29
votes
3answers
10k views

What is a good general purpose GnuPG key setup?

Since most key types can be used for multiple purposes, namely certification, authentication, encryption and signatures, one could simply use one key for everything - which is a bad idea, as ...
12
votes
5answers
11k views

Why is Tor safer than a proxy?

If I use a Tor router to browse the regular internet, my traffic must leave the Tor network through an exit node. Apparently the exit node can see the data originally sent. Is this true? If an ...
1
vote
2answers
762 views

What is the safest way to store a password in a single file?

I've been reading about it. This article helped me a lot. But the more I read the more complicated it seems. For example: Is it better to use bcrypt, or PBKDF2, sha2 or something else for the salt? ...
5
votes
3answers
2k views

Why would you want to run DNS servers externally?

Something that's never made much sense to me is when environments have DNS servers which are publicly accessible (on the internet). This more often than not seems to leave them vulnerable to Cache ...
0
votes
1answer
2k views

DNS Cache Poisoning and Snooping

I'm trying to do two things here. The first is poison the cache of a target DNS server. A scan has suggested the network I'm attacking is vulnerable to CVE-1999-0024. My understanding of this ...
3
votes
1answer
614 views

Internal CA for Digital Signature Solution - PKI Based

I'm trying to set up a digital signature solution which would work with a internal PKI. We have considered Microsoft Certificate Services, but we don't want to rule out any other option to set up a ...
2
votes
2answers
410 views

Is every client-side language more vulnerable?

With web browser plug-ins like Firebug, it is easy to manipulate the source code of client-side language such as HTML and JS. Then are those languages more vulnerable than server-side ones ? When one ...
-3
votes
1answer
512 views

When logging into a web page what exactly happens when a user types the wrong password?

I have two related questions as to what happens when a user tries to log in to a website If the entered password is wrong what should happen? I have two ideas: Redirect to a page saying "wrong ...
1
vote
1answer
492 views

How effective is Activesync Certificate revocation using CRL or OCSP

We determined that a number of our account lockout issues are related to Activesync devices using old/expired passwords. One way to remedy an account lockout issue is to issue and deploy certificates ...
9
votes
3answers
44k views

What does working in cybersecurity look like?

I am thinking of working in cybersecurity since a while now (I am doing a bachelor degree in computer science and I have one in mathematics). However, I don't know what it really looks like. And ...
4
votes
1answer
256 views

Potential issues with Kim Dotcom's new proposed “encrypted webmail service”

Just spotted a Reddit thread about Kim Dotcom, of MegaUpload fame, planning to produce a secure webmail system that allows people to communicate securely, without the worry of having their messages ...
1
vote
2answers
2k views

How do I find a target on the wired network, from an attack system on Wi-Fi?

I'm trying to practice penetration testing on my home network. The target system is my desktop computer, which is connected to the network via ethernet cable. The attack system is my laptop, which is ...
3
votes
1answer
2k views

Key length and hash function in PBKDF2

On this page: http://www.ruby-doc.org/stdlib-2.0/libdoc/openssl/rdoc/OpenSSL/PKCS5.html they make a statement that strikes me as rather weird: Key Length Specifies the length in bytes of ...
7
votes
1answer
8k views

How can XML Injection be exploited , need example?

So I found this explanation for a vulnerability on some cms : The XML parser at /WorkArea/Blogs/xmlrpc.aspx is vulnerable to XML external entity attacks which can be used to Scan behind ...
1
vote
0answers
210 views

Which are appropiate tests to perform during an internal/LAN security audit? [closed]

In the internal network we know that controls are less strict than externally but in the other hand we know that lots of attacks come from the internal segment (unhappy workers, etc.) Which are ...
4
votes
1answer
1k views

Securing a simple webservice against brute-force with mod-security

I want to provide basic defense against brute-force attacks against a simple HTTPS web service. The web service provides a login method (let's say at http://example.org/login) which gets passed a ...
0
votes
1answer
1k views

Penetration testing job entry exam [closed]

What type of hands on tests should I expect in a interview for a entry level penetration tester? And what do examiners expect a candidate to accomplish (i.e. full compromise)? The reason I ask is ...
16
votes
3answers
2k views

What security risks does Firefox 19's built-in PDF reader (pdf.js) bring?

