Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f4b92364d2e2fc30b5f3c92c7323dc70e0b5210787e2e228cdfd656788f48d5bf9c23822d21f2ecf195472b8c7900fe8892650c6d2e9e4283458fa0bf62ca8ce

Ciphertext (hexencoded):

f4b92364d2e2fc30b5f3c92c7323dc70 e0b5210787e2e228cdfd656788f48d5b f9c23822d21f2ecf195472b8c7900fe8 892650c6d2e9e4283458fa0bf62ca8ce

Plaintext (hexencoded):

f4b92364d2e2fc30b5f3c92c7323dc70 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf4\xb9#d\xd2\xe2\xfc0\xb5\xf3\xc9,s#\xdcp {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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