e8f8fdeaa8 ca79378a2915f4d0811eba228d1ee1bb 4f88b3eb50308429904f203941fae4b8

Plaintext (hexencoded):

b0ddb1783e3d8ba53afce3e75cfa0aba 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb0\xdd\xb1x>=\x8b\xa5:\xfc\xe3\xe7\\\xfa\n\xba {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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