How to compress and encrypt files with 7-Zip | Information Technology Services Office

If you intend to send a large PPT with embedded photos and graphics via messaging, it is recommended to first compress to reduce the size of content before sending. You can also add an additional layer of protection by encrypting document with sensitive information and set a password for decrypting the content before allowing it to be readable.

By encrypting your files, only the person with the password can decrypt / open the files. This can help to prevent unauthorized access to the sensitive information.

Check out the simple steps below to encrypt and decrypt a file with 7-Zip.

To Encrypt a File

1. Right-click the file you want to encrypt, select “7-Zip” and then click “Add to archive”.

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2. Select the archive format (e.g. zip), define a strong password and then choose “AES-256” as the encryption method. Click “OK” when finished.

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3. An encrypted and zipped file is generated and you can send the file to your recipient. Please be reminded NOT to send the password and the encrypted file in a single email. Send it in a separate email or through other means like by phone.

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To Decrypt a File

1. Right-click the encrypted file, select “7-Zip” then click “Extract Here”.

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2. Enter the password and then click “OK” to decrypt the file. The file CANNOT be decrypted if the password is not correct.

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For further information or assistance on file encryption, please contact the IT HelpCentre at 2766 5900.