Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

51235741798171edfc243dd3c06b5933e2ebaec5ba5699b378da32e45d32c3c7af1eaa84704ba330c2f52f64d5cf99eead7b9b456a5e6790788a9195c7a810c2

Ciphertext (hexencoded):

51235741798171edfc243dd3c06b5933 e2ebaec5ba5699b378da32e45d32c3c7 af1eaa84704ba330c2f52f64d5cf99ee ad7b9b456a5e6790788a9195c7a810c2

Plaintext (hexencoded):

51235741798171edfc243dd3c06b5933 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

Q#WAy\x81q\xed\xfc$=\xd3\xc0kY3 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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