Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

4b9d837f73da594468cbf1208da486a9a2bd8ce8ea537d3302a08f484cfdc06c6494b9120d30d4e18ccdea1292fd2ae199bf9cb19d7625eda70059f4117144ed

Ciphertext (hexencoded):

4b9d837f73da594468cbf1208da486a9 a2bd8ce8ea537d3302a08f484cfdc06c 6494b9120d30d4e18ccdea1292fd2ae1 99bf9cb19d7625eda70059f4117144ed

Plaintext (hexencoded):

4b9d837f73da594468cbf1208da486a9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

K\x9d\x83\x7fs\xdaYDh\xcb\xf1 \x8d\xa4\x86\xa9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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