Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

a465149d462b3772cdb31c2478f87cb26f5d9c9330a829184c21182d5d89a0e8895d23a5f0c6de8ced08efb3fb3e61f2c6768596d7ee5efe5727a91ae0e0a3fb

Ciphertext (hexencoded):

a465149d462b3772cdb31c2478f87cb2 6f5d9c9330a829184c21182d5d89a0e8 895d23a5f0c6de8ced08efb3fb3e61f2 c6768596d7ee5efe5727a91ae0e0a3fb

Plaintext (hexencoded):

a465149d462b3772cdb31c2478f87cb2 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa4e\x14\x9dF+7r\xcd\xb3\x1c$x\xf8|\xb2 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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