Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3f5028475caf3a700904bbe305f33b1c6882f912eda5cbdd5c2216592626d6b1cb5bce413f8497ae9e37fe48e7c294841221e0dc347dc75ff5844620195482e9

Ciphertext (hexencoded):

3f5028475caf3a700904bbe305f33b1c 6882f912eda5cbdd5c2216592626d6b1 cb5bce413f8497ae9e37fe48e7c29484 1221e0dc347dc75ff5844620195482e9

Plaintext (hexencoded):

3f5028475caf3a700904bbe305f33b1c 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

?P(G\\\xaf:p\t\x04\xbb\xe3\x05\xf3;\x1c {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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