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In Excel and Word 95 and prior editions a weak protection algorithm is used that converts a password to a 16-bit verifier and a 16-byte XOR obfuscation array [1] key. [4] Hacking software is now readily available to find a 16-byte key and decrypt the password-protected document. [5] Office 97, 2000, XP and 2003 use RC4 with 40 bits. [4]
Cryptographic service providers can be used for encryption of Word, Excel, and PowerPoint documents starting from Microsoft Office XP.A standard encryption algorithm with a 40-bit key is used by default, but enabling a CSP enhances key length and thus makes decryption process more continuous.
JExcel is a library (API) to read, write, display, and modify Excel files with .xls or .xlsx formats. API can be embedded with Java Swing and AWT . [ 2 ] [ 3 ] [ 4 ]
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The only type of password that can prevent a trespasser from gaining access to a document is the password to open a document. The cryptographic strength of this kind of protection depends strongly on the Microsoft Excel version that was used to create the document.
File locking is a mechanism that restricts access to a computer file, or to a region of a file, by allowing only one user or process to modify or delete it at a specific time, and preventing reading of the file while it's being modified or deleted.
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1. From the inbox, click Compose. 2. In the "To" field, type the name or email address of your contact. 3. In the "Subject" field, type a brief summary of the email.