Fractionate your information stream
Everybody will tell you that itís good practice to change your password periodically. Itís definitely true. Any computer user must do it. Here Iíll say a thing that must be done by paranoiac.
Take a stream of information that you create over year. Take note that the stream isnít continuous but partitioned like a stream of email messages sent over time. If you encrypt the stream with a public-key encryption algorithm; youíll be able to aggregate many message from different sources. The thing is that if you donít change you public/private keys, anybody who discovers your private key will be able to access your entire stream over time if he logged it. This is a real problem if such a thing append. Itís why the concept of information partitioning is important. You only need to change you keys each n day and if your attacker find your current private key heíll not have access to the whole stream of information. Itís a way to add security within the security provided by the cryptosystem.
As I said, itís for paranoiac only. Itís just a little thought that come up in my mind today, enjoy it.
8:50:56 PM