Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1b1fcbcf58adbb3ec2ad022ce468c4e50cfb7e2f2adf4c74f6b5f7270fa1fa5cc2c2bdb0d4679539b9e1e1207fada7afd04fdde9fd6aeebca59d5b8a40ae4983

Ciphertext (hexencoded):

1b1fcbcf58adbb3ec2ad022ce468c4e5 0cfb7e2f2adf4c74f6b5f7270fa1fa5c c2c2bdb0d4679539b9e1e1207fada7af d04fdde9fd6aeebca59d5b8a40ae4983

Plaintext (hexencoded):

1b1fcbcf58adbb3ec2ad022ce468c4e5 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1b\x1f\xcb\xcfX\xad\xbb>\xc2\xad\x02,\xe4h\xc4\xe5 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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