Security in terms of "computer security", such as protection of information, protection from theft or data destruction.

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Ranked Order of Security for Encryption Algorithm Preferences: For GPG

GPG & PGP negotiate the encryption & hashing algorithm to use based on the recipient key's prioritized list of supported algorithms. The problem is DES/MD5 are forced to be included as the ...
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0answers
10 views

Network security issue. Cannot access https websites

I am having an issue with my network. I cannot access any https website because it gets wrong certificates. Here is what I get: Attackers might be trying to steal your information from ....com. ...
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3answers
947 views

How is uniqueness of MAC addresses enforced?

Again and again I read that devices are uniquely identified by their MAC addresses. But how are MAC addresses determined? (And do they tell us anything about the device which they represent?)
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1answer
40 views

Strange user in my External drive's Security Properties

Here is the image showing the odd user in my External drive settings. Its only inside my external drive. Not my main one. What does this user represent? More confusing stuff inside external ...
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0answers
25 views

Strange temporary “Access denied” error accessing encrypted file

After a system reboot (Win7 x64), an application (Pidgin) reported that it couldn't access a file (blist.xml) in its subdir under AppData\Roaming\. The subdir was encrypted. Accessing the file with ...
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9answers
8k 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 ...
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2answers
2k views

Is it stupid to forward a router port to my computer for Magic Packets (Wake On Lan)?

I recently finished a little project that allows me to remote into my home computer from basically anywhere (registered for a free sub-domain and forwarded remote desktop ports from the router to my ...
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2answers
1k views

Tool for managing large numbers of SSL certificates

My organisation has a lot of SSL certificates and managing them is a pain: we need to keep backups of private keys and certificates, keep them secure, deal with certificate renewals (we use different ...
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1answer
2k views

Force Chrome to Ignore a "weak ephemeral Diffie-Hellman public key”

With the update of Chrome to v45, it's blocking access to pages with weak ephermeral Diffie-Hellman public keys. I understand that this is due to Logjam. I understand that switching from https to http ...
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3answers
8k views

Do I need to have a passphrase for my SSH RSA key?

Before I started at my current job (at a small business), my office had no firewall on the network and literally nothing was ever being backed up. Now that I've signed on as a dedicated sysadmin / ...
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1answer
95 views

How to change encryption algorithm for private key file using OpenSSH 5.3

Using ssh-keygen, I need to generate a SSH private key file where the encryption algorithm used when using a passphrase is AES-128 with CBC mode. I know this is the default for OpenSSH >= 5.4 as per ...
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1answer
5k views

Automatically lock screen of Chromebook when lid is closed

Can a Chromebook be configured to automatically lock the screen when I close the lid? There is a discussion in If someone steals my chromebook while it's off, will him be able to see my cached data? ...
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1answer
2k views

Server: Microsoft-HTTPAPI/2.0 running on port 10234 on my Windows 7 pc?

I've recently set up a home server and spent some time working on the security. One of the tools I've been using nmap which I pointed at my Windows 7 desktop. It showed an unknown service on port ...
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3answers
898 views

Does a nmap scan against my own IP go past the firewall?

I'm trying to secure my computer against local network attacks for when I'm at university or a LAN party. Does running a nmap scan against my own IP go through the firewall or does it bypass the ...
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2answers
2k views

What does tor NEWNYM in tor do?

Can someone explain to me (in layman terms if possible) what sending tor the signal NEWNYM does? I have read in several blogs that it should improve performance and/or improve anonymity but I could ...
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1answer
4k views

Can't change or set password in Windows 7

I'm trying to set up a new user in a Win7Pro computer. The computer has HP ProtectTools enabled. I cannot set the password from within HP ProtectTools or the User Accounts control panel, when logged ...
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3answers
176 views

Understanding file permissions

What is the ending r for and the leading d for in file permissions on Linux? Example: drwxr-xr-x I know about the user, group, others part, and I know w=write, r=read, x=execute. But I don't know ...
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3answers
15k views

How to use OpenVPN through a restrictive firewall?

