Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

41eeafecf9edd36def9c727c6f253981ffcbc74a7fa46b1f8f2c3f8cafbd5b1565f11aa3a69b5b252f354ea98329dacfb0eb053e69b6e7e6563191d82996420e

Ciphertext (hexencoded):

41eeafecf9edd36def9c727c6f253981 ffcbc74a7fa46b1f8f2c3f8cafbd5b15 65f11aa3a69b5b252f354ea98329dacf b0eb053e69b6e7e6563191d82996420e

Plaintext (hexencoded):

41eeafecf9edd36def9c727c6f253981 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

A\xee\xaf\xec\xf9\xed\xd3m\xef\x9cr|o%9\x81 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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