Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

dc362a6e71e57c0f84a507e329ff0929f701db832d2bd1ba89310aca4dd130d30c17259f023606fc9f08944b246c21dbdc99b6cff7cef4d9643eab481b67d8cc

Ciphertext (hexencoded):

dc362a6e71e57c0f84a507e329ff0929 f701db832d2bd1ba89310aca4dd130d3 0c17259f023606fc9f08944b246c21db dc99b6cff7cef4d9643eab481b67d8cc

Plaintext (hexencoded):

dc362a6e71e57c0f84a507e329ff0929 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xdc6*nq\xe5|\x0f\x84\xa5\x07\xe3)\xff\t) {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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