Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9563e1ad5427a93758eb73b21b1529fc3548a3cde8e7abb5b9fa470c9696210ee7537772c77a4e8b399b679184d5422db78391e1f1df3a380c69c2fb6653ddd0

Ciphertext (hexencoded):

9563e1ad5427a93758eb73b21b1529fc 3548a3cde8e7abb5b9fa470c9696210e e7537772c77a4e8b399b679184d5422d b78391e1f1df3a380c69c2fb6653ddd0

Plaintext (hexencoded):

9563e1ad5427a93758eb73b21b1529fc 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x95c\xe1\xadT\'\xa97X\xebs\xb2\x1b\x15)\xfc {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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