Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

5f2916350a69568e5cab00088e453f2544dd03dc1f55db7c39d746b89f74be8d5a8ad958eaf16d97571f1d751acdc8ddabb9481b125ae8e49168a4c6e3868928

Ciphertext (hexencoded):

5f2916350a69568e5cab00088e453f25 44dd03dc1f55db7c39d746b89f74be8d 5a8ad958eaf16d97571f1d751acdc8dd abb9481b125ae8e49168a4c6e3868928

Plaintext (hexencoded):

5f2916350a69568e5cab00088e453f25 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

_)\x165\niV\x8e\\\xab\x00\x08\x8eE?% {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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