Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

c6928be37791908dd9d962ff109ccba47de5710430bb079beecf55cf8b5f8ccb9bbf3bf39d07db5e29dbece3ba8c022cdfd22490d61fedcc6cd620e7cd3ac046

Ciphertext (hexencoded):

c6928be37791908dd9d962ff109ccba4 7de5710430bb079beecf55cf8b5f8ccb 9bbf3bf39d07db5e29dbece3ba8c022c dfd22490d61fedcc6cd620e7cd3ac046

Plaintext (hexencoded):

c6928be37791908dd9d962ff109ccba4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc6\x92\x8b\xe3w\x91\x90\x8d\xd9\xd9b\xff\x10\x9c\xcb\xa4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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