Configuring Compression and Encryption. How to comress/encrypt files before uploading.
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Compression and encryption - Table of Contents

Compression and encryption overview

New version of S3 Browser allows you to automatically compress and encrypt files before uploading them to Amazon S3.

It uses the ZIP format for data compression and AES 256 symmetric algorithm for data encryption, allowing you to decompress/decrypt files using any modern archive manager.

You can also decompress and decrypt files automatically when downloading them using S3 Browser. If password is not found on the local computer, you will be asked to enter it before downloading the file(s).

Compression and encryption can be easily configured using flexibe set of rules. You can configure rules on bucket, folder or file level.

Below you will find detailed description of compression and encryption rules.

Managing compression and encryption rules

To open Compression and Encryption rules manager:

Click Tools -> Compression and Encryption

Tools, Compression and Encryption

Click Tools -> Compression and Encryption

Rules manager dialog will appear:

Compression and Encryption rules editor

Compression and Encryption Rules Editor

To add new Compression/Encryption rule

1. Click the Add button

Add new Compression/Encryption rule dialog will appear:

add new rule dialog

Add new Compression/Encryption rule dialog

2. Fill out the following optional fields:

Bucket name or mask: - Identifying one or more buckets to which the rule applies. Empty bucket name means all buckets.

Remote file name or mask: - Identifying one or more files to which the rule applies (e.g. docs/* or *.xls). Empty file name means all files.

Check Compress files before uploading checkbox to compress files before uploading them to Amazon S3, you can also specify Compression level. Better compression takes more time and CPU/memory, lower compression is faster and requires less resources.

Avoid enabling compression for already compressed files such as jpg, gif, png images, compressed video files, archives (zip, rar, 7z, etc.). Be also careful when enabling compression for very large files, this may take a lot of time and CPU resources.

Check Encrypt files before uploading checkbox and specify Encryption password if you would like to encrypt files before uploading them to Amazon S3.

Compression/Encryption rules are stored in plain form, so you may want to delete them when upload is finished.

You can also temporarily enable/disable the rule using corresponding check-box.

3. Click Add new rule to close dialog

4. Click Save to close rules manager and save changes

To edit Compression/Encryption rule

1. Select the rule you want to edit and click the Edit button

Edit Compression/Encryption rule dialog will appear:

edit rule dialog

How to edit Compression/Encryption rule

2. Edit rule details and click Save Changes

3. Click Save to close rules manager and save changes

To delete Compression/Encryption rule(s)

1. Select one or more rules you want to delete and click Delete

how to delete the rules

How to delete Compression/Encryption rule(s)

2. Click Save to close rules manager and save changes

Downloading compressed/encrypted file(s)

When you download compressed/encrypted file(s) using S3 Browser, it decompresses it automatically after downloading is finished.

If file is encrypted, S3 Browser looks into compression/encryption rules and if corresponding encryption rule is found, the password is taken from the rule to decrypt the file.

If no matching rule is found, you will be asked to enter decryption password.

Decryption Password not found dialog

You can specify decryption password when downloading encrypted files

The following options are available:

Enter decryption password - you can specify decryption password for the file(s)

Download encrypted file 'as is' - decryption is not performed, the file is downloaded in encrypted form.

Do not download this file - the file will be skipped

You can also check the Remember my choice for other files in the queue checkbox to apply your choice for other files in the queue.

If the password you specified is not valid, you will see the following dialog:

Password is not valid dialog

You can re-enter decryption password when downloading encrypted files

The following options are available:

Enter decryption password - you can re-enter decryption password for the file(s)

Do not decrypted this file - decryption is skipped, the file is downloaded in encrypted form.

Decompressing/Decrypting files without S3 Browser

If you downloaded compressed/encrypted files via other tools, or via old version of S3 Browser, you can still decompress/decrypt them using any modern archive manager.

You can use free open-source archiver 7-zip:

1. Start 7-zip archive manager, select the file(s) and click Extract

extract files using 7-zip

How to decompress/decrypt files using 7-zip

2. Specify decryption password if files are encrypted and click OK

7-zip-confirmation-dialog

You can also specify password in 7-zip archive manager

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