About the certificate:

Meaning: The mobile phone certificate can be understood as: a pass for the software

English name: Phone certificate

S60 Third The version has made relatively big improvements in terms of security, and has stricter regulations on third-party software installed and run in the system. Certain software operations involving mobile phone software and hardware security/personal information security and other aspects are subject to special restrictions (for example, automatic startup when the phone is turned on is one of the restricted functions).

Some software will have functional restrictions after installation, such as: Caller

The function

is mainly to prevent malware. Applications must obtain a "signature" to implement these "specially restricted" functions. In other words, someone must be responsible for the safety of this operation! Programs without any signature cannot be installed and run.

Where to put the obtained "certificate"?

The certificate is not for installation, nor is it simply placed in a folder. The certificate is used to sign software that needs to be "signed". The certificate is not used directly. The certificate needs to be packaged into the sis software through a special program. The purpose of the certificate is only to grant certain permissions to the program. Don’t lose the certificate you got!

What is a signature?

The so-called "signing" is a process of packaging the certificate into the program that needs to be signed. This operation process requires special signing tools (software).

What is self-signed program software?

As the name suggests, self-signing means that you need to sign it yourself. This self-signed program software can only be used on the mobile phone with the serial number, and cannot be used on other mobile phones. (Currently, the forum produces 1,000 serial numbers from the same batch using one certificate)

Certificate expiration:

The certificate mentioned here has expired, not the mobile phone prompt when installing the program. The certificate has expired, but the CER certificate file you applied for has expired. In fact, it does not matter if it expires. The expired certificate can also successfully sign the program. It is just that when installing the signed program, you need to adjust the time to the CER certificate file. It can be installed within the validity period.

Usually the mobile software we download will have signed and unsigned versions. For unsigned software, we can apply for a certificate ourselves and produce software for our own machine through the SIGN tool provided by Symbian. Make a KEY file for your phone and write it into the software you want to install. Then the software can only be installed on your phone.

In short, the certificate mechanism is a measure used to deal with security issues. Its main functions are two points: 1. Prove the legitimacy of the software. 2. Allow the software to start automatically.