Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

66accf9ca66255617ec837ac5418e9674951d122643fbd12f522ac888bb52dae674e71344aef7c6c50408a51e93bc2de93066109c32b5b3dbdae449f936610df

Ciphertext (hexencoded):

66accf9ca66255617ec837ac5418e967 4951d122643fbd12f522ac888bb52dae 674e71344aef7c6c50408a51e93bc2de 93066109c32b5b3dbdae449f936610df

Plaintext (hexencoded):

66accf9ca66255617ec837ac5418e967 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

f\xac\xcf\x9c\xa6bUa~\xc87\xacT\x18\xe9g {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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