Bosses, let’s get straight to the point. Anyone who is engaged in technology knows that the current core code, design drawings, and customer data are the lifeblood of the enterprise. But the most troublesome thing is not external hackers, but often internal ones - core programmers copy the source code over disagreements, package design drafts in batches before leaving, and some even sell company secrets to rivals for personal gain. I have been working on data leakage prevention for more than 20 years and have seen this kind of thing too much. If the money is gone, you can make it again. If the core code is lost, the company may close down directly.

If you don’t want to be honest today, let’s talk about one thing: how to encrypt files so that you can truly prevent “insiders” and help you sleep soundly at night.

A must-see for bosses! 4 hard-core file encryption methods, don’t let the core code run naked overnight”

1. Deploy the Insight Eye MIT system

In this industry, when providing encryption for enterprises, the plan must be implemented and cannot be frivolous. The Insight Eye MIT system is one of the few people I have ever seen that can incorporate "prevention of leakage" into their bones. It is not just a piece of software, it is more like a "smart lock" for corporate data, and it is the kind of lock that will immediately call the police if someone wants to pick the lock.

1. Fully transparent encryption, employees have no clues, and there is no way for secrets to be leaked : This is its core hard skill. Boss, you don’t have to worry about employees complaining that “encryption is too troublesome”. It runs automatically in the background and is completely transparent to the source code and drawing files specified by the company when used internally, so employees can work as they should. But as long as someone dares to send it out through WeChat, USB flash drive, or email, the file will be a string of garbled characters that no one can understand. This trick directly cuts off the idea of ​​copying from the root.

2. Outbound control, add "tracker" to files” : Many times, documents have to be sent to customers and suppliers. Traditional encryption gets out of control as soon as it is released. Insight Eye MIT system can do this. You can set the number of times to open the outgoing files, the validity period, and even prohibit printing and screenshots. Sending out documents is like flying a kite, the string is always in your hand. After the other party has finished reading, the file will be automatically destroyed when the time is up. Do you want to resell it again? There are no doors.

3. Clipboard and screenshot control to plug the last loopholes : When you encounter a "ghost" who knows a little bit about technology, he will use virtual machines and screenshot software to steal data. This system directly manages the clipboard (copy and paste) and screenshot functions. Any unauthorized screenshot operation will either cause a black screen or trigger a background alarm, and the administrator's mobile phone will receive a notification immediately. This is equivalent to blocking all the ways for those who want to steal data using "original methods".

4. Detailed audit logs give leakers nowhere to hide. : What the boss fears most is “not knowing who did it”. The Insight Eye MIT system will record in detail who, at what time, what sensitive files they tried to access, and whether there were any illegal outgoing files. Something really happened, and this diary is the irrefutable proof. It is also a powerful deterrent at ordinary times - employees know that every step of their operations is traceable, and they must first weigh the consequences before thinking wrongly.

5. Offline strategy can prevent even if the network is disconnected : Some employees will take their laptops home, thinking that they won’t be able to take care of them if the internet is disconnected. This system supports offline policies. Even if the device is unplugged from the network cable, the set encryption policy will still take effect. Should files be encrypted or not? Should they be opened or not? This completely blocked the "physical isolation" leakage path.

2. WinRAR/ZIP compression and encryption

This method is old-fashioned, but it is used by the most people. Select the file, right-click, compress and encrypt, and set a password. The cost is almost zero.

The effective effect... Frankly speaking, it is "to guard against gentlemen but not against villains". If you send the password to your colleagues via WeChat, it means it is not encrypted. If you meet someone knowledgeable, there are brute force cracking tools everywhere on the Internet. If the password is a little simple, it will be broken for you in a few minutes. This method is suitable for dealing with some unimportant internal temporary files, or you just want to give yourself some "psychological comfort". Want to use this to protect core code? That's no different than sticking a safe key on the door.

3. BitLocker/VeraCrypt full disk encryption

This is what Microsoft comes with, or use the open source VeraCrypt. The principle is to encrypt the entire hard drive. If the computer is lost, others cannot read the data even if they dismantle the hard drive.

Sound awesome? Yes, but it has a fatal logical flaw: It only protects against lost computers, not insiders . Just imagine, an employee who is working normally has logged in to the computer normally and the system is in a decrypted state. At this time, he wants to copy your code and drag it away with a USB flash drive. Can BitLocker handle it? It only cares about the "door" and not the "inside the house". The probability of your company's computer being stolen is far less than the probability of key employees stealing it. Expecting it to prevent leaks is a wrong approach.

4. Permission control of enterprise cloud disks (such as Ding, Feishu)

Many companies now use online collaboration platforms, which have their own permission settings, such as "browse only" and "no downloading."

This is a good idea, but it has too many limitations. Permission management is extremely cumbersome. There are dozens of files in a project, and if the permissions are set slightly wrong, either everyone will not be able to work, or the permissions will be in vain. More importantly, large files such as core code and drawings are not suitable for real-time collaboration on cloud disks. Moreover, as long as you enable the "online preview" permission, employees with better front-end skills can still pull out the source files from the cache. This thing is a master at collaboration, but it is still a few steps behind at security encryption.

Source of this article: China Enterprise Data Security Alliance, CSO Information Security Internal Reference
Leading expert: Chen Weidong
Editor in charge: Liu Zhenguo
Last updated: March 28, 2026