Security | Rock'n Root

Free s/mime certificate from startssl

I wanted for my site to get free ssl to use https. A search on the net brought me here:https://www.startssl.com/. After registration, I got it, but it’s a completely different story … By the way, it turned out that it was very easy to get a s / mime certificate for your mail (no matter which domain).

How to get a free s/mime certificate?

First, in your account, you need to check your email with the Validations Wizard:

a notification will be sent to the email

After that in “Certificates Wizard” you can choose “S/MIME and Authentication Certificate” and get it.

It is saved in the browser automatically, and it needs to be imported for use in mail client.

p.s. to build a chain your mail client may need (for example, I have kmail / kleopatra) StartCom CA Certificates. It’s enough to go to the Toolbox tab and download everything that’s there and then import it into the mail client / certificate manager.

update. In 2016, there were problems with ssl from this company. Perhaps, it is better not to use them. In any case, it’s better to check everything.

How to encrypt a backup and upload it on ftp or sftp?

If you need to upload backup to a third-party ftp-server (archive, just a file), however, you need to ensure that important information does not fall into the wrong hands, before uploading, encrypt it with a password and then upload it.

We encrypt the file with the openssl command

openssl aes-256-cbc -salt -in FILE -out FILE.aes -k PASSWORD
(openssl there are in most Linux distributions, and you can also install it in windows and mac os)
To request a password, you need to remove the “-k PASSWORD”.
You can decrypt with the command
openssl aes-256-cbc -d -salt -in FILE.aes -out FILE -k PASSWORD

How to upload to ftp (using curl best)

curl -s -T FILE -u USER:PASSWORD ftp://ftpserverhostname

How to upload to sftp

rsync -avz -e ssh USER@PASSWORD:/remote/directory/ /current/directory/file

How to upload to sftp with curl

short answer – use rsync over ssh and do not suffer 🙂

How to use truecrypt in windows

It is assumed that the latest correct version of TrueCrypt (7.1a) is already installed.

For comparison, hash should be:
md5 – 7a23ac83a0856c352025a6f7c9cc1526 TrueCrypt Setup 7.1a.exe
sha256 – e95eca399dfe95500c4de569efc4cc77b75e2b66a864d467df37733ec06a0ff2 TrueCrypt Setup 7.1a.exe

After installation, open the program and start creating an encrypted repository:

Next – select the file container

Next – choose a standard volume

Next – come up with the name of the file inside which there will be an encrypted container and choose the path where it will lie:

Next – you can configure the encryption settings (you can leave it as is)

The size is chosen based on how much space will be needed for the data. To fit everything, it is better to use a minimum of 16GB flash drives. To make the container file fit on the flash drive, you need to make it the size = the size of the flash drive minus 10%, that is 8GB USB flash drive – 7.2 GB (simpler 7GB); 16GB flash drive – the file is 14.4 GB (simpler than 14GB). Also, if the container file is larger than 4gb, you will need to format the flash drive in the ntfs system (note that on the USB flash drives there is usually a fat32 file system that does not support files larger than 4gb, so if you need to transfer container file to a regular flash drive, then container must less 4gb).

In the next window, you need to invent a password and remember it (if you lose it, the data inside the container is probably impossible to recover). After that, you will need to click Next and the Format button:

At the end of the operation, it again suggests creating a container, so click Exit. The container is created 1 time. After that it can be used, as shown in the screenshot:

that is: select a free mount point (in this case drive E), then select the file itself, then click Mount (enter the password when prompted).
Now you can open the “My Computer” folder and go to the drive by the letter you selected. This is the encrypted repository (container) of information. At the end of the job, you will need to click Dismount to properly disconnect the container.

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