Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1051451326cba723e5cb1233d243c8a91dc51364ceb6742adf4d039b22276e3451ec6f5f4539cafa9c51014c97505d6a556c61d4c4010ab8bfc3d9514fcde691

Ciphertext (hexencoded):

1051451326cba723e5cb1233d243c8a9 1dc51364ceb6742adf4d039b22276e34 51ec6f5f4539cafa9c51014c97505d6a 556c61d4c4010ab8bfc3d9514fcde691

Plaintext (hexencoded):

1051451326cba723e5cb1233d243c8a9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x10QE\x13&\xcb\xa7#\xe5\xcb\x123\xd2C\xc8\xa9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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