3
votes
4answers
1k views

What are good resources to do hands-on practice on network penetration testing?

Can anyone provide a good list of resources to learn network penetration testing? I am specifically looking for those having hands on exercises (kind of virtual labs/ISOs) which are free. I know ...
1
vote
1answer
936 views

Help to understand secure connections and encryption using both private/public key in RSA?

I just started teaching myself cryptography, I am reading this http://www.garykessler.net/library/crypto.html to understand the basics. I am confused by Sections 3.4 and 5.3. Section 3.4 details how ...
3
votes
2answers
365 views

How can I ensure that an android app was installed on a physical device and not an emulator?

I want to avoid people installing the app on virtual devices. Is there any way to tell this? What is best you could do? Ideally what i want to prevent as a whole is one person or entity creating ...
1
vote
1answer
42 views

What security mechanisms enable a user to change their password under a Kerberos environment?

During client authentication, neither the secret key nor the password is sent to the KDC. If a user changes their password on the client, how is the password updated in the password database in the ...
1
vote
0answers
51 views

Needed: Reference data on the rate of adoption of secure email protocols [closed]

I am working on a security presentation in which I need to show that the incidence of unencrypted email protocols (e.g. POP, IMAP without STARTTLS) over the past 10 years has decreased and the amount ...
1
vote
2answers
740 views

XXE and its impact

I am trying to understand the concept behind XXE (XML External Entity injection). I went through OWASP Guidelines on XXE And since I am new to XML and DTD, I went through the W3Cschools tutorials as ...
0
votes
1answer
106 views

Intrusion Detection and Prevention technologies [closed]

I'm supposed to do a research paper on a recent technology and I thought of doing it on a technology in information security. I found interest on Intrusion detection and prevention systems (IDPS) but ...
2
votes
2answers
3k views

What approach would you choose to defend againt DDoS attacks from Nginx level?

I use Nginx compiled with the Naxsi module to protect against some vulnerabilities (SQL injection and cross-site scripting). Now I need to apply a layer of poor man's DDoS protection at this level. I ...
3
votes
2answers
2k views

IP cameras or webcams and wifi/network security

If I have a: router with stateful packet inspection turned on, plus WPA2 security on the wifi network an IP camera or webcam connected to this Wifi network Is there any way to ensure that: ...
8
votes
4answers
300 views

Best practice for informing a website they've been compromised?

I've received a spam email that claims to be invoicing me for some service in New Jersey, USA with whom I've not had any dealings. The email includes a link to a zip file that is hosted on a greek ...
-1
votes
1answer
5k views

Is my information secure when using Private Tunnel? [duplicate]

I am using Private Tunnel to do some tasks involving sensitive data like logging in to PayPal and online banking. Is my data safe or can it be retrieved by other users of the Private Tunnel service?
1
vote
6answers
710 views

DDOS slow-http attack prevention

I am often getting DDOS attack from multiple IPs with simple HEAD requests. There are around 30 unique IPs creating such attacks. 201.230.167.68 - [05/Jan/2014:00:19:19 +0530] "HEAD / HTTP/1.1" 301 ...
1
vote
1answer
113 views

Can I trust the details given in Resource Monitor?

I'm looking at Resource Monitor in Windows 7 and wondered whether a process could be hiding in plain sight by mimicking another process. For example I've renamed an executable file as chrome.exe and ...
0
votes
1answer
111 views

Using multiple hash-functions along the line [duplicate]

I was wondering what the effect on strength/security is If I would use an aggregate of multiple hash-functions. For instance, I don't want to sent passwords in plain text (although it's over an ...
1
vote
3answers
255 views

Tell and sell a (web app) vulnerability legally

If someone discover an unknown vulnerability for a given online service or website, is there a decent way to sell it directly to the concerned entity.
1
vote
4answers
4k views

Is there any solution for block the HTTPS traffic using URL filtering?

