Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

86194374ad1f9b6d5fba33172e20a69e523c6223387af06f3f619e77c0044cb656d445f3eef5847fe8675d10cb5dab6341b0e4315237202416d447ceacda3704

Ciphertext (hexencoded):

86194374ad1f9b6d5fba33172e20a69e 523c6223387af06f3f619e77c0044cb6 56d445f3eef5847fe8675d10cb5dab63 41b0e4315237202416d447ceacda3704

Plaintext (hexencoded):

86194374ad1f9b6d5fba33172e20a69e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x86\x19Ct\xad\x1f\x9bm_\xba3\x17. \xa6\x9e {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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