5
votes
1answer
220 views

Authentication by Signing or MAC?

I'm still new to security, so I'm sorry if this question doesn't make sense or if I'm completely off base with something. I've got some messages I want to encrypt (probably with AES-256-CBC) and send ...
1
vote
3answers
1k views

How can i reject connection from LAN and WAN to some ports?

Scanning with nmap, I discovered that there are 3 open ports on my server. I want to deny any access to these ports from any machine, regardless of whether it is on the same LAN or via WAN. How do I ...
2
votes
1answer
537 views

Does SQL Server CE 4 decrypt data securely?

I am going to store data in an encrypted SQL Server CE 4 database, where the database is doing the encryption. (Note that SQL CE is the embedded version, not the fully installed server.) When the ...
6
votes
3answers
1k views

Why are SSL certificates valid only from a certain date?

Each SSL certificate is valid starting from a specific date and up to the expiration date. What's the point in that "valid from" date? Why do we want a certificate to only be valid after a specific ...
2
votes
3answers
2k views

Is it possible to block emails (to all email accounts) that contain certain word/phrase patterns?

A friend of mine has been cyber-stalked for 4 years now by an ex-boyfriend. He recently worked out her new job email address (via LinkedIn) and started sending her emails. She told me that the emails ...
8
votes
1answer
6k views

Use client SSL certificates as web application authentication

I'm working on a web application with simple API needing authentication. For my application nature, users have two RSA keys, for signing and encrypting messages. My protocol works based on it. The ...
5
votes
4answers
790 views

Hashing a key: less entropy than the key itself

A web API needs to store a 'key' for authentication, in much the same fashion as a password but at 128 characters. My concern is that the salted SHA1 hash for the key has less entropy than the key ...
1
vote
2answers
120 views

How do I sanitize and check large numbers that will be sent to an unmanaged BigNum library like GMP?

I need to process data that is sent by users in a LargeNumber format. My current choices are BigInteger (.Net Managed Code) IntX (Managed Code, faster for some operations) GMP / MPIR (Unmanaged ...
6
votes
2answers
12k views

Test firewall rules (Linux)

I have a question about how to test the firewall rules. To be more specific, for academic purpose I have to set up a machine which will accept all kind of packets o a specific interface. I added an ...
5
votes
3answers
978 views

Tools helps: First time cracking passwords

I am trying to crack passwords on two Windows member servers (2003 and 2008). There is no Active Directory. Each user seems to use the same password across servers, workstations, etc. I have access to ...
5
votes
3answers
935 views

is it safe to allow external images to be attached to Blog or any Web content?

I am filtering all images that attached to any content of my blog: Check for file extension. Check content type using $finfo = finfo_open(FILEINFO_MIME_TYPE); I also save the image temporary on my ...
3
votes
4answers
1k views

FireFox's restore previous session restores logins authenticated by server's sessions

In a website I'm building when I login, close FireFox, open FireFox and try to go to the website again I must login again (as expected) BUT if I select "Restore Previous Session" I am logged in again. ...
4
votes
4answers
1k views

Site constantly getting infected

I am the webmaster of some websites running Typo3, 2 of which are getting infected constantly. These 2 sites are being owned by the same client. Something happens on those 2 sites that causes ...
2
votes
2answers
6k views

How to configure iptables for must open ports?

On my machine there are web services which can be accessed from any PC connected to the same network segment (WiFi for example). I want to use IPtables on the machine to prevent any web services from ...
-2
votes
3answers
299 views

Basic Algebra and How it Applies to Information Security? [closed]

I'm an undergraduate student at Kaplan University and one of my projects in my Algebra class is to be able to identify two concepts that we've learned thus far and how they might apply towards my ...
18
votes
3answers
4k views

Anything to do about old gpg keys?

