Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

5010d040a0c568acef868930cebe0d89c03e74654c42fdf74a885f1f267a1ccaf837c8f5694c4b17b361001d7acd86cff7db1da103048206b1b58c302a928fe8

Ciphertext (hexencoded):

5010d040a0c568acef868930cebe0d89 c03e74654c42fdf74a885f1f267a1cca f837c8f5694c4b17b361001d7acd86cf f7db1da103048206b1b58c302a928fe8

Plaintext (hexencoded):

5010d040a0c568acef868930cebe0d89 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

P\x10\xd0@\xa0\xc5h\xac\xef\x86\x890\xce\xbe\r\x89 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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