6
votes
2answers
7k views

The new CCMP attack against WPA/WPA2 PSK

The use of Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP) for WPA/WPA2 PSK is being attacked. This is a trivial attack (offline brute force) against the initial ...
8
votes
3answers
1k views

time to crack file-encryption password - more than just iteration

I have often seen that takes x amount of time to crack a certain length password. But this just seems to be the amount of time it takes to iterate through all the possibilities. What about the time it ...
5
votes
3answers
741 views

Phishing virus found on server

I recently had a call from BELL concerning a virus on our Linux ( Debian ) Server. Apparently Google emailed our client about an Italian Database found on our server that was doing phishing. They ...
5
votes
3answers
1k views

vt-d Virtualisation and Trusted Execution Technology

Being a long time VirtualBox user and having recently purchased a new laptop equipped with an intel i7 720QM I discovered that it supported vt-d. In the meantime I've found out that vt-d comes with ...
3
votes
1answer
327 views

OpenBSD-based LiveCD/LiveDVD - is it secure? is it offical?

Does the OpenBSD LiveCD/LiveDVD get deeply audited like the original OpenBSD? Is it an official "port"? Experiences with it?
4
votes
2answers
5k views

Diffie Hellman c# implementation

Hallo all, For a test project I have tried to implement the (famous) Diffie Hellman algorithm for safe key exchange. Now I have written this in C#: using System; using System.Collections; using ...
3
votes
3answers
121 views

Encrypting a fixed format message with commands and transmitting over the internet

Linked to: Encrypting a fixed format message? I need to communicate from Site A, a set of information that will be presented to users of Site A, which when they choose to submit, should travel to my ...
5
votes
1answer
1k views

TLS at layer 4 BUT 802.1X EAP-TLS at layer 2?

In the CISSP books, SSL/TLS has been through the arguments and fell rest onto the transport layer 2 instead of the session. OK - Fine. Port security 802.1X and EAP is a data link layer 2 ...
8
votes
3answers
3k views

Is CentOS a good choice from a security perspective?

How secure is the CentOS Linux distribution? I noticed there were times when there were no up-to-date patches for some version of CentOS (e.g., 5.6). I read this on some mailing list that I can't ...
8
votes
1answer
417 views

How can I secure my log files?

I have a cool tool that displays my syslog and kernellog on my mac's desktop. This has me concerned about what is written in them - I'm staring to feel like they are creating a hole in my privacy. I ...
4
votes
3answers
439 views

It is safe to buy a domain if I get this message in Firefox?

Greetings, I want to buy a domain name from a big registar(well known on the internet) but when I go to checkout I see that my link is going from full encrypted to “Connection Partially Encrypted” ...
2
votes
1answer
283 views

How to tell if Firefox Home (iOS) is using Data Protection API?

The source code is here: http://mxr.mozilla.org/services-central/source/fx-home/ What should I be looking/search for? Or even how to extract /ffhomeDB.sq3 and see what it contains.
3
votes
2answers
371 views

loadbalancer, 2 webserver, 1 webserver hacked , how to tunnel out?

Lets say I have one load balancer (HAProxy) and two web servers one gets hacked. Is the attacker able to make outgoing connections when the web servers have no direct internet access (only ubuntu ...
20
votes
3answers
4k views

Password manager vs remembering passwords

I have always thought that you are not supposed to use a password manager but to keep your passwords in your head, but lately I have thought about the pros and cons of having a password manager. Some ...
8
votes
2answers
426 views

Is there a way to negotiate a secret between 2 parties with no prior knowledge?

Is there a way for 2 parties to negotiate a shared secret (for example, a session key) without having a pre-shared knowledge? SSL does this by using asymmetric encryption. Is there any other way to ...
6
votes
5answers
987 views

Firewall demo - iptables

I have to make a demonstration about firewalls in my class as a student(university). It should be implemented using iptables on Linux. I am reading all the theories around them but I can't figure out ...
4
votes
3answers
182 views

(custom software) Security rules on each record when using user-groups per application

I'm working with custom software here, so don't worry about Microsoft whatever, Open anything, or something else. Let’s stick to theory of how this should go together. Let’s say I have a user ...
2
votes
2answers
215 views

Is random data inserted into an encrypted stream easy to retrieve?

