Usage of SecureString in WPF

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SecureString is not deprecated in .NET Framework 4.8 and can still be used to store the PIN temporarily in memory for a WPF app. However, Microsoft no longer recommends it for new development or for future frameworks.

 
The protection provided by SecureString is limited.

For stronger security or cross-platform scenarios, use Windows DPAPI or Credential Manger instead.

How to: Use Data Protection - .NET | Microsoft Learn

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The SecureString class in C# is part of the System.Security namespace and is designed to handle sensitive text data, such as passwords, more securely than regular strings. It achieves this by encrypting the data in memory and allowing controlled access to it. Unlike regular strings, SecureString is mutable, enabling modifications without creating multiple copies in memory, and it can be explicitly disposed of to remove sensitive data immediately.

Limitations and Considerations

• Limited Security Scope: SecureString reduces the time sensitive data is in plain text but does not eliminate all risks. For example, the data must be decrypted when used, exposing it temporarily.
• Platform Dependency: On non-Windows platforms, SecureString may not encrypt its data due to missing APIs.
• Microsoft Recommendation: Microsoft no longer recommends SecureString for new development, suggesting alternative approaches like certificates or Windows authentication.