How to verify signature of public key?

As per http://en.wikipedia.org/wiki/X.509

To validate this certificate, one needs a second certificate that matches the Issuer (Thawte Server CA) of the first certificate. First, one verifies that the second certificate is of a CA kind; that is, that it can be used to issue other certificates. This is done by inspecting a value of the CA attribute in the X509v3 extension section. [b]Then the RSA public key from the CA certificate is used to decode the signature on the first certificate to obtain a MD5 hash, which must match an actual MD5 hash computed over the rest of the certificate. [/b]

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Could someone please provide one practical example to learn how it works? Thanks!
beer9Asked:
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Dave_DietzCommented:
What exactly do you mean by a 'practical example'?  

Signature verification happens every time you open an HTTPS URL in a browser, but I don't believe this is the kind of practical example you mean.

Dave Dietz
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beer9Author Commented:
Thank you! :-)
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