Introduction - If you have any usage issues, please Google them yourself
Information security is the concept existed since ancient times, such as the previous pass in order to ensure the confidentiality of correspondence, the use of wax to seal letters or otherwise encapsulated in an envelope also use the password confirmation signal the identity of the person receiving the information, etc. methods. Note that, information security technology is the carrier with the form and send the information closely related to the media, information carriers and information transmission medium changes will inevitably lead to changes in information security technology change and development.