The protection of computer systems and information from threats such as theft or data destruction.

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43
votes
1answer
3k views

Short, easy to understand explanation of GPG/PGP for nontechnical people?

Does anyone have a link to a good, but short (1-2 paragraphs) explanation of the benefits of using GPG/PGP signing and encryption for Email focused at non-technical readers? That is, why would someone ...
39
votes
4answers
22k views

Which of the Windows updates are really necessary?

I downloaded a lot of Windows updates in the automatic mode. Are they all necessary? Can I remove some of them? How do we know which ones are necessary?
19
votes
6answers
1k views

Should I worry about malware on Linux? [closed]

I don't run an antivirus on Linux ( most people I don't AFAIK ) and I'm not at all concerned about any form of malware or spyware or any other_bad_ware. Should I by concerned? Of course I don't ...
15
votes
2answers
29k views

Are the insides of LCD monitors dangerous?

I have an LCD monitor that is cracked. So far nothing leaks out but if something starts leaking should I be concerned? I have searched and read everything from: It is safe to be around and ...
7
votes
3answers
699 views

Security on wireless mouse and keyboard

At work I am using a wireless mouse and keyboard. I was sitting at my desk this morning wondering if and how they are secured against key loggers. What stops another device from listening to my ...
4
votes
9answers
2k views

Virus protection for flash drives

At school, there is a large network with lots of non-technical minded people and lots of viruses. How can I protect my flash drive from these worms and viruses so I don't bring them home and infect my ...
3
votes
1answer
12k views

How can I disable the “Open File Security Warning” when I want to run downloaded executable files?

I would like to disable the "Open File Security Warning" that says "Do you want to run this file?" whenever I double click on an .exe I download. I have Windows 7 Home Premium, so I don't have the ...
12
votes
3answers
13k views

Are saved Remote Desktop credentials secure on the local machine?

Are saved Remote Desktop credentials secure (loosely speaking) on the local machine? They aren't stored as clear text anywhere at least, are they? Edit: I understand the inherent risks of saving ...
12
votes
4answers
8k views

Linux Group Permissions not being enforced correctly.

I am running Ubuntu 10.04 server and am having some very counter-intuitive experiences with users/groups. For example: sudo touch test_file # create empty file sudo groupadd test ...
3
votes
2answers
6k views

Windows - Decrypt encrypted file when user account is destroyed

I have a Virtual Machine running on my Windows Server 2008 computer that originally was received by me encryped, as the builder of the VM did it on a MAC, which decrypts files by default. I never ...
1
vote
1answer
785 views

forgot wireless password

If you have a laptop running XP that is able to connect to a wireless network fine, but you don't know the password it's using, is there any way to find it out so that a second laptop can also ...
3
votes
5answers
6k views

How can I limit other (administrator) users access to my profile?

We in our club have a computer with Windows 7 Professional that every club member may use. And everyone has their own separate account. Those accounts have to have administrator priveleges since I ...
2
votes
1answer
4k views

Is there anyway to remove denied permissions from a group for a folder if I dont have access?

I'm hoping the answer is yes. Due to my ignorance, I denied the 'Everyone' group all read access from one of my folders containing needed information because I did not want people on my network being ...
1
vote
3answers
349 views

Prevent admin users from reading my files [duplicate]

My surface tablet is shared with a friend. She uses a separate account, with admin rights. Being an admin, she is able to gain access to all my files. Even my OneDrive files. I guess I could follow ...
100
votes
15answers
165k views

How to wipe free disk space in Linux?

When a file is deleted, its contents may still be left in the filesystem, unless explicitly overwritten with something else. The wipe command can securely erase files, but does not seem to allow ...
122
votes
13answers
78k views

How to reliably keep an SSH tunnel open?

I use an SSH tunnel from work to go around various idotic firewalls (it's ok with my boss :)). The problem is, after a while the ssh connection usually hangs, and the tunnel is broken. If I could at ...
86
votes
8answers
27k views

My colleague often shuts down my machine through the LAN - how do I prevent it?

