如何将Base64编码的Binary plist转换为可读格式？

我一直在尝试解决一个问题，需要将Base64编码的Binary plist文件转为可读格式，以下是该文件的部分代码片段：

<key>classKeyIdx</key>
<integer>11</integer>
<key>data</key>
<dict>
    <key>ciphertext</key>
    <data>
        YnBsaXN0MDDUAQIDBAUGBwpYJHZlcnNpb25ZJGFyY2hpdmVyVCR0
        b3BYJG9iamVjdHMSAAGGoF8QD05TS2V5ZWRBcmNoaXZlctEICVRy
        b290gAGmCwwVFhcYVSRudWxs1A0ODxAREhMUViRjbGFzc18QFlNG
        SW5pdGlhbGl6YXRpb25WZWN0b3JcU0ZDaXBoZXJ0ZXh0XxAUU0ZB
        dXRoZW50aWNhdGlvbkNvZGWABYAEgAKAA08RAUBAvCvsM96NqKlU
        9ia5p3bzbxtssls26FA6Vf5LQryDagfVaoSyDdDuHGdMQmMtKwls
        +AoVjEqhmnT9G7km7c5fScPBHysrCazJCT71Z/5TZBwYMhjcVS3U
        weH7/u588wYigSjWf2odJnvY+fv5M19OJP9ldgz43W19yyXJrmqt
        uzMWbDnj1OXpEa1AdC7D3ld30mt5tO2Ie9uQGs9ggwJMbvomVTnX
        Q2bLI5NT7esS/0w3AqCm3h0pDEjZ8uOcb37DDm4eB8ppZhyi7YBR
        hnlii/10mYYnqbxgXsGpwVOOEbhwJboYcOxGQYEBNgHXSFLgGF6f
        BID53iPU/Iic1AuJNyepkLke3+ohp8MxxB8583ws422FcU7OMZia
        kQWsvi2keGZ3qFbh5TA9nNqfRIoZ0xk36X6wcnrmODLy+4mRCk8Q
        EDbi8aFoWsYO6vlAUAU/j1VPECBn5T3qX+uYursdxPEZFW5wbtOg
        s2InhowRPlIA3Z4FCdIZGhscWiRjbGFzc25hbWVYJGNsYXNzZXNf
        EBpfU0ZBdXRoZW50aWNhdGVkQ2lwaGVydGV4dKMdHh9fEBpfU0ZB
        dXRoZW50aWNhdGVkQ2lwaGVydGV4dF1fU0ZDaXBoZXJ0ZXh0WE5T
        T2JqZWN0AAgAEQAaACQAKQAyADcASQBMAFEAUwBaAGAAaQBwAIkA
        lgCtAK8AsQCzALUB+QIMAi8CNAI/AkgCZQJpAoYClAAAAAAAAAIB
        AAAAAAAAACAAAAAAAAAAAAAAAAAAAAKd
    </data>
    <key>tamperCheck</key>
    <string>38FBD9A8-6BFE-41A3-A228-EACBA03663E1</string>
    <key>unwrappedKey</key>
    <data>
        gvpDnO1bm662KrtkzGa4xoL9jqWIm1kJBWYlnAQKZuU=
    </data>
</dict>

我想要提取图中标记区域的数据，这是学校项目的测试手机数据，已经试过Mac的plutil工具和在线Base64转换，但转换后的内容毫无意义。

内容的提问来源于stack exchange，提问作者Twix