How operative systems use cryptography

[haZard0us <hazard0us.pt () gmail com>]

Hello all,

This may like a silly question - no problem, I'm kind of silly in this area - but I want to know where and how 
operative systems use it.

I've searched on google but all I found is about password hashing. And because probably it's used somewhere else, I'm 
here asking the help for the OSes gurus :)

Cheers!

--haZ
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Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
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highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

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