Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

321e87d7bd785469d4d1aee3b16dcc67460525404a6226b89ebd0b69d79e3f2f7fac2ce6fd12a7c9d3c455e935e910b30ba35d1af16dd0c44a50e74a3cc2979d

Ciphertext (hexencoded):

321e87d7bd785469d4d1aee3b16dcc67 460525404a6226b89ebd0b69d79e3f2f 7fac2ce6fd12a7c9d3c455e935e910b3 0ba35d1af16dd0c44a50e74a3cc2979d

Plaintext (hexencoded):

321e87d7bd785469d4d1aee3b16dcc67 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

2\x1e\x87\xd7\xbdxTi\xd4\xd1\xae\xe3\xb1m\xccg {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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