Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

4064d4666c17a8bda1d7d024d3399cdd90bd2dbb753cb7786b9bff27b5b36df3c733eb1a80dcf3523e9fa72bce00b6950a9cd4925a2448dc87fc69d6e799ff08

Ciphertext (hexencoded):

4064d4666c17a8bda1d7d024d3399cdd 90bd2dbb753cb7786b9bff27b5b36df3 c733eb1a80dcf3523e9fa72bce00b695 0a9cd4925a2448dc87fc69d6e799ff08

Plaintext (hexencoded):

4064d4666c17a8bda1d7d024d3399cdd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

@d\xd4fl\x17\xa8\xbd\xa1\xd7\xd0$\xd39\x9c\xdd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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