Given that I have two pieces of data: A large piece of encrypted data. A small, fixed-size piece of random data. I want to be able to transmit both pieces of data together, but I don't want the ...
22
votes
4answers
11k views

how long does it take to actually generate rainbow tables?

I've been reading up about rainbow tables as I think they're quite interesting cause they're actually a pretty simple concept. Anyway, I was wondering, has anyone been involved in actually generating ...
6
votes
2answers
3k views

Wireless hardware with limited range?

I have never used wireless networking at home, but am considering it. Does anyone make wireless hardware designed for single-room connectivity? Several sources have recommended WPA2, but I'd still ...
14
votes
2answers
16k views

How is OpenSSL related to OpenSSH?

Is OpenSSH using OpenSSL to encrypt traffic? Or something else?
7
votes
2answers
3k views

What is the “openssh-blacklist” package? Is it related to the Debian OpenSSL bug?

What is the "openssh-blacklist" package? Is it related to the Debians OpenSSL bug?
3
votes
4answers
2k views

Problems during Pen-testing of SCADA systems

Is there a way to monitor the way the SCADA systems behave 'during pen-testing or security audit', and find out the implications of just port scans and/or monitor the state of activity while sending a ...
8
votes
2answers
240 views

How do you address a social engineering and or software weakness/concern in a company or organisation?

Say that you call your bank and are able to start talking about your personal finances, without having given them any real proof of your identity. Well the first thing I'd think would be to change ...
4
votes
2answers
2k views

Cisco IOS question - password management, service password encryption types

I'm university student studying for my certification exam, and I was doing some reviewing today when I found a question that I can't find an answer to. Basically, in the CCNA3 2.4.1 Cisco Netacademy ...
2
votes
1answer
338 views

IP Conflicts / Spoofing

Are there any products / os that behave differently when an duplicate IP address is detected. This may indicate an IP spoof ? Can TCP stack 'shutdown' or stop in order to protect itself ?
11
votes
4answers
2k views

Is it feasible to encrypt customers personal data? (name, address etc…)

Seeing the Sony Personal data kerfuffle unfold has gotten me thinking about the encryption and securing of personal data - obviously credit cards can (and should) be encrypted, making data breaches of ...
11
votes
3answers
234 views

Different MySQL Users Security Benefits

Anyone with a brain cell knows that using a user that isn't root/dbo/etc adds a lot to security and how effective SQL injection attacks can be. I'm wondering if taking that idea a step further is a ...
8
votes
2answers
849 views

Stretching a hash, many iterations versus longer input string

I have been reading up on various password hashing schemes, for example the SHA-based Crypt proposed by Ulrich Drepper and used in some Linux versions. A recurring theme here is to 'strengthen' or ...
2
votes
1answer
566 views

IPV6 Cryptographically Generated Address implementation

I am looking to an Cryptographically Generated Address (CGA) implementation in Java or in C++. Would be glad if someone can help.
3
votes
7answers
591 views

Biometric authentication in the real world

can anyone give a realistic estimation, based on real-world experience, of how much biometric authentication techniques are being used in the IT field?
7
votes
2answers
2k views

Is strong cryptography legal across the internet?

In many countries strong cryptography is outlawed. That means you must store the data of your users in such a way, that government of that country can always decrypt it. And if you don't, you are a ...
3
votes
3answers
281 views

How do you make sure a pdf is deleted after being viewed in the browser?

