Like zip, it can include a number of files in one encrypted archive. The 7z command works like zip, but touts a surprisingly impressive compression ratio. Since zip is a tool intended to create archives, you can add multiple files to your encrypted bundle by adding them on the command line. Like gpg, zip does both encryption and compression, so the resultant file size should be considerably smaller than the original. You just have the add the -encrypt option. The command does, however, also support encryption. The zip command is generally used to compress files and to collect files into archives for easy storage and transport.
The gpg command only works with one file at a time. Notice the nice reduction in the resultant file size and that original file is still intact. Things to keep in mind when preparing to encrypt a file include how you intend to use it (e.g., secure backups, transfer to another system), how you manage keys so that you can decrypt the file when needed, and whether the original file remains on the original system or is encrypted "in place" - you are left only with the encrypted version of the file. Some commands compress by default others do not. In fact, the encryption process might make some files larger.
Encryption does not generally reduce the size of files unless compression is used as well. This post compares some of the commands for encrypting files and provides an easy script for trying them out.Įncryption means, of course, that a file that you can look at with Linux commands and tools is altered in ways that make it unusable and unreadable unless you reverse the encryption process. When you want to limit access to file contents, you can use file permissions but file encryption makes limiting access much more effective. There are numerous commands for encrypting files on Linux.
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