This might sound weird. My colleague and I were working on a Windows machine. He frequently shuts it down through the LAN. He usually follows these steps: Access command prompt, enter shutdown -i. ...
70
votes
13answers
115k views

Which TrueCrypt Algorithm is the safest?

If performance is of no concern, which TrueCrypt algorithm is the safest to use? AES Serpent Triple DES Twofish AES-Twofish AES-Twofish-Serpent Serpent-AES Serpent-Twofish-AES Twofish-Serpent
28
votes
6answers
10k views

How to put fear of God (law) into Wi-Fi hacking neighbors [closed]

I live in an apartment and some new guys have apparently moved into one of the apartments. They have been shamelessly hacking into my WiFi. Mine was initially a WEP encrypted network and out of ...
51
votes
6answers
30k views

What is better for GPG keys - RSA or DSA?

ssh-keygen defaults to creating RSA keys, but gpg --gen-key prefers DSA/ElGamal. Which one - RSA or DSA - is better for GPG?
31
votes
8answers
143k views

How to remove security from a PDF file?

I am trying to fill out some docs, but the provided PDFs are "SECURED", meaning I can't use FoxIt's typewriter tools. Is there any way to remove the security?
53
votes
5answers
3k views

How do anti-viruses work?

So I was thinking about viruses recently, and wondering how exactly antiviruses keep up? Considering anybody who'd been coding for a few weeks could hack together something do do nasty, nasty things ...
35
votes
1answer
3k views

How to find source process of unknown popup in Windows 7

A random popup appears in Windows 7 titled as Information with a progress bar and a clock. The window sometimes says Please wait a moment..., and the progress bar moves very slowly and disappears. ...
39
votes
6answers
48k views

scp to remote server with sudo

I have a file on server A (which is behind a NAT so not directly addressable). The file needs to be copied to server B in a directory restricted to root. I have an account on server B with sudo ...
20
votes
6answers
15k views

Wipe RAM on shut down to prevent Cold Boot Attack

My system is encrypted using Full Disk Encryption, i.e. everything except /boot is encrypted using dmcrypt/luks. I am concerned about Cold Boot Attacks, where researchers demonstrated, that content ...
27
votes
17answers
8k views

How can I physically destroy data from a failed HDD?

I have a broken HDD that contains sensitive data. Since no software can access the disk, I can't wipe it using any of the tools generally suggested. Breaking the disk physically into very small ...
8
votes
3answers
3k views

Remote into Linux workstation behind a firewall

Let's say I have a Linux workstation at work, behind a firewall. So even though I may have a remote access server set up on it (such as the most excellent NoMachine NX Server), I can't access it from ...
15
votes
5answers
5k views

Steganography software

Do you know some good (better if FOSS and cross-platform) steganography software that runs on GNU/Linux? The features I'm searching are: steganography software (better if FOSS and cross-platform) ...
11
votes
8answers
28k views

Firefox: This connection is untrusted + Behind corporate firewall

I've seen some similar issues strewn throughout Google's results about this, but none seem to be corporate-specific. I continually get the 'This connection is untrusted' screen every time I attempt ...
11
votes
4answers
4k views

Recommended offline on-demand virus scanners

I have never run full anti-virus on my Windows XP systems. Instead I use various anti-malware tools to manually perform scans every few weeks. This approach, combined with Windows updates and ...
26
votes
5answers
61k views

Malicious “confirm navigation” dialogs?

Some sites, like StackExchange, pop up an "Are you sure you want to leave this page?" dialog when you try to leave under certain conditions, such as if you have a post you haven't finished editing. ...
35
votes
5answers
4k views

Can I permanently prevent Java security updates from installing Yahoo Toolbar?

Each time I get a Java security update, I have to remember to untick the box to install the yahoo toolbar browser plugin that they've decided, for some mad reason, is an important security feature of ...
11
votes
10answers
926 views

What are the possible ways to prevent laptop theft? [closed]

How can I prevent laptop theft? What are the possible ways to secure the laptop itself and any data on the laptop? I have seen anti-theft cables in malls. Can I use these in my home? Will laptop ...
7
votes
1answer
4k views

How to report a malicious site to Google, Microsoft, Mozilla, etc. so that they will warn users [closed]

I completed a project a year ago. Now a few modification were needed. While trying to test the site, there was an index.html file with a malicious script which had an iframe to another site's jar ...
6
votes
3answers
29k views

Find out if a PC has a TPM chip installed?

