0
votes
1answer
3k views

Ban MAC address from website? [duplicate]

Possible Duplicate: Can I block based on Mac Address? I have a situation where I need to ban a MAC address from accessing my webserver. (Windows Web Server 2008 R2). Is this possible? P.S. ...
1
vote
2answers
1k views

Open Source tool to block email attachments

Is there any way to stop users from sending attachments over Gmail or any web based email including private mail servers, if internet access is through a Linux box running Ip Tables/Squid etc. We are ...
6
votes
4answers
9k views

Bank account number and account holder in check exposed?

I'm not sure if this is standard practice in all banking institutions but almost all banks where I've received checks the account number of the issuer is exposed (some even the account name). Isn't ...
10
votes
4answers
941 views

Source code security

We have about 20 developers working in a heterogeneous environment, mostly using company laptops or desktops. We run Windows 7 on desktops/laptops and a mixture of Linux distros (Ubuntu/CentOS). ...
5
votes
3answers
1k views

TLS Renegotiation Indication Extension vulnerability

I am trying to understand the TLS Renegotiation Indication Extension from the RFC. I can understand that it is related to the fact that the renegotiation is sent under the encrypted stream, but I ...
4
votes
2answers
2k views

Do you require a special type of certificate for using Diffie Hellman as the key exchange protocol in SSL?

In Diffie Hellman key exchange technique both the parties aggree on a common parameter g then they generate their private parameters a and b . Then they exchange g^a and g^b. now they can calculate ...
4
votes
1answer
1k views

Encrypt Medicare card numer in C# in ASP.NET

I am giving a free consultation for a non profit organisation that wants a simple system to manage multiple groups with a schedule component, etc. and also manage the medical informations of the kids. ...
0
votes
3answers
235 views

Is HTTPS necessary for password change if user has already logged in with HTTPS?

I notice many websites implementing HTTPS for changes in account information even though the user has already logged in through HTTPS and tracked by SESSION. Is this really necessary?
5
votes
3answers
252 views

When form submission fails, password field gets blanked, why is that the case?

I've recently asked a question about blanking the password fields in UX for usability purposes, but It seems all the sites use this approach for security reasons. Why is it insecure to post back the ...
3
votes
2answers
304 views

How can I report an ecommerce site in violation of security practices?

I ordered a product from a website and found that their invoice display page is completely un-protected with the order id in the query string and merely incrementing the number exposes every order. ...
-5
votes
0answers
75 views

IP Adress Spofing via ncat,nc etc [duplicate]

Possible Duplicate: Netcat IP Spoofing I want to ask one question to you. My friend and i playing game together.He is using below command this computer. ncat -u -c /bin/bash --allow ...
30
votes
4answers
40k views

Why is passing the session id as url parameter insecure?

I recently followed a discussion, where one person was stating that passing the session id as url parameter is insecure and that cookies should be used instead. The other person said the opposite and ...
12
votes
3answers
2k views

Is it bad to only sign some of a domain's emails with DKIM?

Is it OK if I sign a subset of domain emails, or is this an all-or-nothing game? We use Amazon's Simple-Email-Service for sending e-commerce emails. We would like to sign these with DKIM. This same ...
2
votes
3answers
943 views

Downside of allowing uncertified Certificates

I've seen Firefox poping up the message "Untrusted Connection" where self signed certificates are involved. However, I could not understand what the following means (in bold) : XXXX.XXXX.XXXX:8443 ...
3
votes
1answer
350 views

Trial version security

I am developing stand-alone software in BDS 2006. I want to provide a trial version for 6 months -- the user can use it for just 6 months, but no more on a particular system. I have handled most ...
2
votes
1answer
3k views

encryption key rotation

I am creating an web application which processes user information. As a part of application we are storing this input user information and generated output on server. Since this input and output is ...
42
votes
5answers
83k views

Why most people use 256 bit encryption instead of 128 bit?

Isn't 128 bit security enough for most practical applications?
1
vote
2answers
287 views

X509 mutual authentication: is there a security flaw?

