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There are many applications that have the ability to encrypt attachments. An example is provided here for WinZip™, with the caveat that this is not the only acceptable method, and unless very carefully configured, WinZip would not fit the Federal Information Processing Standard (FIPS) which is defined byFIPS 140-2. The minimum acceptable encryption is AES 256-bit for PSIs.

1. Open a folder to the location of the file(s)/folder(s) that you wish to encrypt.
2. Select the file(s)/folder(s) that you wish to encrypt. Note that in order to select more than one file/folder, you must press the “Ctrl” key on the keyboard while selecting them.
3. 右键单击选中的项目之一。
4. Select WinZip. From the submenu that appears, select “Add to Zip File.”
5. In the “Add Files” dialog box, specify a ‘File name’ and ‘Destination’ (location) for the finished Zip file.
6. Select “.Zip” as the Compression Type.
7. Under Encryption, check the “Encrypt files” box.
8. Click the “Add” button.
9. 可能会出现一个弹出窗口，提示“在使用此特性之前，您应该了解各种加密方法的优缺点。请按F1键获取更多信息，特别是如果您是第一次使用加密。”选择“OK”按钮继续。
10. In the “Enter Password” field, enter an appropriate password. Passwords must be at least eight characters and must contain at least one of each the following: a lowercase character (a-z), an uppercase character (A-Z), a number character (0-9), and a symbol character (!, @, #, $, %, ^, &, *, etc.).
11. In the “Re-enter Password” field, enter the same password from Step #10, and remember the password for future reference.
12. Click the “OK” button.
13. A pop-up window may appear saying “Add Complete. Your files have been added. The files will be compressed and encrypted when saved.” Click the “OK” button to continue.
14. The encrypted WinZip file should be in the location identified in Step #5 above.
15. The password must not be included in the same message and should either be included in a separate email or verbally provided to the intended user.