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6

That's obvious: to test whether your system hardening has worked out and that your TCP/IP stack will not be flooded by ping flooding any more... E.g. that your system won't keel over by dropping the enormous amount of ICMP packets that it receives.


5

From usn-2497-1 it is stated you need to upgrade to ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.2. To me that is the same as your 4.2.6p5 though yours is shortend. Update instructions The problem can be corrected by updating your system to the following package version: Ubuntu 14.10: ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.10.2 Ubuntu 14.04 LTS: ntp ...


5

IMPORTANT EDIT With the commands: xdotool windowunmap <window_id> and xdotool windowmap <window_id> it turns out there is a way to completely mask the presence of application windows temporarily. Even the wmctrl -l command will not list the windows any more. I will post the new answer below and leave the first answer as a second option. ...


3

The default umask is 022, which allows group and others read permissions (and execute, where applicable) (or 002 if User Private Groups are enabled). If you have a problem with that being the default, file a bug. If you want to change the default, edit /etc/login.defs and change UMASK 022 to UMASK 077 And then do: chmod og-rx -R ~


3

This can be used to check if the network is reliable or if it is overloaded. The usual one ICMP message per seconds would be too slow for such purposes. Please note that 100 ICMP packets per seconds is very far from being a DOS attack in today's networks. That is only about 150 KB/s even if you specifically send unusually large ping messages.


2

If using the graphical interface or the adduser command to create the users, you can modify this in the file /etc/adduser.conf as explained in the manpage, by changing DIR_MODE from 0755 to 0700 or whatever you want. Also, for useradd, see this answer in SuperUser's forum.


2

The method to restrict access on Ubuntu is with apparmor. https://wiki.ubuntu.com/AppArmor Firefox comes with an apparmor profile for Firefox which has been specifically developed with security in mind. as pointed out by Rinzwind , ro access is not necessarily a security problem. Large programs such as firefox is not the best of examples as firefox has ...


2

Privacy Indicator lets you change some privacy related settings in Unity and remove some automatically collected data. But it's likely far more important to configure your web browser to protect your privacy and to be careful where you enter what kind of information on the web.


2

Public key encryption is really only useful if you want to have other people encrypt messages to you, and you don't want to go to the trouble of secretly giving them your secret encryption key. So you post your public key for the world to see and encrypt messages to you, that only you can read. It would be of no benefit to you personally encrypting your ...


1

All computers can suffer from viruses and viruses, including Linux. Very few viruses exist for Linux so, users sometimes don't install antivirus software. Personally, I like to recommend antivirus software or antivirus protection for servers and necessary and business computer systems. For private computers, it is up to the user to determine if they want ...


1

It is a lot harder to get a virus on Linux than Windows as the kernel code for each machine with Linux installed is different, even if you use the same CD or .iso image on another machine. With Windows the kernel code is the same. You can install an antivirus if you want for added security. There are many FREE antivirus programs out there for Linux. Just be ...


1

MAC spoofing is what you do when you tell your NIC (Network Interface Card, which can be wireless too) to use a different address for communication on the local network (the segment before the first router). This MAC address is not (at least with IPv4) visible on the outside, so you will not gain any security from spoofing it. The main reason for spoofing ...


1

I usually like to start with Google. When I install something new and want to find out how to interact with it I'll search for something like "Things to do after installing Ubuntu", or "Top Ubuntu Apps", or "Ubuntu for beginners". After a while I start to get the hang of new things and eventually become more and more proficient. Ubuntu is a great OS for ...


1

Yes, there are. However the leaks are coming from the proxy server and not from your computer. If the proxy server is being used by many people it would be somewhat harder (although not impossible) to link the DNS leaks back to you.


1

To remove Remmina, our default remote desktop search for it in Ubuntu Softwar Center or type on a command line ... sudo apt-get purge remmina Same for samba ... sudo apt-get purge samba Mind though: samba is used for cross platform file and printer sharing and is only installed if you have Windows partitions. When you remove this you will not be ...


1

Yes, there is: it is called the chroot environment (see http://en.wikipedia.org/wiki/Chroot).


1

If he is plugging in a USB, whether is is set up U3 or as a HID device, I believe it will always show up in dmesg. As far as an unplug alert, you would essentially follow these udev rule instructions, substituting "add" for "remove"


1

This could be due to a number of different causes: The websites with that problem are misconfigured. It's relatively common for a website to mistakenly mix secure and non-secure content, triggering a warning. The warning is legitimate - you shouldn't consider the site secure if it has non-secure contents because your browser requests for those contents ...


1

The only way to ensure that a PPA is "safe": Download the source packages published in that repository and check the source code contained in these source packages. Also, before installing updates on your machine, you would have to re-check the PPA to see if a new source package has been uploaded and audit that new source code. Obviously, most users are ...



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