Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

3e9ac0d7c04a21dcffdea9c17474562cd99f55094df80a54d8dd82f9b2df813ee874cb7900f47a56bef44ac33ffed3f840fa5b0573b9247772d1941146a51c86

Ciphertext (hexencoded):

3e9ac0d7c04a21dcffdea9c17474562c d99f55094df80a54d8dd82f9b2df813e e874cb7900f47a56bef44ac33ffed3f8 40fa5b0573b9247772d1941146a51c86

Plaintext (hexencoded):

3e9ac0d7c04a21dcffdea9c17474562c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

>\x9a\xc0\xd7\xc0J!\xdc\xff\xde\xa9\xc1ttV, {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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