For things like images or html documents, cache headers make sure that the data is deleted when the browser is closed. However as PDFs are opened in a plugin, the cache headers do not seem to have the ...
11
votes
4answers
910 views

“Phishing” red flags and countermeasures

Given the recent spate of intrusions into various networks which have included compromise of subscriber identity and contact information, I figured it would be good for us to have a thread on how to ...
10
votes
8answers
646 views

iPhone Tracking debacle - risks and countermeasures

For those of you who are not familiar with the topic, a quick search will turn up a lot of hits, e.g. see the researcher's report at Got an iPhone or 3G iPad? Apple is recording your moves - O'Reilly ...
8
votes
6answers
2k views

How to securely store my passwords?

Regarding this: Are passwords in memory? So does someone have a good idea on how to securely store my passwords? The: "passwords.txt" -> ctrl+c; ctrl+v a passw is not very secure. I have passwords ...
17
votes
3answers
2k views

Are passwords in memory?

I have an encrypted HDD (dm_crypt). That's why I store my passwords in a simple text file. I usually copy/paste the passwords from it. Ok! Q: If I open this text file then it goes into the memory. So ...
22
votes
4answers
1k views

How do you manage security-related OCD (i.e. paranoia)?

I did a quick google before asking this, and came up with the following article, linked to from Schneier's blog back in 2005. It doesn't really answer my question though. As society has crossed into ...
4
votes
3answers
380 views

How can IT audit for installation of IIS Express?

IIS Express is a developer tool for Windows XP and higher which provides the full feature set of IIS, but without needing administrator rights. I've seen discussion by some developers who are ...
9
votes
4answers
574 views

Should I obfuscate passwords before hashing? Should I pre-hash them on the client? What about salts?

For fun, and in my spare time I'm creating a simple CMS for my own purposes (with hopes to release for wider use... later), using PHP. I'm currently working on the login scheme now, and have a few ...
6
votes
10answers
1k views

Surfing anynomously

For work I often go to China, and there I met some dissidents I would like to help. I need to upload some videos to an ftp server in Europe. I will connect through a public hotspot without ...
5
votes
4answers
482 views

Possibility of undetectable encryption system

I am not sure if it is pre-mature to ask such a question. The question is largely inspired by pondering over the question and discussions in the following link (In his answer, @Dad also raises ...
6
votes
1answer
2k views

Feistel Block Cipher

Can anybody explain, in simple terms, how Feistal Block Ciphers work. I am not a math student so I do not understand the math behind it, just would like the principles.
15
votes
1answer
3k views

REST specific security weaknesses

I need to start working with RESTfull Web Services. SOAP based web services have already so many standards to secure communication, establish trust etc. I am not aware of any for REST. What I would ...
5
votes
5answers
600 views

Why re-verify with CAPTCHA on failed form entry?

Is there a reason for sites to ask for another CAPTCHA verification when some other part of the registration form, e.g. the username, was invalid?
3
votes
2answers
182 views

Encrypting a fixed format message?

I'm planning to send across TWO pieces of information over the internet from machine A A site identifier which will be like: $SiteName = "EXAMPLE" (in plaintext) Encoded text which will be like: ...
6
votes
3answers
287 views

Can you provide loss values on security breaches?

When someone says "why do we need to spend so much money and effort on security, we need to focus on market share first and once someone finds a problem we will fix it", I would like to have a list ...
13
votes
2answers
4k views

Reject IP packets with an ICMP error, or just drop them?

Consider an internet-facing host (the outer firewall). What should be done with undesired traffic: just drop it, or send back an ICMP error such as port unreachable? (In Linux terms: iptables -P DROP ...
5
votes
1answer
531 views

Reasons behind MAC Spoofing on a corporate network?

My team is inspecting some MAC Spoofing events that are triggering in our corporate environment. After talking it over with the team, this is the information that we have that is relevant.... The ...
80
votes
6answers
26k views

Password Hashing add salt + pepper or is salt enough?

Please Note: I'm aware that the proper method for secure password storage hashing is either scrypt or bcrypt. This question isn't for implementation in actual software, it's for my own understanding. ...

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