Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f9d9a19060d3d95734cdce158d57c377b3c9dbde5254650458f0fff55caeac5084fb393e4a10d62ca7555d2110e026caed08b179bb6ece35c155ad273656f644

Ciphertext (hexencoded):

f9d9a19060d3d95734cdce158d57c377 b3c9dbde5254650458f0fff55caeac50 84fb393e4a10d62ca7555d2110e026ca ed08b179bb6ece35c155ad273656f644

Plaintext (hexencoded):

f9d9a19060d3d95734cdce158d57c377 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf9\xd9\xa1\x90`\xd3\xd9W4\xcd\xce\x15\x8dW\xc3w {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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