Certificates can also be used to authenticate a person who is seeking to access sensitive information while at a remote location. By encrypting digitally, the contents of an attachment or message cannot be altered or tampered with while they are being delivered. Server digital certificates can cost anywhere from $100 to more than $1,000, depending on the features you want. Many companies use these types of certificates to establish that the person signing into company server is an authentic user of the company resources. Server certificates are usually used to encrypt secure on-line transactions, such as purchases made with credit cards. There are various types of digital certificates, with the most widely used ones being server certificates and client certificates. It is similar to a driver’s license, because it is issued by a reputable third party, termed a certificate authority. For example, there is a button within Microsoft Outlook that allows you to digitally sign e-mails, and another button that allows you to digitally encrypt them. Digital encryption can be compared to the centuries-old practice of sealing letters with a wax seal on the envelope.
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