How to force iOS to ask for S/MIME private key password every time?

Hi, I am using S/MIME signing and encryption on my iOS devices and I am very surprised that the system does not require password for encrypting, decrypting or signing a message when using my cell phone. Everyone with access to it (be it a thief who saw my unlock code or somebody I know personally) will be able to send/read all encrypted messages. That is a deal breaker for me and I hope I am not the only one.
So the question is: I need to be asked for a password everytime I (a) read encrypted message, (b) send a signed message or (c) send an encrypted message.
How can I do that?
I imported my key via iPhone configuration utility, but I was unable to find an option for that.

By revealing your unlock code your device is already compromised. Just like revealing your computers login password. Once the computer is compromised, any number of things can be done which render the certificate password useless. Keyloggers can be installed, the kernel can be patched to steal DPAPI keys, etc. Real software companies like Apple and Microsoft don't entertain security through obscurity.

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