Which Java data type would you choose for storing sensitive information, like passwords, and Why?

By | August 12, 2019

In this blog post we will talk about Which Java data type would you choose for storing sensitive information, like passwords, and Why? Below are the main reason to choose char datatype to store sensitive information, like password.

  • There is no way to clear a String Object from the memory, it’s up to GC to collect it.
  • String objects are immutable and stored in a String Pool (may reside inside a PermGen space) which may not at all be GC’d.
  • Any person taking the heap dump can easily see the String
  • In case of a char array, we can always nullify it once we are done with the information, so not much dependency on the GC, thus we are narrowing the time window for the life of sensitive data.

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