Which is the official signature of Symbian mobile phone operating system. Software that has passed Symbian security certification will get Symbian.

Sign. This software has the highest security level. Can be installed/run normally on the mobile phone/and can realize all the functions provided by the software.

Obtaining Symbian signature requires the software author to deal directly with Symbian officials. For various reasons,

Not all software authors have the ability to obtain this certification.

2. Signature of the author.

The author of the software signed his name when he released the software. This kind of software can be installed and run on the mobile phone (it may encounter security problems).

Sex warning, can be skipped). But those "specially restricted" functions cannot be realized. If a software doesn't involve this function at all, it is entirely possible for the software author to sign it himself. Another possibility is that although some functions of the software are within the scope of "special restrictions", they are not the main functions. The software author may also release an "author's signature version", which can normally use most functions, but will lose some specific functions. For example, there is such a version of the "incoming call" software that almost all functions can be used, but it can't be started automatically.

3. User signature.

Strictly speaking, this should belong to the "developer signature". Because Symbian provides a kind of "development certificate" for software developers, the original intention is to let software developers do software testing. This "development certificate" is associated with the IMEI code of the machine used for testing. The software signed with this certificate can only be used on the machine corresponding to the IMEI code, not on other machines.

Our so-called "self-signature" is actually in this way. To put it bluntly, you said you were developing software, you provided the IMEI code of your tester, and Symbian issued you a "development certificate". You use this certificate to sign your Test Software. You are responsible for your "development behavior"! That's all. In addition, the development certificate is valid for half a year from the date of issuance. However, within the validity period of the certificate, there is no limit on the use time of the signed program.

In a few words, the formal steps for handling the "development certificate" are as follows: (Please refer to the relevant tutorials for specific operations, and only briefly describe the steps here)

1. Go to Symbian official website to register a user.

2. Download an authentication request tool: DevCertRequest.

3. Install and run DevCertRequest tool on PC, fill in the IMEI code of your machine, and generate a. csr file, which is true.

In the world, it is an identification file formed by your IMEI code through a specific algorithm.

4. Log in to Symbian official website again and submit (upload). Csr file, Symbian will generate a development certificate according to the identification file.

5. Download the obtained development certificate and use the signing tool to write the development signature into the application.

Someone asked Symbian official website why not let users directly enter your IMEI code on the website and download the development certificate directly? It is troublesome to download a tool to form an identification file locally and then upload it. What is the reason? Is to protect user privacy.

Imei = international mobile equipment identity = international mobile equipment identity card. This is similar to your "resident ID card". This thing belongs to the privacy scope. Symbian will not directly input this information on the website to protect users' privacy.

Yes. The csr file formed by DevCertRequest is encrypted with IMEI information, but the user's IMEI code cannot be calculated by any means.

It is beyond the scope of this post to discuss whether it is appropriate to publish IMEI code on the forum at will, and what will happen if IMEI is leaked. However, users should be reminded to have a little privacy awareness. They often see posts asking how to turn off the shutter sound and flash of N73 camera. In fact, to put it bluntly, it is to prevent candid shots.