Quite A few years ago (in middle school) I created some gpg keys, published them to a keyserver, etc. because I was l33test kid on the block. Now I have gone through a few new computers and OS's, ...
3
votes
3answers
546 views

Client-Side Hashing to decrease value of password guessing heuristics

Yes, this is 'yet another client-side hashing' question. But, don't leave yet, I think there is some value here. I'd like to do something to mitigate the affect on the community as a whole when my ...
18
votes
2answers
1k views

PHP attack string in access logs

So one of the Invision Power Board installations on my server was recently compromised. I found what seemed to be the attack (using PHP in the query string and carefully crafted cookies), and I ...
7
votes
2answers
513 views

How to keep using Java 6 securely, despite its unpatch vulnerabilities

Given that Java 6 is now deprecated by Oracle and there recently has been notification of a 0day (that will exist forever now that Oracle is not patching JRE6), what can we do to prevent drive-by ...
-1
votes
1answer
16k views

How to install Cisco VPN Client on Windows 7 64bit [closed]

I have Win7 64bit. Have Cisco VPN Client winx64-msi-5.0.07.0440-k9. Now i try to install it. But after i click first "Next" button in istaller i get error: "installation ended prematurely because of ...
2
votes
3answers
488 views

Account lockout with human interaction required to unlock

I just got locked out yet again from my university's system for typing the wrong password twice, then mistyping the correct one by accident. Now I have to call the helpdesk or go there myself to reset ...
1
vote
1answer
456 views

Key authentication with ssl

Can i authenticate myself in SSL with a key, just like in SSH?
2
votes
1answer
518 views

Can a Javascript - WebGL proof of work system prevent website spam?

Is it a good idea to come up with a Javascript-based Proof of Work system to reduce spam on forums, and other websites? This idea would be similar to HashCash, but the computation would be based on ...
7
votes
1answer
1k views

Choosing an SSL certificate provider

Does it make any difference which provider I get my SSL/TLS certificate from? In particular, what are the pros and cons getting an SSL certificate from Verisign vs getting one from Thawte? Which one ...
-1
votes
1answer
328 views

What are correct steps to setup this exploit execution(jboss_invoke_deploy)?

I've found this vulnerability (http://www.metasploit.com/modules/exploit/multi/http/jboss_invoke_deploy) but can't seem to set proper values for exploit to work , payload shown on site gives me worn ...
0
votes
1answer
1k views

Can I ensure that a public key derived from a private key is unique?

In asymmetric cryptography, is it possible to ensure that public key derived from a given private key is unique, no matter the algorithm?
0
votes
3answers
187 views

DDOS protection for instant messenger server

I developed an instant messenger which uses TCP ports for its communication, and hosted the server application on a VPS account from some hosting company, but the first day I got attacked by a ...
2
votes
3answers
3k views

How dangerous is game guard?

Game guard is an anti-cheating application used with MMORPGs . I have read that such applications acts as rootkit over the pc. How dangerous it is to play MMORPGs that uses this application? How ...
12
votes
3answers
590 views

Is it inconsistent to tell users to “not click on password links in email”, and requiring clicks on “forgot password” links?

On one hand, IT Security shops have been telling users to not click on links in email because they can do damage to your computer, or phish your personal information. Many of those issues are ...
2
votes
2answers
2k views

Windows Update - Interception

I'm trying to monitor the HTTP requests/responses made when performing a Windows Update. I have a Windows 8 machine configured with a proxy in IE. I've also imported via netsh for winhttp: netsh ...
4
votes
2answers
316 views

Evernote hacked - precautions?

On March 2, 2013, the digital note taking system Evernote was hacked. Evernote has forced new passwords and have released new updates to Windows, Windows phone and iOS of their client software. ...
4
votes
1answer
225 views

What are possible consequences for applications that depends on Safe Mode for security?

PHP finally removed safe_mode feature: Safe Mode Warning This feature has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0. The PHP safe mode is an attempt to solve the ...
-1
votes
1answer
4k views

What does -Pn option mean in nmap? [closed]

I am trying to do a nmap scan on a machine in my home network. When I do the regular scan (using nmap 192.168.2.10 or nmap -sP 192.168.2.10), the results say host is down. However, when I use the ...
0
votes
2answers
193 views

Security implications of forwarding ports 1-10000 on Airport Express?

