Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1a11f49e48bb19e008144dba4bb6f077b79e0b2a9117226080f9b11eed51457519349c064a2569140d0d11d19f0af671a75ae4f430f786576da68fc4ebd02627

Ciphertext (hexencoded):

1a11f49e48bb19e008144dba4bb6f077 b79e0b2a9117226080f9b11eed514575 19349c064a2569140d0d11d19f0af671 a75ae4f430f786576da68fc4ebd02627

Plaintext (hexencoded):

1a11f49e48bb19e008144dba4bb6f077 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1a\x11\xf4\x9eH\xbb\x19\xe0\x08\x14M\xbaK\xb6\xf0w {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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