Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ba53d734b1ae0f93cf8cc0ca34cf92808467475ff42bb5e4ece6073f7c8851b64b3f7b34c0cbbeb5d79a6a24c460de4f5d98acc8ebda5be0791c61e85e9b823d

Ciphertext (hexencoded):

ba53d734b1ae0f93cf8cc0ca34cf9280 8467475ff42bb5e4ece6073f7c8851b6 4b3f7b34c0cbbeb5d79a6a24c460de4f 5d98acc8ebda5be0791c61e85e9b823d

Plaintext (hexencoded):

ba53d734b1ae0f93cf8cc0ca34cf9280 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbaS\xd74\xb1\xae\x0f\x93\xcf\x8c\xc0\xca4\xcf\x92\x80 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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