I'm currently in the situation of attempting to setup OpenVPN on a personal VPS, for connection primarily through an overly restrictive firewall. All of the setups mentioned below work when used ...
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1answer
1k views

How to spoof the MAC on a wifi, Linux Mint 17, with NM?

I can't find a reliable way to spoof my mac. If I use the "clone MAC address" on network manager (I use Linux Mint 17, Cinnamon), I can't connect to my wifi. I tried everything, unless I remove the ...
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1answer
21 views

filtering/removing potential dangerous content from word files?

Word (.docx) files can be dangerous. I often receive word files from other people, which may or may not be safe. For the most part, I am only interested in getting the textual content, like text and ...
4
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1answer
868 views

Was this a DDoS, a hack attempt, or something else?

I SSH’d into my home server earlier because it was taking strangely long to respond to HTTP requests. I noticed that the shell prompt was also acting slow. So I typed top, and saw several instances of ...
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0answers
28 views

Share a photo with inability to download it [closed]

When you share a photo on the internet how can you disable the download the photo in an original jpeg format to the end-user's computer, i.e. make it difficult to create a copy of the photo. (Not ...
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2answers
72 views

Importing GPG Key

I am trying to import a GPG key to verify a download. I have never done this before, so bare with me. The Key ID is 4203454C. Let me know if you need any more information. What is the process for GPG ...
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0answers
22 views

How to secure a virtualised web server

I do front end web development for clients and have a local webserver that acts as my production/staging ground The webserver is virtualised on a windows 7 machine that has Ubuntu installed within a ...
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2answers
16k views

How to display the last user logged in Windows 7 PRO x64 logon

I want Windows to show the last user logged, so I only need to type my password, and I don't need to select my username. I thought it should be the default Windows behavior, but I've just installed a ...
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1answer
87 views

Same SSL Cert on 2 Servers, 1 Passes & Other Doesn't

I run a few small sites, and last year installed SSL certificates on each of them. Last week a visitor contacted me with a question about my SSL certificate, which prompted me to run a couple of SSL ...
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2answers
46 views

How can a forwarded email know the forwarded-to email address?

I received an email with a coupon offer and viewed it within webmail (should not matter which provider). I wanted to print my offer, but my printer was down, so I forwarded the email to a friend so ...
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2answers
134 views

Mozilla Firefox won't connect to Google, IE can

I have went on to Google search before, however today, Mozilla Firefox won't let me connect to Google's search page. This is what I get. You have asked Firefox to connect securely to ...
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1answer
27 views

Can't edit Local Security Policy in Windows 7

I'm trying to add users to the Access this computer from the network User Rights Assignment policy but the 'Add' button is disabled: I'm connecting to the machine via RDP using the local ...
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2answers
2k views

How to make the Firefox's message “… is now fullscreen” less obtrusive?

Illustration of the problem When a web page in Firefox switches to full-screen then even though the website is allowed to switch to full-screen automatically (Tools > Page Info > Permissions > Enter ...
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1answer
25 views

log password for ssh login failures

I'm managing a server and i wonder if it is possible to log the password used for a failed connexion attempt. In the auth.log, there is the user but not the password. it's just for an informative ...
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0answers
7 views

Is user data compromised if JWT is intercepted? [on hold]

I have read many articles about using JWT for authentication and they make it clear that JWT is NOT encrypted and that the server will reject a modified JWT because the signature will be invalid. ...
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1answer
13 views

How should I record metrics on code that is being used by many people?

