Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

5a5e233a62147cf87665b9678dbf8b45d45f1f627ffb740b7cdf2df016321dabd00487a16f93005a196c9f650b6820611aaecd8de2797d4782fb618737b55a78

Ciphertext (hexencoded):

5a5e233a62147cf87665b9678dbf8b45 d45f1f627ffb740b7cdf2df016321dab d00487a16f93005a196c9f650b682061 1aaecd8de2797d4782fb618737b55a78

Plaintext (hexencoded):

5a5e233a62147cf87665b9678dbf8b45 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

Z^#:b\x14|\xf8ve\xb9g\x8d\xbf\x8bE {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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