Firefox 19 ships with pdf.js as the default PDF reader. One of the main stated goals is to reduce the exposure of users to the often vulnerable Adobe PDF reader/plugin. So what new risks does pdf.js ...
15
votes
4answers
2k views

What measures should be taken when losing an iPad

When losing a tablet that has been used to access email accounts , beside changing the passwords, is there anything more can be done? What are the most common problems that might occur if the iPad ...
5
votes
1answer
446 views

Need to ephemerally store third-party password

One particular web service that I am writing interfaces with an API. Each API call requires the user's username and password to be sent, no state is maintained. Ideally, when using my web service the ...
2
votes
1answer
9k views

MAC spoof not working?

I have set up our home router to only allow certain MAC addresses to connect. One way to test if the filter is working is to spoof a MAC address not in the list and trying to connect to the router. So ...
3
votes
4answers
4k views

How can an internet contest verify unique votes with only an email as an input parameter?

For my computer security course we are brainstorming different ways to use attributes for a unique user (that are readily available over a network) to prevent various mischievous activities. We've ...
0
votes
1answer
219 views

Facebook data visibility to admin staff

I recently had a conversation with a friend in which I told him that everything written on Facebook can be seen by the Facebook admin staff. As a software engineer and database administrator I know ...
3
votes
2answers
269 views

When cellphone providers give “unlimited social networking”, how do they identify the traffic?

Some providers will give unlimited traffic for things like Facebook, Twitter, LinkedIn and even YouTube in some rare cases on smartphones. I'm wondering if there's any documented way they identify ...
6
votes
5answers
52k views

Cracking CISCO ASA Passwords

I've got a copy of a Cisco ASA config and i want to crack the following example passwords I've got the following lines in the config ASA Version 8.4(2) ! hostname ciscoasa enable ...
3
votes
4answers
861 views

Is it safe to have the salt equal to IV?

If I'm using AES-256 CBC to encrypt, getting the 32 byte key using multiple iterations of the PBKDF2 function with a 16 byte salt, is it safe for me to let IV be equal to the salt? (Edit: The salt is ...
3
votes
1answer
624 views

Why should an IKE responder change the cookie secret 'frequently'?

IKEv2 has the concept of a COOKIE mode, to attempt to prevent state exhaustion from floods of initiation requests from non-existent IP addresses: Two expected attacks against IKE are state and CPU ...
6
votes
2answers
3k views

When, exactly, should old password reset tokens be deleted?

I'm trying to figure out best practices for working with password reset tokens. Say a user initiates the password reset process and the are emailed the reset token and we store a hashed copy in the ...
-2
votes
1answer
828 views

How to test a proxy for tcp and udp traffic? [closed]

Is there a simple way to test a proxy to determine if it is correctly forwarding TCP and UDP traffic? An ideal method would be script-able.
1
vote
1answer
616 views

I think I downloaded spyware from an ad on tortoise-svn site

The other day in a rush to quickly download and install tortoise svn, I accidentally clicked on a big download button on an ad on their site and installed something that I don't see on my computer. ...
1
vote
2answers
2k views

What justification is there for Comcast to block SMTP port 25 outbound from residential service?

Within the last week, Comcast seems to have started blocking port 25 outbound from their residential internet service. I can sort of understand why they might justify blocking it inbound as perhaps ...
5
votes
2answers
4k views

File security when encrypting files directly with the openssl command / and what about SHA1 hashing password first?