I have code (let's say a bunch of Python scripts) being used by many people (on a common AFS network). I would like to be able to collect metrics on the usage of the code (compile times, run times and ...
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36 views

What are some ways of bypassing SSL and HTTPS site blockers/security? [closed]

What are some ways of bypassing SSL and HTTPS site blockers/ security? I have a job at In-trek Co. here in Europe and they taught us some basics of how to bypass socks4 and socks5 security software. ...
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3answers
2k views

ping not working in a chroot

How can I use the ping command in a chroot environment? $ ping 8.8.8.8 ping: icmp open socket: Operation not permitted Currently I am using CentOs, but ideally there must be a solution that works ...
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1answer
30 views

Make Firefox warn before allowing user to visit non-HTTPS website

I want to avoid accidentally visiting websites served over unencrypted HTTP. How can I configure Firefox so that it will warn me if I attempt to visit such a site? Ideally: this shouldn't need an ...
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1answer
6k views

Name resolution for the name…timed out after none of the configured DNS servers responded

I am getting this message in system event during my PC startup Name resolution for the name website.com timed out after none of the configured DNS servers responded. And another same message ...
0
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1answer
11 views

Choosing the correct security settings on Thomson TCW750-4 router

Should I leave both WPA-PSK and WPA2-PSK enabled on my Thomson TCW750-4-router? From trying to google it, I get the impression that just leaving the latter enabled will be more secure but that it may ...
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1answer
28 views

Basic Security Configuration for Router Base Configuration?

I'm trying to build a decent base configuration and I'm just a little curious if features like IPS and SPI need to be setup explicitly? This network isn't going to be integrated in with our users, but ...
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3answers
7k views

How can I edit banknote images in Photoshop CS?

While designing some personal stuff, I encountered troubles copy-pasting a banknote image into Photoshop CS2. I saved a Dollar bill from the web to my desktop, but trying to open it, even ...
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1answer
4k views

Robocopy copying files from source to destination in backup mode and with file security permissions intact

I need to utilize robocopy to mirror files and folders from one shared location to another shared location, in restartable backup mode with security permissions. My current command is: robocopy ...
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1answer
27 views

Taking Over Ownership

So I took ownership over a folder and then I deleted the folder. Does that effect ownership security of the rest of folder in mast folder? Folder I deleted was a duplicate I made, it was nothing ...
0
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1answer
59 views

Does Windows 10's “reset PC and clean the drive” correctly clean the drive?

I'm resetting my Windows 10 laptop and deleting all my personal files to give it. When I asked Windows to reset, I found what seems to be a new option : "clean drive", that claims to make data ...
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6answers
6k views

Removing the “Open File - Security Warning” in windows 8?

I like to study a lot of code from various sources from around the internet, and a big part of that involves downloading and opening the files to view the source code. Now every time I try to open ...
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0answers
12 views

Run our own Certificate Authority for internal use only: safe or not? [migrated]

According to the guide at How to Run Your Own Certificate Authority, my company intends to issue our own digital certificates for internal use only (the Managers will sign PDF documents to send the ...
2
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3answers
360 views

what is the purpose of UEFI SecureBoot?

I heard that new computers will have a "secureboot" feature built in, and that it's supposed to keep "unsigned code" from booting. I haven't seen any issue with a possibility to boot the wrong OS,as ...
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3answers
113 views

Why bother stopping 'root' from ssh login?

Best practice is to remove the ability of 'root' to login over ssh. However, I need to run some Ansible commands and am currently connecting via a user called "amdhske" and then have set this user up ...
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0answers
19 views

OpenSSL listen and decrypt automatically

I want to design an application to connect my server using OpenSSL and send encrypted data (encrypted with server public key) to specified port on server like 4433. All client using server public key ...
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1answer
15 views

Only allow whitelisted IP addresses to try to connect in fail2ban

My auth.log is littered with connection attempts from nasty zombies. It is really annoying. And the server doesn't even permit password logins. What I would like to do is set up fail2ban to only ...
3
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2answers
118 views

How to avoid an insecure initial connection on public Wi-Fi networks before the VPN is enabled?

It’s a best practice to use VPN when you connect to public Wi-Fi networks. However, in the scenarios I am aware of, you first connect to the network and only then—after connected—switch to VPN. In ...