Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

a951ee3cdd72b22efdb2baf0252543bf0c82787a979c27275fd16502fe1f44f54f9c9a2f58a5b2453715db026962bf421c5d69ebbc9deb0d56ac97ff9b75c538

Ciphertext (hexencoded):

a951ee3cdd72b22efdb2baf0252543bf 0c82787a979c27275fd16502fe1f44f5 4f9c9a2f58a5b2453715db026962bf42 1c5d69ebbc9deb0d56ac97ff9b75c538

Plaintext (hexencoded):

a951ee3cdd72b22efdb2baf0252543bf 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa9Q\xee<\xddr\xb2.\xfd\xb2\xba\xf0%%C\xbf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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