Microsoft gives you the ability to encrypt files on your network using the Encrypted File System. Windows provides a means of securing file system data through encryption.
The Windows Encrypting File System EFS allows users to encrypt and decrypt files on the fly, while offering an effective security mechanism that is essentially transparent to the user. Providing file system security with EFS All Windows platforms, including Windows Professional, include EFS, which allows users and administrators alike to protect the file system from unauthorized access.
EFS is primarily intended to protect the file system on a computer that is not physically secure. However, systems that are physically insecure are a candidate for EFS. For example, any notebook that contains company-sensitive data should use encryption to protect its contents. Consider the thefts in recent years of notebook computers—many of which contained sensitive information—from government employees in public airports and even government offices, and you can appreciate the need to protect your own portable data.
Protecting notebooks is just one use for EFS. Desktop systems that are publicly accessible, such as those in public offices, courtrooms, government offices, and other locations where the public has access to systems and where the systems contain sensitive or private information, should be protected by EFS to prevent data theft and the potential embarrassment, legal trouble, or even loss of business that could ensue.
In the server realm, removable storage devices such as Storage Area Network SAN devices that contain sensitive data should be protected through encryption. It only takes one unscrupulous or disgruntled employee to hand a drive over to your competition to destroy your company.
Using EFS, users can encrypt, decrypt, access, move, copy, and rename their files. EFS is set up by default so that users can automatically begin encrypting their files at any time. It automatically creates an encryption key pair for users when they encrypt their first file or folder as long as they do not already have one. Encryption is managed through Windows Explorer or the cipher command line utility.
To encrypt a file or folder, simply right-click the file or folder and choose Properties from the pop-up menu. Click the Advanced button and then add a check mark to the "Encrypt contents to secure data" check box see Figure 8. Decrypting and Encrypting Data using the Cipher Command.
An alternative way to configure data encryption is to use the cipher command from a command line. If you are encrypting a folder , a Confirm Attribute Changes dialog box will pop up, asking you whether you would like to encrypt only the folder, or the files and subfolders within the folder as well. If you choose the latter option, any files and subfolders that you add to the encrypted folder will also be encrypted see Figure 8.
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