hi all
sorry my poor english..
but you need encrypt that large file in symetric way. use the asymetric way ( public/private key par) to encrypt the symetric key. Em 17/12/2014 15:58, "Markus" markus.scharitzer@gmail.com escreveu:
On 17/12/14 18:54, Leon Fauster wrote:
Am 17.12.2014 um 18:42 schrieb Les Mikesell lesmikesell@gmail.com:
On Wed, Dec 17, 2014 at 11:14 AM, Xinhuan Zheng xzheng@christianbook.com wrote:
I have a requirement that I need to use encryption technology to
encrypt
very large tar file on a daily basis. The tar file is over 250G size
and
those are data backup. Every night the server generated a 250G data
backup
and it¹s tar¹ed into one tarball file. I want to encrypt this big
tarball
file. So far I have tried two technologies with no success.
- generating RSA 2048 public/private key pair via ³openssl req -x509
-nodes -newkey rsa:2048 -keyout private.pem -out public.pem² command
and
uses the public key to encrypt the big tar file. The encryption
command I
used is "openssl smime -encrypt -aes256 -in backup.tar -binary
-outform
DEM -out backup.tar.ssl public.pem². The resulting backup.tar.ssl
file is
only 2G then encryption process stops there and refuse to do more.
Cannot
get around 2G.
What happens if you use a pipeline or redirection instead of the -in and -out files? I regularly write large tapes with something like: openssl aes-256-cbc -salt -k password <input.tar.gz |dd bs=10240 obs=10240 of=/dev/nst0 Not quite the same, but there does not seem to be an inherent size limit in openssl as long as it is not handling files and it happens at a reasonable speed so it must be using the intel hardware support.
Furthermore - is there the need to use "one" big tar file? Despite having a capable workstation/server handling such big files, it has also advantages splitting such backups (e.g. man split) ...
-- LF
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Is it possible for you to use gpg? You could do something like: tar zcf /something - | gpg -e -r otherkey | cat - > backup.tgz
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