What is the use of a mobile phone certificate for a smartphone?

The certificate is the installation license, with which you can sign the software you want to install, and the signed software can be installed on your phone. The third version of S60 has made significant security improvements, with stricter regulations on third-party software installed and running in the system. Some operations involving the software and hardware security of mobile phones, personal information security, etc., have been specially restricted (for example, automatic start with the boot of the mobile phone is one of the restricted functions).

The application wants to implement these"It is specially restricted"must be "signed". In other words, someone has to be responsible for the safety of this operation! Programs that are not signed cannot be installed and run.

The virus attacks because it can secretly mount your system without authorization, and automatically run, invoke, modify system files, and run automatically every time you boot up, and then replicate itself exponentially and transfer it between different computers, and you can't get rid of it. And none of this is possible under S60 version 3, because this is the certificate verification mechanism that you love and hate.

Even if the virus maker uses the lowest-grade certificate, you can install it, but because he doesn't have permissions, he can't start autonomously, can't call system files and programs, and can't spread to other phones, so it's a waste. And to get high permissions, unless this software lets you sign him, you have to pass your own level first, if you really sign a virus, then the harm of the virus is also minimal, because the certificate is unique to your phone, and it cannot be installed on someone else's phone.

As required for installing certain software. My is 6120, for example, install a mobile phone theme, it is made and uploaded, you install it now, and it will prompt the certificate to expire. If you set the time to 2006, it will indicate that the certificate has not taken effect.

For the sake of software security, it is not easy to be poisoned.

The above answers are collected and provided by Dynamic Qing, I hope that others will not copy, respect the fruits of others' labor, thank you.

A smartphone's security certificate is the phone's ID card when conducting online transactions.

A security certificate is a unique tool used to confirm the identity of a secure e-commerce transaction. A cardholder security certificate is an electronic representation of a payment card. Because it is digitally signed by the certificate management authority, no third party can modify the contents of the certificate.

Any credit card holder can only participate in secure e-commerce online transactions if they apply for the corresponding digital certificate. A merchant digital certificate is used to prove the identity of a merchant and its relationship with the beneficiary bank, indicating that the merchant can receive payments from payment cards.

Since the merchant certificate is digitally signed by the certificate management center, no third party can modify the content of the certificate. Any online store can only participate in online transactions of secure e-commerce, sell its own goods or provide services if it has applied for a merchant digital certificate. According to the SET standard, the digital certificate is confirmed step by step through a trust cascade relationship.

Each certificate is connected to the higher-level CA that signed the certificate, thus forming a tree-like chain of trust. A cardholder certificate is linked to the issuer certificate (CCA), which in turn is connected to the root CA through the brand CA. A merchant certificate is connected to the merchant CA (MCA), which in turn is connected to the root CA through the brand CA.

The security certificate is encrypted by the top international certification authority (CA for short), and the key length varies from 40 bits to 256 bits, which is called encryption strength, and the larger the key length, the more difficult it is to crack and the more secure it is.