Kingsoft Spreadsheets 2009 can secure an Excel (.XLS) workbook with strong 128-bit RC4 password encryption. This is standard functionality and no additional file encryption software is needed. This article describes how to use password encryption in a secure way. If the instructions are followed properly, the result is an encrypted spreadsheet that can only be opened by entering the correct password.

Encrypt the spreadsheet on save

You can easily encrypt a spreadsheet, all encryption settings are found directly on the Kingsoft Spreadsheets Save dialog. Do the following to start the encryption process:

  1. Open Kingsoft Spreadsheets.
  2. Click File – Save As….
  3. Click the Encrypt… button.

Kingsoft Spreadsheets 2009 Save and Encrypt

Set the document password

Document security is based on the document password. A strong password is hard to guess but easy to remember. To be safe, we recommend a minimum password length of 10 characters. Click the Advanced… button to select the Cryptographic Service Provider (CSP).

Encrypt Spreadsheet Password

Choose the encryption type

A Cryptographic Service Provider (CSP) is a set of algorithms used for encoding and decoding. The default CSP is Office Standard. This is a CSP with publicly known security issues. Spreadsheets that are secured with the weak Office XOR or Office Standard encryption type can be cracked easily. It is recommended to choose a provider with at least 128-bits in the key length. Starting with the Microsoft Enhanced Cryptographic Provider v1.0, the length is 128bits and should provide adequate security.

Select Encryption Type

You can read about all the encryption types from Microsoft.

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