Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

1b3d77ce32579d3b3e2174d914a09e5af98f52c289a30c93ca676f127da524432a7d503f2e934e43a0e27c514a3adb7e8b59f1efbf826d3fc6671c8fa1265448

Ciphertext (hexencoded):

1b3d77ce32579d3b3e2174d914a09e5a f98f52c289a30c93ca676f127da52443 2a7d503f2e934e43a0e27c514a3adb7e 8b59f1efbf826d3fc6671c8fa1265448

Plaintext (hexencoded):

1b3d77ce32579d3b3e2174d914a09e5a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1b=w\xce2W\x9d;>!t\xd9\x14\xa0\x9eZ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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