Today I found that ports 1-10000 were being forwarded on an Airport Express that I as well as a fair number of other people share. This was setup by another user. There are multiple machines and ...
4
votes
2answers
541 views

Can a virus infect source code files with dangerous data?

If a user was infected with a file altering virus is it possible that checked in code (files containing text) to the source control could contain dangerous properties. I ask this after this got me ...
-3
votes
2answers
338 views

Automatic robot crawler to check web pages authenticity?

Our servers seem to be commonly hacked, mostly injecting malicious codes/frames to our web pages or changing downloadable files with backdoors and so on. Is there any tool that can crawl our website ...
2
votes
3answers
2k views

Why we use GPG signatures for file verification instead of hash values?

for example here they put a gpg signature to verify what you download is what they really made. but why they just don't put a SHA256 hash value ? because its much more faster to check it and sometimes ...
2
votes
2answers
1k views

how to bypass “header” in php

While reading an article I encounter an interesting thing I did not know about: if(!isset($_SESSION['usr_id']) || !isset($_SESSION['usr_name'])) { header('Location: index.php'); } ...Which ...
0
votes
2answers
281 views

No where to run, no where to hide - suggestions to improve personal security needed

I think that as a windows user, I have no where to run and no where to hide. In the windows world no matter how many precautions I take, I can get infected by - 1 - Drive by on legal and popular ...
26
votes
3answers
2k views

Stack Overflow is www.doioig.gov/? If not, then could I be infected

Great! I made a post recently where I mentioned that my system might be infected. Now something new came up. When I search for Stack Overflow on Google, I see that the URL is www.doioig.gov/. When I ...
4
votes
1answer
3k views

Is it possible to exploit XSS inside User-Agent header? [duplicate]

I've found an xss bug inside user-agent header on one popular buy/sell site , and after reporting it to them , they answered that it is not dangerous as it can not be exploited without user ...
0
votes
2answers
202 views

Necessary education for InfoSec? [closed]

So, as it stands I'm a 21 year old recent Bio-Chemistry graduate looking for a path into InfoSec. Without a background in any computing discipline I assumed that it would be seen as compulsory that I ...
0
votes
5answers
1k views

NMAP scan fails

I started to read a metasploit guide book so I set up 2 Machines in VirtualBox for pen testing (host - BT 5, the second - WinXP SP2). When Im trying to scan open ports with NMAP on the Windows ...
6
votes
3answers
919 views

How can I practice using nmap without scanning some real site or performing computer trespass?

I want to learn nmap and its various options. What can I do or setup in order to see examples of issues found by nmap - e.g., something with security holes on purpose.
0
votes
3answers
235 views

Odd Server Logs

I have a webapp running using Django. I recently activated some middleware which is supposed to alert me of 404's where the referrer is within my domain (supposedly indicating a 404 that is my fault). ...
5
votes
2answers
1k views

Entering sensitive information into non-SSL site that uses secure iFrame

There is a website that tenants can use to pay their rent. That website uses an http address but apparently uses a third-party product, which embeds an iframe into the page. The source of that iframe ...
2
votes
1answer
330 views

Normalizing Windows Advanced Firewall rules

How can I best normalize our Windows Advanced Firewall rules while implementing network segmentation? I want them to be as clear and concise as possible for audit purposes. What few examples I've seen ...
-1
votes
3answers
4k views

Why doesn't Advanced IP Scanner show machine name? [closed]

I am using Advanced IP scanner to view all the machines at my home. However, it just shows me only one machine but not the other. However, I am able to ping to the other machine. The network discovery ...
5
votes
3answers
13k views

To DMZ, or not to DMZ

So for an assignment, we need to create a scheme (and eventually also the set-up) of a couple of servers in a network. The 'networks' are: Internal network DMZ The internet And the servers we ...
11
votes
3answers
5k views

What elliptic curves are supported by browsers?

Wireshark'ed Firefox 3 request. Their names are nowhere documented. Elliptic curve: secp256r1 (0x0017) Elliptic curve: secp384r1 (0x0018) Elliptic curve: secp521r1 (0x0019) What are the supported ...

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