Many network administrators know OpenSSL as a tool that implements Secure Sockets Layer (SSL) and Transport Layer Security (TLS) cryptographic protocols to secure your web surfing and email. But as we learned earlier this month, OpenSSL can do far more. With OpenSSL you can encrypt and decrypt files, verify file integrity, and see which encryption protocols and ciphers any server supports.
If you want to keep your files from unauthorized access, Linux file encryption tools like GnuPG, EncFS, and TrueCrypt are excellent and easy to learn, but you don’t need another application to encrypt files if you already have OpenSSL. For instance, the command below encrypts a single file, in this example file-test. You can name your output file anything you want, or you can omit the output file spec if you want to print the file to your screen.
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