Block cipher challenge

Level: CTR mode

Sorry, you're not an admin (need is_admin: true)



Ciphertext (hexencoded), for easy copy-paste

82df21cabd133549c93a5a0f8194543f78a27f6eeaeb2ba4ad4619ce1182f49911206d83d6ed6d0eecf3ec5ee419a51b021631a137e035283af02c89b00dc820

Ciphertext (hexencoded):

82df21cabd133549c93a5a0f8194543f 78a27f6eeaeb2ba4ad4619ce1182f499 11206d83d6ed6d0eecf3ec5ee419a51b 021631a137e035283af02c89b00dc820

Plaintext (hexencoded):

82df21cabd133549c93a5a0f8194543f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x82\xdf!\xca\xbd\x135I\xc9:Z\x0f\x81\x94T? {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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