Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

3dac82541e7d4079b6dd687e35dce9f3b927f3d075337d28e348220c06b099c0b5ccf3d4a75ad1618d553c69b02ccd2b2d386c596eb4842a5f735000799c9e67

Ciphertext (hexencoded):

3dac82541e7d4079b6dd687e35dce9f3 b927f3d075337d28e348220c06b099c0 b5ccf3d4a75ad1618d553c69b02ccd2b 2d386c596eb4842a5f735000799c9e67

Plaintext (hexencoded):

3dac82541e7d4079b6dd687e35dce9f3 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

=\xac\x82T\x1e}@y\xb6\xddh~5\xdc\xe9\xf3 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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