By now many of you might have come to know about the importance of backing up the data.To make the backed up data much more secure we have to encrypt the data so that,those who know the password can only check the data.
If you have ssl installed on your system, you can use it to encrypt your backup.
echo "your_key" > /tmp/.key
to save your data =>
tar cvf - files_to_save | openssl enc -des3 -salt -pass file:/tmp/.key >/dev/rmt0
to restore your data =>
openssl enc -d -des3 -pass file:/tmp/.key </dev/rmt0 | tar xvf -
NOTE:DON'T FORGET THE /tmp/.key file WHEN YOU ARE DONE WITH IT.!!!!
Where,
* /dev/rmt0 : Tape device name.
* openssl : The OpenSSL toolkit command line utility.
* tar : The tar archiving utility.
* des3 : Triple-DES Cipher (Triple DES is the common name for the Triple Data Encryption Algorithm).
* -salt : The -salt option should ALWAYS be used if the key is being derived from a password unless you want compatibility with previous versions of OpenSSL and SSLeay. Without the -salt option it is possible to perform efficient dictionary attacks on the password and to attack stream cipher encrypted data. The reason for this is that without the salt the same password always generates the same encryption key. When the salt is being used the first eight bytes of the encrypted data are reserved for the salt: it is generated at random when encrypting a file and read from the encrypted file when it is decrypted. (source enc man page)
