title: .Net 3.5, most secure way to pass string between processes
body: <p>I'd like to be able to pass a SecureString (a cached passphrase) to a child process in C# (.Net 3.5), but I don't know what the most secure way is to do it. If I were to convert the SecureString back to a regular string and pass it as a command-line argument, for example, then I <em>think</em> the value may be prone to disk paging--which would make the plaintext touch the filesystem and ruin the point of using SecureString.</p>
  
  <p>Can the IntPtr for the SecureString be passed instead? Could I use a named pipe without increasing the risk?</p>