ccna before ceh

ccna before ceh.RSA is approximately 100 times slower than DES in hardware and approximately 1000 times slower than DES in software. This performance issue is the main reason why RSA is typically used to protect only small amounts of data. RSA is primarily used to ensure the confidentiality of data through encryption and to authenticate data or (and) provide non-repudiation of data through the generation of digital signatures.744 Public Key Infrastructure7.4.4.1 Overview of Public Key InfrastructureIn large organizations, it is impractical to require all parties to exchange identification documents on an ongoing basis. Using a trusted third-party protocol, all individuals agree to accept messages from a neutral third party. It is assumed that the third party conducts an in-depth investigation prior to issuing a certificate, and after the in-depth investigation, the third party issues a certificate that is difficult to forge. After this, all individuals who trust the third party simply accept the certificate issued by the third party. A certificate server is an example of a trusted third party.As an example, a large Cisco-like organization issues ID cards after reasonable efforts have been made to identify employees and contracted parties Hii. Such cards are relatively difficult to forge, and measures are taken to protect the integrity of the I: and the card . s issuance are protected. As a result of these measures, all Cisco personnel accept the I: as credible proof of any individual's membership.Without this method, 90 verifications would be required when there are 10 individuals that need to be validated against each other. Adding a new individual to the group would add another 20 verifications, since the initial 10 individuals would all need to authenticate the new individual, and the new individual would need to authenticate the initial 10 individuals. This approach does not scale well.As a further example, suppose that Alice requests a driver's license in Alice. In this process, she submits proof of her identity and driving eligibility. Her application is approved and she is granted a . license. Afterwards, Alice;/...} has to cash a check at the bank. After handing the check to the bank teller, the bank teller asked her to identify herself. By ". The bank trusts the government agency that issued the driver's license, so the bank verifies her identity and cashes her check.The certificate server functions similarly to the agency that issues driver's licenses. The hook driving license functions similarly to the one in . A public key infrastructure (PKI) or other technology supporting certificates plants a certificate. How does a PKI actually work?7.4.4.2 The PKI FrameworkA PKI is a framework for the services needed to support large-scale public-key-based technologies. PKI considers solutions that are very scalable and are becoming an extremely important VPN authentication solution.