2
votes
1answer
6k views

Is 4096 bit good enough to encrypt data?

I need to store encrypted information in a mysql table. I would like to use the AES algoritm but I don't know if 4096 is supported and if it is a good length to encrypt data like: credit card, email ...
13
votes
3answers
269 views

What is a reasonable approach for deidentifying data?

I have been asked by a client to deidentify the PHI data in their database and I'm either over-simplifying the process or my client is overly paranoid. Perhaps you can tell me which is the case. ...
4
votes
4answers
3k views

Is it correct to use form field(hidden) for storing Session Token

Is it correct to use form field(hidden) for storing Session Token instead of using Cookies? What is the security risk associated with it?
2
votes
1answer
721 views

How can credit cards be encrypted and still be recalled later?

Many merchants offer to save credit card info in an encrypted form for faster checkouts from their store in the future. How is it that merchants can store this information in an encrypted format and ...
3
votes
1answer
1k views

Purpose of certificates signed and trusted by CA

Another newbie question but I just don't get the purpose of certificates signed and trusted by CA. We already have public/private keys, hash functions to sign/encrypt messages so why do we need ...
2
votes
3answers
2k views

HTTPS Apache2 Information Leakage

Hello IT Security! I have Apache2 vhost with HTTPS listening on port 443, ie. https:// securesecret.com. I have another vhosts with HTTP listening on port 80, ie. http:// one.com, http:// two.com. ...
2
votes
4answers
1k views

Best way to push data to a client without being blocked by firewall

I'm asking this question here since I think people on this forum probably have the best knowledge of firewalls and routers. Say I'm designing a multi-player game and I want to push data to the client ...
5
votes
3answers
341 views

How do I defend against known php hacks

I have IPs attempting to probe our web server trying to find open URLs. The two known methods are attempting to find specific nodes on our drupal site, or attempting the ../../../../ trick to try and ...
10
votes
4answers
364 views

Should a web application return true http errors?

Exception and error information can be used by a malicious user to map out the API of an web application, so it is routine to see security checklists to advise returning only a "Please contact your ...
1
vote
1answer
1k views

Can you describe a real-life scenario of exploiting sticky bits?

Sticky bit are mentioned in every UNIX security book, but I couldn't find anyone that describes the exploitation of Sticky Bit set on a file. Can you?
4
votes
2answers
2k views

Incrementing Initialization vector by 1

Suppose that we do not generate initialization vectors randomly (using AES in CBC mode). Instead it is initially all zeroes and we increment it by 1 each time a message is encrypted. How can this ...
6
votes
3answers
629 views

Is the Kaminsky bug still a problem for sites without DNSSEC?

I have read about the Kaminsky bug, but I don't fully understand how easy it is to use this vulnerability for an attacker. Are DNS-software updated now so it's not that easy to use this vulnerability ...
1
vote
2answers
3k views

Best efficient windows hardening audit script [closed]

Do anyone know of a script that uses no 3rd party executables (preferably a batch file) that can be used to audit windows machine state securitywise? (including best practices features - gpo, ...
3
votes
3answers
2k views

how an iframe can cause xsrf?

I know how a form tag is prone to CSRF which does not use any token (or any other challenge-response mechanism) but I was wondering how an iFrame can be used to cause XSRF attack and what would be the ...
0
votes
3answers
529 views

DOM XSS : Need Help

I was trying my hands at DOM based XSS. I came across a scenario where user controlled string from the URL is included in javascript as below var userControlled=substring of URL; ...
2
votes
2answers
231 views

Securing iPads and laptops in an enterprise

We have users in our organization who own iPads and we'd like to connect them to the network; however, if the users download and store sensitive data on the devices, that can pose a security issue. Is ...
7
votes
2answers
1k views

Best practices for email security

I writing a security layer for my app and I would like your input on updating users' email addresses (also used for the login). I'm interested to hear from anyone who has written an application with ...
3
votes
2answers
177 views

How do shared hosts protect different sites?

