Most app developers will integrate some third party libraries into their apps. If it's to access a service, such as Dropbox or YouTube, or for logging crashes. The number of third party libraries and services is staggering. Most of those libraries and services are integrated by somehow authenticating with the service, most of the time, this happens through an API key. For security purposes, services usually generate a public and private, often also referred to as secret, key. Unfortunately, in order to connect to the services, this private key must be used to authenticate and hence, probably be part of the application.
Needless to say, that this faces in immense security problem. Public and private API keys can be extracted from APKs in a matter of minutes and can easily be automated.
假设我有类似的东西，我如何保护密钥:
public class DropboxService {
private final static String APP_KEY = "jk433g34hg3";
private final static String APP_SECRET = "987dwdqwdqw90";
private final static AccessType ACCESS_TYPE = AccessType.DROPBOX;
// SOME MORE CODE HERE
}
你认为储存私钥的最佳及最安全的方法是什么?混淆，加密，你怎么看?
一个可能的解决方案是在应用程序中编码数据，并在运行时(当你想使用该数据时)使用解码。我还建议使用progaard来增加应用程序反编译源代码的阅读和理解难度。例如，我把一个编码的密钥在应用程序，然后使用解码方法在我的应用程序解码我的秘密密钥在运行时:
// "the real string is: "mypassword" ";
//encoded 2 times with an algorithm or you can encode with other algorithms too
public String getClientSecret() {
return Utils.decode(Utils
.decode("Ylhsd1lYTnpkMjl5WkE9PQ=="));
}
一个受保护的应用程序的反编译源代码如下:
public String c()
{
return com.myrpoject.mypackage.g.h.a(com.myrpoject.mypackage.g.h.a("Ylhsd1lYTnpkMjl5WkE9PQ=="));
}
至少对我来说够复杂了。当我别无选择只能在我的应用程序中存储一个值时，我就是这样做的。当然我们都知道这不是最好的方法，但对我来说很管用。
/**
* @param input
* @return decoded string
*/
public static String decode(String input) {
// Receiving side
String text = "";
try {
byte[] data = Decoder.decode(input);
text = new String(data, "UTF-8");
return text;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return "Error";
}
反编译版本:
public static String a(String paramString)
{
try
{
str = new String(a.a(paramString), "UTF-8");
return str;
}
catch (UnsupportedEncodingException localUnsupportedEncodingException)
{
while (true)
{
localUnsupportedEncodingException.printStackTrace();
String str = "Error";
}
}
}
你可以在谷歌中找到这么多的加密类。
