Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

fc95be28a4ca775dd00e493f60b0d91bcb044a6592badcda072dba348bc865d1e12cab75a8fbb78a98306f0dccbf56ebe73b1ff17b8d1bcbdfd0422435948c9a

Ciphertext (hexencoded):

fc95be28a4ca775dd00e493f60b0d91b cb044a6592badcda072dba348bc865d1 e12cab75a8fbb78a98306f0dccbf56eb e73b1ff17b8d1bcbdfd0422435948c9a

Plaintext (hexencoded):

fc95be28a4ca775dd00e493f60b0d91b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xfc\x95\xbe(\xa4\xcaw]\xd0\x0eI?`\xb0\xd9\x1b {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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