Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

a0d77f110b867a84f40b5bb0f97bc19c0c5f6754089a8396d02b50397aeb2ce0a0cd559dcbedfa7f55691c2a15c03048af25d7374aeef43df6c0f8e3e155d4d4

Ciphertext (hexencoded):

a0d77f110b867a84f40b5bb0f97bc19c 0c5f6754089a8396d02b50397aeb2ce0 a0cd559dcbedfa7f55691c2a15c03048 af25d7374aeef43df6c0f8e3e155d4d4

Plaintext (hexencoded):

a0d77f110b867a84f40b5bb0f97bc19c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa0\xd7\x7f\x11\x0b\x86z\x84\xf4\x0b[\xb0\xf9{\xc1\x9c {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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