We have seen an increase in sites using these systems, particularily where many users login to machines remotely. The difficulty is setting up a system which is secure and reliable as well as not inconveniencing the users. Encryption of disk files. Disk files should be kept encrypted when the data is particularly important. Passwords, social security numbers and credit card numbers should always be encrypted.
Many accounting systems use encryption.
Even at that it is advisable only to do so with reputable companies that you are familiar with. You should never need a credit card number to get something that is free. Encrypted email software should be used when someone would have a reason to want to see, forge or alter email messages. Random manual monitoring. For a few businesses that deal with very sensitive information and must use networks, the security administrators will occasionally manually look at the information being passed over the network, particularly through the firewall.