I've been using this command to encrypt files for a while now: openssl aes-256-cbc -a -salt -in secrets.txt -out secrets.txt.enc Then I type in a password. Can someone tell me, roughly speaking, ...
8
votes
5answers
428 views

Threat model for huge warnings on untrusted SSL certificates and no warnings for plain HTTP connections? [duplicate]

Why do untrusted/expired SSL certificates get such a huge warning in modern browsers even with "DO NOT VISIT THIS SITE!" messages, whereas a regular HTTP connection, which is more prone to ...
4
votes
1answer
7k views

Enhanced Key Usage vs. Extended Key Usage

I've seen both the terms Enhanced Key Usage and Extended Key Usage, and both were abbreviated as EKU. Do both refer to the same extension or property?
1
vote
1answer
1k views

OpenVPN through company proxy and surfing history

Been trying to find an answer to no avail. Probably I just don't understand the terminology... So if anyone may shed some light in plain English, that would be awesome. I connect to a paid VPN ...
1
vote
2answers
532 views

How to check whether the cookie is set securely

I found solution for setting asp.net_sessionid cookie as secure. The solution is to make changes in web.config file as given below. <\system.web> I want to know if this change is setting the ...
1
vote
2answers
444 views

What is a better practice - RSA Encryption vs Windows authentication

I have two machines running windows OS with IIS and window OS with MS SQL. In the production web.config file I configure the IIS to use a user name and password when connecting to the DB and then I ...
75
votes
10answers
21k views

Why do we not trust an SSL certificate that expired recently?

Every SSL certificate has an expiration date. Now suppose some site's certificate expired an hour ago or a day ago. All the software by default will either just refuse to connect to the site or issue ...
0
votes
2answers
173 views

How can I encrypt something user provided without risk of the key being exposed?

So, let's say I have a theoretical service. User has some text they want to encrypt. They pass it to me, and I encrypt it. Then, only I should be able to decrypt it afterwards. Another kicker, it must ...
0
votes
1answer
407 views

All I see is RPC, how do I proceed?

I finished a tiered hacking exercise, and after submitting it was told that the last tier (a machine on the network) was not possible to attack in the given exercise. The machine was only running rpc....
3
votes
2answers
765 views

How can I protect my domain names without exposing too much personal information?

I guess more specifically I want to know how to ensure I retain ownership by having sufficient contact information in the Administrative, Technical and Billing contact fields, but without exposing too ...
11
votes
1answer
5k views

Is it secure to transfer an RSA public key by email?

I've set up my VPS'ssh server to accept only key-based identification: I disabled password-based connection. As a consequence I am connecting from home with an RSA key generated prior to password ...
6
votes
4answers
847 views

Source code auditing and fake builds

I am wondering about source code auditing and how hard it would be to fake a build to be audited? Let me explain. Say I would be a dishonest programmer that would wish to put in some backdoor into ...
-5
votes
1answer
267 views

how to trace a hacker [closed]

How to trace a hacker how knows what he is doing.He covered all and what now? I em interested how hackers stay anonymous and don t get caught and what are the techniques used by forensic ...
0
votes
1answer
381 views

Key distribution advice

I have been thinking for days about that problem! The application is based on a student system management. I am implementing database encryption on a column level and The encryption occurs at the ...
2
votes
3answers
1k views

SMTP and SSL/TLS

If I understand correctly, communication between SMTP servers may be encrypted but is not required. Because it is optional, does it really have benefits? When server A connects to server B, both of ...
1
vote
3answers
124 views

How to protect against an attack where a person claims to be in a position of authority?

In an office if a person approaches an employee and claims to be a new IT staff and to give them access to their computer, what can prevent this kind of attack? I've worked a couple tech support jobs ...
-3
votes
1answer
1k views

Clean desk policy/No one giving me clear answer when asking about security procedures [closed]

I got a job working at an IBM lab. Many security procedures I do not see the point of and sometimes find so annoying makes me want to disregard the rules all together. The clean desk policy is in ...
0
votes
1answer
1k views

How to conduct a disguised LSA attack against OSPF?

I want to do disguised LSA attacks on OSPF network and be able to more analyze, so I do not know how it works in practice. This is a penetration test. The attack is described in the address [+]. I ...
1
vote
2answers
108 views

How can I set up signed downloads?

Scenario I have a web server that authenticates and redirects from HTTP to HTTPS. Clients can then view available "downloads" in their account. I want to be able to sign these download links - as in, ...

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