Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b4125ef1c0da543e58f1b38e76546dd81812494f8a2cc6de38d925ac40abb54dc2be28e161792cf382df0141dd80b834ae1bde9add0bc38cbcac3690fe066dd3

Ciphertext (hexencoded):

b4125ef1c0da543e58f1b38e76546dd8 1812494f8a2cc6de38d925ac40abb54d c2be28e161792cf382df0141dd80b834 ae1bde9add0bc38cbcac3690fe066dd3

Plaintext (hexencoded):

b4125ef1c0da543e58f1b38e76546dd8 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb4\x12^\xf1\xc0\xdaT>X\xf1\xb3\x8evTm\xd8 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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