I host all my websites from a single VPN, and am about to sell some limited space of my Linode to a friend to host their new blog. It'll simply be another entry in Apache, and then a dedicated folder ...
0
votes
3answers
2k views

Number of AES-256 operations per second on a maximized Cray XE6

How many FLOPs does one AES-256 operation take in ECB mode? How many AES-256 operations in ECB mode can a maximized Cray XE6 perform per second? Cray states that it can be scaled to over 1 million ...
1
vote
1answer
1k views

Can Solaris' shadow hashes be created by better algorithms than the default DES-based hash?

By default, Solaris uses Traditional DES to encrypt password hashes in the shadow file. Is there a way to harden the security by changing this default behaviour and make it to be hashed using a ...
3
votes
4answers
239 views

what is the use of stolen personal details?

What can hackers do with personal information that includes this: First name, last name, snail mail address, mobile phone number and email address?
6
votes
2answers
2k views

What algorithms are best be cracked by GPU?

What algorithms are best being attacked by a GPU powered password cracker? For example, I heard that md5crypt that is being used in unix shadow file, is not the best choice for GPU cracking because it ...
6
votes
3answers
2k views

Is it possible to infer that a hidden truecrypt partition is likely to be present

Truecrypt contains a feature that let's you create a hidden volume. It's said that it can't be proven if a hidden volume exists. However, is it possible to infer from the state of the data on the ...
6
votes
2answers
839 views

Two certificates on smart card

I have a question regarding Swedish gov eID (but I guess it is a pki/smart card general question); Why is there two certificates/keys on the card? Background: In Sweden you can have a "citizen ...
4
votes
2answers
214 views

Salting a public hash

Does it make any sense at all to salt a hash which might be available publicly? It doesn't really make sense to me, but does anyone actually do that? UPDATE - Some more info: An acquaintance of ...
22
votes
4answers
29k views

What is the use of stolen credit card details?

What can a person with stolen credit card details do? Buy porn? Buy tons of server resources to perform an attack? What else? I'm sure that if he buys books, shoes and bicycles or transfer funds ...
2
votes
1answer
3k views

Detected Port Scanning Attack in ESET Smart Security

I receive a number of notifications from ESET Smart Security about Port Scanning attack. But I'm behind a router. But as far as I know, computers behind a router is not accessible from others (Please ...
1
vote
2answers
836 views

How to react on a message about a pending account ban on Facebook? [closed]

Are you getting this message on chat? LAST WARNING : Your account is reported to have violated the policies that are considered annoying or insulting Facebook users. Until we system will disable ...
3
votes
1answer
3k views

Is opening both TCP/UDP less secured than just TCP or UDP when needed and why?

If application needs opened port X UDP, or X TCP combination. Is there any potential risk by opening both UDP/TCP as I usually am not sure which one the application uses?
9
votes
2answers
130 views

Encouraging security researchers to disclose vulnerabilities

What are approaches to forming solid relationships with security researchers? For example, is publishing a public PGP key on the "contact us" page of a company's website for high levels of risk ...
6
votes
2answers
565 views

International pentester certification

I've looked at the questions regarding certifications on this site and they are essentially asking what to go for. I hope that my question is distinct enough that is is not considered a dupe. I ...
30
votes
4answers
10k views

Can web sites detect whether you are using private browsing mode?

Most modern browsers support "private browsing mode" (also known in Chrome as "Incognito mode"), where the browser does not save any information to disk about your browsing while in this mode. In ...
4
votes
0answers
1k views

How can you remove your presence from the Internet? [duplicate]

How can you remove your presence from the Internet? For example from social networks, from email servers, from forums etc. Problem is how records of you are identified on the internet? We have well ...
10
votes
1answer
1k views

Closing an HTML element without using literal slashes?

