I don't know what rad-hardened storage is out there that can be used, but if security is critical, there is always the good old fashioned one time pad.
OTPs could be consumed directly for maximum security commands, or used as a way to encrypt a Diffie-Hellman session key generation for stuff that needs less security. The session key can be used without drawing down the random number pool.
Of course the ultimate downside of OTPs are that when the number pool is exhausted, you are fscked, so trying to use the pool as little as possible is important.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/Eis6SMZLxiY/story01.htm
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