A trusted third party issues a digital certificate to prove the credibility of an authority (California). California confirms and proves that the holder and the "marked" identity certificate confirm that it has not been forged or modified under any circumstances.
Digital authentication now has a new use.
Digital authentication is now used to provide security and authentication for wireless connections, and hardware manufacturers are the first to use them. Not long ago, VeriSign Inc announced its cable modem authentication service, allowing hardware manufacturers to set digital authentication for cable modems to help them prevent broadband services from being pirated through devices.
Using VeriSign software, hardware manufacturers may let manufacturers or cable TV facilities providers use cryptographic keys and corresponding digital authentication to automatically identify their respective modems.
Allowing this "last mile" authentication not only ensures the value of existing content and services, but also enables cable TV system operators to bring a wider range of new services, applications and value-added services to the market.
When a digital certificate is signed by a CA, its owner can use it as an electronic passport to prove his identity. It can be required to securely access websites, networks or individuals.
The information set in the certificate includes the holder's name and e-mail, the name of the CA, a number and all the activated or invalid data as the certificate. When CA verifies the identity of the user, the user's public key data is proved and protected.
The public key is verified by the network server for the authenticity of the website and the use of the user's browser. When a user wants to send confidential information (such as the credit card number of online transaction) to the network server, the digital authentication of the browser in the server will access the public key to verify his identity.
Sentences are not very fluent, and I haven't been exposed to English for a long time. Please modify it yourself. Sorry, my level is limited!