I'm investigating a vulnerability in an application that echoes a user-supplied filename without sanitizing the filename. E.g. a file named test-<script>alert("evil");.txt will result in that ...
3
votes
2answers
133 views

When using a recovery disk, like AVGs boot-able CD, to scan for viruses, malware etc… what are the limitations?

What I like about about the boot-able CD concept, is it can connect to the Internet and get updates, however I'm not clear how effective they are at really finding things that are heuristic? How do ...
4
votes
3answers
952 views

Does Hash/Salted password really help when DB is compromised?

I came across this article and got a basic understanding hash, salt and brute force attack. My question is in the article, the author emphasises how hard it is to reverse the hash/salted password to ...
26
votes
4answers
14k views

Does a Virtual Machine stop malware from doing harm?

I would like to know if it is save for the host system of a virtual machine (VM - VirtualBox OSE in my case) to execute malware. Can a virus break out and read or write data from the host system? ...
3
votes
2answers
2k views

What is more secure: ISDN, Cable Modem, DSL, T1, etc…?

This discussion came after showing a friend this Security.SE post regarding DNS attacks, and after reading about a Cable Modem MITM attack. Given the current options available to consumers, what ...
3
votes
2answers
464 views

Secure Software Development

I'm researching models on building security into the SDLC and so far have come across: BSIMM Microsoft SDL Open SAMM Are there any other documents and resources to look into? Specific tools that ...
6
votes
2answers
316 views

Ethics and economy in security research

How can we design a market for information disclosure where individual security researchers may benefit economically in an ethical way? Assume a market where the participants are governments, ...
1
vote
2answers
701 views

Strange Event Log Entry - Windows Server 2008

Reviewing some logs recently, and came across a strange failure in our Windows 2008 DC. An account failed to log on. Subject: Security ID: NULL SID Account Name: ...
3
votes
3answers
2k views

Any place where I can find some template or base documents for IT/Infosec Compliance?

We're facing an audit and we are sorely lacking in documentation regarding information security policies. I've done some Googling and have been surprised by the difficulty of finding a good "template" ...
7
votes
1answer
469 views

OpenPGP Encryption / Decryption Process Using GnuPG

I want to know if my method of encryption can ensure the security of my data if my database was hacked as well as the authenticity of the data I am decrypting. I am using GnuPG's implementation of the ...
6
votes
3answers
821 views

Global check of input/output of known hash functions

Is there a website, application, or script that will allow you to give an input/output for a hash function, run these against known functions, and return any matches? Here's one attempt to list the ...
5
votes
4answers
1k views

Server wide javascript injection

UPDATE: The server was rooted, php.ini was replaced that cause the injection to appear. Still haven't figured out which directive is injecting the javascript. I'm troubleshooting a hacked website ...
2
votes
2answers
2k views

Secure SSL Session from losing itself into unsecure http

I've seen some implementations of HTTPS SSL and, as a visitor, forced to rely to a lot of those. What would a secure implementation look like and where can one expect problems? I expect the installer ...
2
votes
3answers
168 views

Identifying and preventing execution of “any” function via Late-Bound commands

The Command Pattern is widely used to create a robust, salable applications. However I see guidance in this MSDN article that could allow a caller to invoke a late-bound command... enabling the ...
9
votes
3answers
2k views

How to recover securely deleted data

Since we all know files are recoverable with programs after being deleted from the recycling bin, everyone is told to do secure wipes by putting random data over the files you're deleting on the disk ...
36
votes
6answers
20k views

Trying to make a Django-based site use HTTPS-only, not sure if it's secure?

The EFF recommends using HTTPS everywhere on your site, and I'm sure this site would agree. When I asked a question about using Django to implement HTTPS on my login page, that was certainly the ...
7
votes
7answers
4k views

GPU powered Password cracking machine - buy metal or cloud?

As a IS consulting firm, we would like to have our very own password cracking machine. Great. Now, after some sketching and brain storming we concluded that GPU is the best way to go (contrary to CPU ...

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