On the client side, my application accepts the server's certificate in case of the client certificate being signed by this server cert. Is this correct or may it be dangerous? Is it better to ask a ...
4
votes
1answer
2k views

how do extended validation X.509 certs work?

https://www.forumatic.com/ uses an extended validation cert. wikipedia.org's entry on extended validation certs says that a cert is known to be an extended validation cert if the OID in the ...
7
votes
3answers
13k views

What does these warnings mean on an SSL connection by firefox (only)

I am connecting to a secure site and firefox mentions about identity: Owner: This website does not supply ownership information Verified by: Not specified Technical Details: Connection ...
2
votes
0answers
173 views

Lastpass - Can I just keep the previous autofills? [closed]

I just installed the Lastpass Firefox plugin, and it seems like a useful tool thus far. The only thing that drives me crazy is that I am used to the Firefox saved passwords where it will show the last ...
2
votes
1answer
238 views

What would the high priority steps be for securing a small (cloud) application?

No doubt there is much good information at this link on hardening a linux server and at the child links off of that. And at this link to relevant tools it seems there has not yet been a popular ...
0
votes
0answers
20 views

What are some real world examples of screened subnet firewall architecture? [duplicate]

Possible Duplicate: Public DMZ network architecture screened subnet firewall architecture has a DMZ the outisde world doesnt know about the inside network beyond DMZ and inside doesnt know ...
1
vote
4answers
14k views

Netcat IP Spoofing

I am connecting to a server nc -v 192.168.0.1 1111 But I want to do IP spoofing because the server on 192.168.0.1 only accepting commands from 7.7.7.7. We are two friends, I am 192.168.1.1, and my ...
3
votes
1answer
972 views

Is SSL session based only? Is there a (formal) definition of an SSL connection?

In various docs on SSL there is a mention of connection. But from the context I am not sure if this means the underlying TCP connection or the SSL connection. I am thinking that there is no SSL ...
2
votes
1answer
450 views

secret key compromise in SSL vs in Kerberos

Consider the consequences of compromise of a secret key in the Kerberos system vs. in SSL. For example, suppose your individual shared secret key (for your user account) becomes compromised (i.e. it ...
10
votes
2answers
6k views

What is the use of cross signing certificates in X.509?

In X.509 architecture what are the uses of cross signing certificates from other hierarchy? Does it just expand trust? So from the answer I am assuming that if CA3 is cross signed by CA2 (from ...
4
votes
1answer
822 views

VPS Safety in the Cloud

Imagine you are running a web server on a Virtual Private Server (VPS) hosted in a datacenter. Could the people running the datacenter covertly read files from my VPS's hard disk? Could an attacker ...
11
votes
6answers
2k views

weird visitors to my website

For the last three months I have thousands of real visitors to a single page on my website. Those visits are recorded in Google Analytics and count as page views in adsense reports, but they are fake: ...
0
votes
1answer
232 views

Authentication methods without trusting 3rd parties unless explicitly indicated

The plan is to have a situation in which no third parties have to be trusted unless you explicitly indicate so. For example CA's are only used when the contact explicitly added the CA as a trusted ...
1
vote
2answers
206 views

Metasploit Development Reference

The Metasploit team provides some documentation on how to develop exploits, but other than looking through the sourcecode (which is annoying considering how much time I spend going from this file to ...
0
votes
1answer
106 views

NetRange and Router Sharing for Pentesting

When pentesting a network, call it ExampleNet, the network range sometimes exceeds 256 hosts, such as the range x.y.56.0-x.y.63.255. Does this mean that a compromised host on x.y.56.z could be used to ...
25
votes
4answers
4k views

Why is using salt more secure?

Storing the hash of users' passwords, e.g. in a database, is insecure since human passwords are vulnerable to dictionary attacks. Everyone suggests that this is mitigated via the use of salts, but the ...
0
votes
1answer
1k views

URIs in the subjAltName X.509 extension

The subjAltTag extension for X.509 certificates can take in domain names, email addresses, URIs, etc. I was playing around with an X.509 whose subjAltTag had just a URI in it doesn't seem to work. ...
2
votes
3answers
3k views

Why different key exhange techniques for ssl key exchange?

