Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

4ba2ce5213e2b959ad0c4921612900d3fa439fa342cb0dc282fb48d0bdb0056dd4f4833fc06637d38d614ed03181641df2d4ba844192960ac0edffb4d56c73b0

Ciphertext (hexencoded):

4ba2ce5213e2b959ad0c4921612900d3 fa439fa342cb0dc282fb48d0bdb0056d d4f4833fc06637d38d614ed03181641d f2d4ba844192960ac0edffb4d56c73b0

Plaintext (hexencoded):

4ba2ce5213e2b959ad0c4921612900d3 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

K\xa2\xceR\x13\xe2\xb9Y\xad\x0cI!a)\x00\xd3 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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