Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

86014dd1d4f2c913e671911d4889c4bb5eedee90ce76602eebd1285db24cc9c2f835a624eb410ca617f95b930ae7bdc76befa5533c0d63d8cd6011141faca315

Ciphertext (hexencoded):

86014dd1d4f2c913e671911d4889c4bb 5eedee90ce76602eebd1285db24cc9c2 f835a624eb410ca617f95b930ae7bdc7 6befa5533c0d63d8cd6011141faca315

Plaintext (hexencoded):

86014dd1d4f2c913e671911d4889c4bb 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x86\x01M\xd1\xd4\xf2\xc9\x13\xe6q\x91\x1dH\x89\xc4\xbb {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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