Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

62105e088afea5a8971a34980d2ff675fa7e0f4821f0f287e16dc6c0de6e13e1623d8302300059cea4e9a888c3a1e232f17906c6e7fe110b9d428f4489d24f5f

Ciphertext (hexencoded):

62105e088afea5a8971a34980d2ff675 fa7e0f4821f0f287e16dc6c0de6e13e1 623d8302300059cea4e9a888c3a1e232 f17906c6e7fe110b9d428f4489d24f5f

Plaintext (hexencoded):

62105e088afea5a8971a34980d2ff675 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

b\x10^\x08\x8a\xfe\xa5\xa8\x97\x1a4\x98\r/\xf6u {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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