7.5 Summary
Many people think that computer security begins and ends with
encryption. After all, how can data be secure if it is not encrypted?
In fact, cryptography has a lot to do with
security—it's one of the most powerful tools
for keeping data secure. That's why we have spent so
much time on cryptography in this chapter! But
there's cryptography and then
there's cryptography—as you have seen,
cryptography encompasses a range of techniques, algorithms, purposes,
and objectives. In this chapter we've tried to
present an overview that is good enough for you to understand the
basics of encryption as they apply to securing a Unix server.
Now you know enough to be dangerous! Although you should have no
problem using an encryption package like OpenSSL or
Apache's mod_ssl, before you
start designing your own encryption systems, you should read several
books that are devoted entirely to the subject.
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