The URL filtering can block the HTTP traffic but not the HTTPS traffic in Internet Explorer. For example, the website http://www.facebook.com is blocked by the URL filtering while the ...
-7
votes
1answer
852 views

Can kali linux be hacked [duplicate]

I'm just curious if new version of backtrack Kali be hacked like back-doored or crack user password like the windows or mac
1
vote
2answers
440 views

Is exploit researching different from penetration testing

I'm confused by some terminology - reverse engineering seems to me to be pretty similar to exploit researching. I mean if you can reverse one program probably you will be able to find a vulnerability, ...
2
votes
3answers
652 views

iptables: plaintext password protection

I'd like to find a way to block or restrict my access to the web-pages where my password is sent as a plaintext on the internet. Let's assume if I have the same password for all web-pages, is it ...
3
votes
1answer
116 views

opening random extensions with notepad

I get files with random extensions sometimes in order to bypass corporate firewalls. Usually I would just ask the other party what it is that I just received. Other times I get curious and open the ...
0
votes
1answer
101 views

Self-changing javascript characters in text editors

On Windows Server 2008-R2, certain javascript files are exhibiting the same behavior. Text can be copied from other files and pasted into new ones. In both NotePad++ and Windows' default notepad, ...
10
votes
4answers
2k views

Location to store an encryption key

I'm building a secure system which stores messages on a server in a Postgresql database. The messages are stored encrypted with PHP's openssl_encrypt() function with the AES-256-CBC method. At the ...
0
votes
1answer
67 views

What security exposure (if any) can result from lots of apparently odd referrers in server log

I see relatively many referrers such as the following (as reported by Webalizer) in a web server log. The server is located outside Russia and it's a small one. 8 3 http://tiandeural.ru/ 19 ...
1
vote
2answers
119 views

Enforce a time limit on the number of uploads per user

I've done a lot of searching on SE and particularly here in regards to preventing issues or attacks for an image based website to accept image uploads, but I haven't seen anyone mention the idea of ...
-1
votes
2answers
128 views

I don't understand how BIPS got hacked [closed]

http://www.networkworld.com/news/2013/112513-bitcoin-robbery-276352.html In this story we can see BIPS got hacked, but I don't get how it was hacked when it was offline because of the DDoS.
2
votes
1answer
155 views

After having confirmed a computer is infected by a Botnet.

And having found a server IP that is controlling it. How can I find out the log-in credentials this client uses to log in to a IRC channel / server webpage / control panel. I have found out a python ...
0
votes
1answer
84 views

Proof of quantum safety of the Merkle signature scheme

The Wikipedia article about the Merkle signature scheme claims that it is very adjustable and resistant against quantum computing. What proof is there of this?
2
votes
3answers
170 views

Should we encrypt in-app user messaging?

We have an app running where among other things people can send messages to each other. Obviously admins and content managers that have access to CMS can see what people are sending to each other. Is ...
50
votes
4answers
5k views

What kinds of encryption are _not_ breakable via Quantum Computers?

There's the recent article NSA seeks to build quantum computer that could crack most types of encryption. Now I'm not surprised by the NSA trying anything1, but what slightly baffles me is the word ...
0
votes
1answer
398 views

With a 'man in the middle' attack, can the attacker find out Client/Server session keys with a compromised AS/TGS secret key?

Assuming that an AS/TGS secret key has been compromised by a 'man in the middle' attack who in turn can monitor the network traffic, is an attacker able to find out the Client/Server session keys ...
0
votes
1answer
599 views

Netgear WNDR4000 open port 53

Why is port 53 open on the WAN side of the router? And more importantly how do I close it? Port 53 is not one of my forwarded ports. Discovered by doing nmap -pT:1-64 <my-external-IP> -Pn ...
3
votes
2answers
2k views

Why would you need a salt for AES-CBS when IV is already randomly generated and stored with the encrypted data?

I was looking at this code and came across these comments which says encrypting without a salt is insecure. Why would it be insecure when you are already using a random IV for each value? I think the ...
2
votes
1answer
143 views

Ways to Redirect URLs

I'm looking for some interesting ways to redirect URLs. For example, http://example.com:@example.org will redirect to example.org. Are there any other ways to redirect/spoof URLs in a browser like ...
1
vote
1answer
213 views

Separating Apache and MySQL over Tor for security, performance, and reliability

I'm trying to set up a hidden web service over the Tor network, and I was thinking of making a configuration where my Apache server and my database server are located on different networks. I know ...
2
votes
1answer
139 views

Learning recommendation for Enterprise PKI design and management?