During ssl key exchange, I have read that sending the symmetric key to the server encrypted with the server's public key is an old technique. Now for key echange Diffie hellman and other techniques ...
1
vote
1answer
387 views

What are the requirements for a random number generator to a be safe to use in cryptography?

When I look at most RNG's (random number generators), I see a disclaimer that looks similar to this: Caution: Mersenne Twister is basically for Monte-Carlo simulations - it is not ...
0
votes
1answer
505 views

Sending Commands using Hping3

I want to send my command to destination server. I am using hping3. And; hping3 -p 9999(running daemon and commands executing on this server) -S 127.0.0.1 I want to send my command. How to?
-1
votes
2answers
714 views

The best papers on WPA/WPA2

I have to write a term project about WPA/WPA2: I should find and read five articles and write a sort of summary of the technology citing those articles. And no, the professor will not help find ...
14
votes
4answers
3k views

environment variable accessibility in Linux

Perhaps this is a trivial question, but how accessible are environment variables in Linux between different users? e.g. if Alice executes export FAVORITE_FOOD=`cat /home/alice/fav_food.txt` Can ...
2
votes
1answer
4k views

Convert RSA public key to the right format

I need to send a public key to my bank. I'm using CoreFTP which allows the generation of keys using RSA. It says that it generates "OpenSSH compatible certificates [sic]" when you press the generate ...
12
votes
4answers
1k views

Encrypting IP addresses in a MySQL database

I'd like to encrypt IP addresses in my MySQL database, with the following constraints: Does not need to be resistant to attackers that can execute queries. Must be resistant to attackers that have ...
1
vote
0answers
197 views

Hidden Registry Strings - possible rootkit? [closed]

Win server 2003 R2 SP2 - no noticeable issues on the machine. When I create new strings in regedit, I hit refresh and they are gone! I try to re-add and it complains the string already exists. I am ...
2
votes
2answers
12k views

Best Approach for removing XSS Vulnerability

I have been developing a Webobjects application, and I found that my application is vulnerable to XSS through URL, but not when malicious input like <script>alert("hi")</script> is input ...
4
votes
6answers
2k views

Password sent via email upon registration

I was wondering what the pros and cons are about sending an email with the password to a user registering on a website (like wordpress.org does). They use pretty good passwords (12 characters long ...
1
vote
1answer
124 views

Viable way to authenticate certificate without a web of trust?

For SSL certificates we have a web-of-trust principle. If we are allowed to make alterations to the certificate format, are there viable ways to automatically or semi-automatically authenticate the ...
4
votes
3answers
2k views

Does DNS pinning protect against all DNS rebinding attack?

I found an example of a DNS rebinding attack scenario in the paper "Dynamic Pharming Attacks and Locked Same-origin Policies for Web Browsers". Figure 1: An example of a dynamic pharming attack ...
1
vote
2answers
604 views

If I migrate from dovecot/imaps to exchange will I be less secure?

I have a client using Terminal Server and it would make some sense to use Exchange for email as well, rather than the current situation with postfix/dovecot running on a linux VM alongside - ...
8
votes
2answers
3k views

PCI Compliant Key Management solutions that don't cost a fortune

We are relatively small software company who has a requirement to store PAN's for our customers. Hosted payment solutions just don't fit our product requirements. We literally have 3 lines of ...
0
votes
2answers
798 views

SSL/TLS Protocol Description

It may seem crazy to you, but I wasn't able to find any detailed description of these security protocols on the web (except wikipedia). Can you point me out some documentation of the protocols ...
0
votes
1answer
2k views

Deep packet inspection of VOIP packets

Some telecommunication companies in Europe and maybe in other parts of the world now want to charge their customers for the VOIP traffic (maybe some already are doing it), e.g. the use of Viber, Skype ...

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