DNS Flush in OS X Tiger and Leopard
Posted by Mr. IT Guy | Filed under Howto, IT in General, Mac OSX, Operating System
OS X Tiger uses
lookupd -flushcacheto flush DNS entries.
OS X Leopard uses
dscacheutil -flushcacheto flush DNS entries.
How Email and Digital Signing Works
Posted by Mr. IT Guy | Filed under IT in General
Digital signing is used to confirm authenticity of the e-mail sender and encryption is used to secure the communication to prevent others from seeing the content.
For example, John and Jane works on a top secret project and wants to make sure that their e-mail correspondence is secure. Each of them has a personal certificate and send a digitally signed non-sensitive e-mail to each other. When John receives Jane’s email, his computer check the authenticity of Jane’s certificate through the Certificate Authority (CA). Read the rest of this entry »
Tags: digital signature, email, encryption, security