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

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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. ...
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 ...
54
votes
6answers
31k 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?
51
votes
5answers
4k views

What are the potential security issues when I keep using Windows XP? [closed]

Microsoft stopped updating Windows XP and the media warns us of security leaks. I actually just read that continuing to use Windows XP is "extremely" dangerous. Why exactly is this such a danger? I ...
22
votes
4answers
37k views

How does a hacker in a public WIFI actually view your computer?

I've read that they can see what sites your viewing or even access your computer if you're connected on the same WIFI connection but how exactly?
27
votes
18answers
2k views

How to prepare your PC or laptop for theft [closed]

Of course preventing them from getting stolen is the top priority, but invariably, someone is going to get jacked. What are some good practices to minimize the damage incurred when your PC is stolen? ...
35
votes
1answer
4k 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. ...
44
votes
6answers
51k 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 ...
42
votes
19answers
19k views

Destroy a hard drive without proper equipment

I need to make two hard drives unreadable. Unfortunately, I have some constraints which make this harder than usual (in particular, they rule out the answers to other questions): I don’t have a ...
20
votes
6answers
16k 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 ...
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 ...
29
votes
5answers
66k 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. ...
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
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 ...
9
votes
4answers
39k views

Locking down a Windows 7 PC to just a browser

I have been tasked with building several PCs to act as secure kiosks that allow users to view and use an intranet site at my company. Our LP staff will cover physical security, so that is not a ...
9
votes
6answers
31k views

Secure video chat program as an alternative to Skype [closed]

I'm looking for something similar to skype but basically just for me to video chat with my girlfriend. Skype has been kind of buggy lately with its recent iterations and doesn't seem to be progressing ...
35
votes
5answers
5k 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 ...
7
votes
1answer
5k 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 ...
20
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 ...
15
votes
2answers
32k 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 ...
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 ...
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 ...
4
votes
3answers
2k views

Is it feasible to crack ZIP passwords?

I have a piece of software I have to install on company laptops. The installer needs a serial to work properly, but I don't have it (my manager isn't here so I can't ask him). The installer tells me ...
3
votes
4answers
21k 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). ...
13
votes
5answers
69k 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 ...
13
votes
5answers
14k 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 ...
13
votes
2answers
60k 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 ...
10
votes
14answers
57k 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 ...
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 ...
9
votes
5answers
6k views

Are .docx or .pdf files potentially dangerous?

Just a general question of computer security - if I download a .pdf or .docx from an untrusted source, can it seriously harm my machine/give a malicious user access to my information? Or is it ...
4
votes
10answers
10k views

Unintentional mouse movements, am I paranoid?

I have noticed for a few months that my mouse will randomly jerk across the screen. I'm super paranoid about security. But this is just silly! Has anyone else experienced this, and found out what ...
4
votes
2answers
6k views

How can I secure an Ethernet-over-power network?

I just bought myself an Ethernet-over-power adapter, and plugged it in. It seems to be working great, but now I'm concerned that my neighbours may be able to access my network. I live in a rowhome ...
1
vote
3answers
2k views

How do you block specific urls and not entire domain

I want block a URL on specific computer, in this case www.google.com/reader but i not want to block the entire domain of google. It is for my work machine as I don't seem to have enough self control ...
0
votes
5answers
4k views

Could local ISP capture my location whenever i launch a VPN to a VPN server?

I am extremely concerned that my ISP collects any information once I am connected to a VPN server. For instance, as far as I know, when I start a connection to a HotSpotShield VPN server, an IP ...
155
votes
19answers
187k views

How do I list the SSL/TLS cipher suites a particular website offers?

How can I retrieve a list of the SSL/TLS cipher suites a particular website offers? I've tried openssl, but if you examine the output: $ echo -n | openssl s_client -connect www.google.com:443 ...
152
votes
9answers
23k views

Is it really possible for most enthusiasts to crack people's Wi-Fi networks?

Can most enthusiastic users (even if they are not professionals) use well-known techniques to break through the average home router's security? Some basic security options are: strong network ...
122
votes
9answers
9k views

What is the danger of inserting and browsing an untrusted USB drive?

Suppose someone wants me to copy some files to their USB stick. I'm running fully-patched Windows 7 x64 with AutoRun disabled (via Group Policy). I insert the USB drive, open it in Windows Explorer ...
12
votes
3answers
19k views

Simple built-in way to encrypt and decrypt a file on a Mac via command-line?

Are there any built in command-line tools that I can encrypt and decrypt a text file (and provide it some sort of password).
59
votes
6answers
4k views

Is there a point in installing antivirus on Ubuntu?

I have recently started using Ubuntu. I am wondering about the point of installing antivirus programs on Ubuntu. On SuperUser, I found the opinion that it only detects "windows viruses" and removes ...
11
votes
4answers
4k views

What are possible security issues with an SSH daemon?

I'd like to be able to SSH to my Ubuntu 10.04 office PC from the outside. I am thus thinking to start up an SSH daemon on the PC. What are the security issues, possible glitches, specific ...
36
votes
18answers
31k views

How can clients easily and securely send me passwords? [closed]

I often need to get passwords from clients for FTP, SSH, MySQL, Authorize.net, etc. What's an easy way for them to send me passwords securely? Maybe even without them needing a login/password? ...
54
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 ...
26
votes
7answers
2k views

How can I protect myself while using public wifi hotspots?

I frequently need to access secure resources (gmail, banking, remote desktop, etc) while on public wifi hotspots. What can I do to ensure that nobody can sniff my passwords or my other browsing ...
18
votes
16answers
4k views

Password manager for multiple computers? [closed]

Is there a password manager that I can use on multiple computers, to remember all the passwords I use on the sites I visit?
39
votes
4answers
23k 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?
25
votes
8answers
17k views

Linux keylogger without root or sudo! Is it real?

Somebody on Youtube claims to have a keylogger on Ubuntu that was neither executed nor installed as root. The link below shows a demo of it working. http://www.youtube.com/watch?v=Y1fZAZTwyPQ ...
15
votes
4answers
7k views

How to hide Browser Plugin Details in firefox for more privacy?

I'm trying to trick the results in this page to have more privacy/anonymity: https://panopticlick.eff.org/index.php?action=log&js=yes So far the best I could do is change the user agent, with the ...
22
votes
3answers
6k views

Is it possible to store arbitrary data in an image file?

Is it possible to store arbitrary data such as documents or a program in the form of an image file, such as a PNG image? My concern is that someone could encode data for use by malware into an image ...
19
votes
6answers
160k views

Access denied even though I'm an Administrator?

My user account on Windows 7 is part of the Administrators group which has a full control permissions on C:\inetpub\wwwroot: However, when I try to create a folder in it, I get the "access denied" ...