Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

843067cea0c14982389894abc9866d6751af9955e95706438978de77071b58e97bb1835da8fc406b03a5d455901adac483d8d2f7700377cf185a9a50a67e13c1

Ciphertext (hexencoded):

843067cea0c14982389894abc9866d67 51af9955e95706438978de77071b58e9 7bb1835da8fc406b03a5d455901adac4 83d8d2f7700377cf185a9a50a67e13c1

Plaintext (hexencoded):

843067cea0c14982389894abc9866d67 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x840g\xce\xa0\xc1I\x828\x98\x94\xab\xc9\x86mg {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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