I'd like to learn the top-shelf methods for designing and managing a generic X509 certificate infrastructure. There's some books here and there, but I figured I'd ask if anyone here has any favorites. ...
3
votes
3answers
604 views

Are USB thumb drives inherently more dangerous than other removable media? Why?

The general consensus I hear among security professionals is that USB drives are dangerous. In most organizations (that I have worked at), USB drives are either forbidden or employees are required to ...
7
votes
4answers
2k views

How to check if wifi is safe while travelling?

I'm quite a bit of a traveller. So i tend to just stay with my smartphone and sometimes notebook. I'm not a security expert but i would like to check how to know if wifi is safe to use. For example, ...
2
votes
2answers
937 views

How to write a rock solid TOTP implementation?

I am currently writing a TOTP implementation in PHP (but this applies to other languages as well) and of course want it to be as secure as possible, what should be considered? After reading the ...
1
vote
1answer
162 views

Are HTML Components (HTC) files a potential attack vector?

I'm working on a site that has a higher-than-normal concern for user security. I've recently been working on some CSS issues with older versions of IE (we support 7 and higher) and found that an easy ...
0
votes
1answer
403 views

Custom rest api / client security scheme

Right off the bat, I'd like to know if there is a widely used library or standard that I could adopt to replace my "custom" scheme. I am certain that I, as one person, cannot produce something better ...
0
votes
1answer
106 views

Banking platform accepts password containing subset of real password [duplicate]

How would it be possible that if my password was 123abc that my bank also accepts something like 123abc12? Isn't that an extreme security flaw? If the password was hashed and salted, wouldn't the ...
0
votes
1answer
240 views

LDAP and anonymous bind for PCI compliance

We have to setup a central auth for PCI compliance and I'm wondering if it's ok to allow anonymous bind or should I create a user to do the bind for the services needing ldap?
1
vote
2answers
892 views

What does Gazzang zNcrypt actually protect against?

In an effort to increase security of our website, I'm reading up on Gazzang zNcrypt, which claims to protect data in databases from breaches. Technically, it seems to do filesystem encryption. As far ...
4
votes
4answers
709 views

Signature instead of PIN, Visa card

Most of the credit cards require PIN to authorize transaction. Recently upon a transaction the merchant required my signature and not my PIN. I understand this is another sort of authorizing the ...
4
votes
2answers
188 views

Is it ok to email someone their password from a newly created account? [duplicate]

I have a pretty standard registration form. One thing I've decided to do away with is the requirement to enter the password twice, for usability reasons. In order to mitigate the increased risk of ...
4
votes
3answers
235 views

Is there any reason in particular encryption keys aren't arbitrarily large?

It's my understanding that the more bits an encryption key has, the longer it takes to break the encryption. What is the down side of having a larger encryption key or why don't we see keys of size ...
1
vote
1answer
323 views

Detecting Malware in the android App [closed]

I've been given an APK file, and before re-distributing to the "market" I want to make sure the given android app does not contain the malware. How can I do that ? Business use case is similar like : ...
1
vote
1answer
86 views

Ideal cryptocurrency digital signature

What are the characteristics of the ideal digital signature for cryptocurrency transaction verification? The reason I ask is because this answer about bitcoin signatures describes a potential ...
2
votes
1answer
4k views

Why is a CA certificate required for EAP-TLS clients?

When setting up clients with WPA2 EAP-TLS, most clients (ie: my phone, my computer) require both a client public/private keypair (for obvious reasons) and a certificate authority certificate. It's ...
0
votes
1answer
252 views

Can I use a vpn to securely use prototypes of webapps from my phone or laptop?

I want to experiment with web development (using django) for both desktop and mobile. Server, phones and desktops could all be part of the same virtual private network. The VPN will be from some ...

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