Let me explain something to you. Ha, watch (* _ _ *) hee hee. ...
But not all downloaded software requires a certificate, some free software is not needed, and some can be used by trying to adjust the time of your mobile phone forward. The specific situation still needs to be analyzed in detail, not all cases are like this.
Mobile phone certificate can be understood as: a pass for software.
English name: telephone certificate
The third edition of Symbian S60 has greatly improved the security, and has stricter regulations on the third-party software installed and running in the system. Special restrictions are imposed on the operation of some software related to mobile phone hardware and software/personal information security (for example, automatic startup of mobile phone startup is one of the restricted functions).
Some software will have functional restrictions after installation, such as incoming calls.
Mainly to prevent malicious software. In order to realize these "specially restricted" functions, the application must obtain a "signature". In other words, someone should be responsible for the safety of this operation! A program without any signature cannot be installed and run.
Where should I put the obtained "certificate"?
In fact, certificates are not simply placed in any folder. Certificates are used to sign software that needs to be "signed". Certificates are not used directly, but packaged into sis software through a special program. The role of a certificate is only to give the program certain permissions. Don't lose the certificate you got, because a certificate is valid for 6 months and can be used to sign many softwares. If the certificate expires, you can apply for a new certificate, or you can adjust the time of the mobile phone before installation. Just adjust the time to the validity period of the certificate.
Usually downloaded mobile phone software has a signed version and an unsigned version. For unsigned software, we can apply for a certificate to make software for our machine, make the key file of our mobile phone through the sign tool provided by Saipan, and then write the software to be installed, and then the software can only be installed in your mobile phone.
In short, the certificate mechanism is a measure to solve security problems, and its functions are mainly two points: 1. Prove the legitimacy of the software. 2。 Give the software a higher right to use.
20 certification body functions:
(1) Network service: used to use the mobile network.
(2)LocalServices: used to send or receive messages through U*, infrared and Bluetooth.
(3)ReadUserData: allows reading user data.
(4)WriteUserData: User data is allowed to be written.
(5) Location: Access to the location information of the mobile phone is allowed.
(6) User environment: access to real-time confidential information of users and their surroundings is allowed.
(7)PowerMgmt: It is allowed to interrupt any process or change the machine state in the system.
(8)SwEvent: It is allowed to generate or capture keyboard and pen input events.
(9)ReadDeviceData: allows reading system device driver data.
(10)WriteDeviceData: allows writing system device driver data.
(1 1) Surround Add: Allows access to logical device drivers that provide input information for peripheral devices.
(12)TustedUI: UI used to distinguish "normal" applications from "trusted" applications.
(13)ProtServ: Allow server applications to register with protected names.
(14) Network control: the right to modify or access network protocol control.
(15)multimedia add: Allow access to all multimedia device drivers.
(16)CommDD: Allow access to communication device drivers.
(17)DiskAdmin: allows hard disk management operations, such as formatting drives.
(18)DRM: Allows access to DRM-protected content.
(19)TCB: Allow access to /*s and /resource directories in the terminal.
(20)AllFiles: All files in the system are allowed to be visible, and files under /private can be written.
"Personal Development Certificate" is a certificate with the previous 13 function. PublisherID Certificate is a certificate with the previous 17 functions. In the past, all the certificates given by Saipan for free were 13 permissions, but now all the major forums and Taobao merchants have issued 17 permissions, and now the A4 version of the first five internal tests is 19 permissions (all permissions except TCB)! The reason is that all programs need input method, so the input method DLL needs all programs to load. The root certificate has 20 permissions.
Is that clear? Hehe ~ ~ The operation of the certificate is not done on the mobile phone, but on the computer. Frankly speaking, installing illegal software in a genuine mobile phone requires a certificate signature to crack it and turn it into a legal one, and it can only be used after being installed in the mobile phone. It seems that this metaphor is not very vivid and appropriate, just have a look! Should be able to understand? Haha ~