I have several Windows XP laptops that I need to check to see if they will work with Bitlocker if I install Windows 7. If they have a Trusted Platform Module (TPM) chip then Bitlocker should work ...
3
votes
4answers
3k views

Internet monitor/filter solution for home network

I am looking for a simple and cheap way to monitor/filter internet usage on my home network. The solution should not be machine or OS specific, and it needs to be somewhat difficult to circumvent. ...
19
votes
2answers
15k views

Is zip's encryption really bad?

The standard advice for many years regarding compression and encryption has been that the encryption strength of zip is bad. Is this really the case in this day and age? I read this article about ...
17
votes
9answers
129k views

Is there a way I can password protect a dropbox directory on my work pc?

I use dropbox a lot, and I'd like to start using my Dropbox account on my work PC, however I want to prevent anyone else from being able to access the files in my dropbox folder other than me on my ...
13
votes
8answers
3k views

Do computer system units actually go up in flames?

There's a strong belief amoung non-technical people that home computers should not ever be left on unattended - since they are electrical devices and can go up in flames and set the room on fire. Now ...
8
votes
2answers
4k views

How to “flush tor circuit”

On Windows I have used XBBrowser, which provides a custom version of Firefox suited to using Tor. XBBrowser provides a button, flush tor circuit, which will setup an entirely new connection and exit ...
8
votes
6answers
2k views

Do I really need a firewall?

I've been using the Nod32 security suite for some time now, and out of all the others that I've tried, it's great (low memory footprint, fast, fairly cheap). However, I've been installing a lot of ...
6
votes
4answers
11k views

Take a webcam photo on login using Windows 7

How do I set up my webcam to capture an image on the sly each time my account (or any account) logs on? Is there some specific software that will do this? I have a Logitech QuickCam Fusion cam and ...
3
votes
4answers
20k views

How can I monitor and report file copy activities in Windows XP?

I have some developer machines that part-time developers come and work on. I want to monitor and report if they copy any files to external media or attach files to their email accounts (and so on). ...
12
votes
5answers
64k views

Multiple instances of conhost.exe

My desktop has two instances of conhost.exe running in the background at all times. Some googling brought up a few articles, like this one, but they don't explain why I have multiple instances of ...
11
votes
5answers
13k views

Is it possible to encrypt home folder on windows 7?

Ubuntu and MaxOS has an ability to encrypt home folder in case laptop is stolen. Is it possible to do same thing on Windows 7? I need to encrypt home folder so it will be encrypted and decrypted ...
10
votes
14answers
56k views

How to disable Utility Manager (Windows Key + U)

How do I disable the Windows + U hotkey in Windows XP? Alternatively, how do I stop the utility manager from being active? The two are related. The utilty manager is currently providing a potential ...
8
votes
1answer
6k views

Automatically lock screen on lid close in Windows 7

I'm a longtime Linux user, and I just recently got a laptop that runs Windows 7. I recently stepped away from my workstation for a few minutes, and returned to find, to my horror, someone else sitting ...
7
votes
7answers
2k views

Am I secure from network monitoring software if HTTPS is used?

I will be logging into my bank account and my personal email accounts at work. Its not banned at work, but I just don't want them to save/log a copy of whatever I do with these services. Especially my ...
1
vote
1answer
3k views

Password Protecting Partitions on an External Hard Drive

I'm looking forward to the suggestions I get back on this one. Here's the rundown: I'd like to have an external hard drive to use as a backup for my household. Ideally I'd like to be able to take ...
13
votes
2answers
54k views

Lock your computer after 5 minutes of inactivity

I know you can automatically Sleep and Hibernate your computer with a timer. But these affect running programs and stop downloads ... so I was wondering if there is a way to automatically Lock your ...