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Select File > Info. Select the Protect Workbook box and choose Encrypt with Password. Enter a password in the Password box, and then select OK.

Share your workbook Select Share. Set permissions. Allow editing is automatically checked. Uncheck this if you only want to give permission to view the file, not edit it. ... Enter the names or email addresses of who to share with. Add a message (optional). Select Send. Or, select Copy link to get a link to the file.

No. At best, password-encrypted Excel sheets are only protected at rest, not while opened. At worst, it's not encrypted and/or an adversary can use one of several documented MS office password recovery attacks.

Examples of Unauthorized Access Asking to “borrow” or taking another employee's badge. Trying to “piggyback” by following another individual through access doors. Logging on to a computer using a co-worker's password or credentials.

Workbook-level: You can lock the structure of your workbook by specifying a password. Locking the workbook structure prevents other users from adding, moving, deleting, hiding, and renaming worksheets.

How to Secure an Excel File via Password Before Sharing It Select file -> info. Select the “Protect workbook” box and choose “Encrypt with Password.” Enter a password in the password box, and then select “Ok.” Confirm the password in the “Re-enter password” box, and then select “Ok.”

The Protect Workbook option in the Info menu also indicates that the workbook's structure is protected. To view this option, click File > Info > Protect Workbook.

Protect an Excel file Select File > Info. Select the Protect Workbook box and choose Encrypt with Password. Enter a password in the Password box, and then select OK. Confirm the password in the Reenter Password box, and then select OK.

Protect the workbook structure Click Review > Protect Workbook. Note: The Windows option is available only in Excel 2007, Excel 2010, Excel for Mac 2011, and Excel 2016 for Mac. ... Enter a password in the Password box. Important: ... Retype the password and click OK.

Password Protecting an Excel File Select file -> info. Select the “Protect workbook” box and choose “Encrypt with Password.” Enter a password in the password box, and then select “Ok.” Confirm the password in the “Re-enter password” box, and then select “Ok.”

AES since Office 2007 At present, there is no software that can break this encryption. With the help of the SHA-1 hash function, the password is stretched into a 128-bit key 50,000 times before opening the document; as a result, the time required to crack it is vastly increased, similar to PBKDF2, scrypt or other KDFs.

Share your Excel workbook with others Select Share. Select permissions and then Apply. Add people. Type a message if you like. Select Send.

Open the sheet or workbook that you want to protect. On the Review tab, click Protect Sheet or Protect Workbook. In the Password box, type a password, and in the Verify box, type the password again. Choose any other protection options you want and click OK.

Unauthorized Access is when a person who does not have permission to connect to or use a system gains entry in a manner unintended by the system owner. The popular term for this is “hacking”.

Encryption takes security a step further by converting the file's contents into a complex code that's difficult to decrypt without the encryption key. That means even if someone accesses your file, all they'll see is scrambled data. Microsoft uses AES-256 encryption, one of the most advanced encryption algorithms.