Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1760e8b3d2e382a12ce3dc09dffc616ac78e1cf152309b943bcf9f2c1e078fdd9afe19c971a99c450734fe32bcfd262240f863b6e9106a1e14e0f8540be735a9

Ciphertext (hexencoded):

1760e8b3d2e382a12ce3dc09dffc616a c78e1cf152309b943bcf9f2c1e078fdd 9afe19c971a99c450734fe32bcfd2622 40f863b6e9106a1e14e0f8540be735a9

Plaintext (hexencoded):

1760e8b3d2e382a12ce3dc09dffc616a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x17`\xe8\xb3\xd2\xe3\x82\xa1,\xe3\xdc\t\xdf\xfcaj {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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