Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1c0e0197e79d950164263a0dab8df00b6d625ec6ae7014af9c871b8c0e20799f00813c017d40915d2130c675956315a6f307c98ff1e696f377fe2894a741e80d

Ciphertext (hexencoded):

1c0e0197e79d950164263a0dab8df00b 6d625ec6ae7014af9c871b8c0e20799f 00813c017d40915d2130c675956315a6 f307c98ff1e696f377fe2894a741e80d

Plaintext (hexencoded):

1c0e0197e79d950164263a0dab8df00b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1c\x0e\x01\x97\xe7\x9d\x95\x01d&:\r\xab\x8d\xf0\x0b {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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