26
votes
6answers
9k views

Could SQRL really be as secure as they say?

I just came across https://www.grc.com/sqrl/sqrl.htm With Secure QR Login, your phone snaps the QR code displayed on a website's login page . . . . and YOU are securely logged in. This ...
1
vote
3answers
7k views

how to prevent arp poisoning on my network?

Some users on my network using wifikill or netcut to prevent other users from accessing the internet [ ISP's router: public IP ] - [ gateway: public IP eth1 - network eth0 (NAT) ] - [ switch and ...
0
votes
3answers
90k views

Can he see the websites I visited? [duplicate]

I live with someone in the same house so we both use the same wifi. He knows the wep password because he set it up in the first place. He's not a hacker but he can set the wifi system at home. He has ...
46
votes
2answers
9k views

Best practices for Tor use, in light of released NSA slides

It has been known in the security community that a tool as versatile as Tor is likely the target of intense interest from intelligence agencies. While the FBI has admitted responsibility for a Tor ...
2
votes
1answer
78 views

Authentication of support engineers on client systems

Are there any good methods for authenticating that a user is a maint engineer, or at least trusted enough to use the maint access? The environment is code that is running in client sites, without ...
4
votes
1answer
747 views

Is possible that a TLS server send more than one certificate to the client for the same site?

What I'm trying to archive is enable ECDSA and DSS ciphers in my site, but at the same time not depend just of self signed certificates, so I could sent to my client more than one certificate and them ...
1
vote
0answers
110 views

Techniques for web-user communication across an untrusted server

I'm designing a web-based notification framework (i.e. a user can subscribe to updates from a service or another user) where communication between users is encrypted. User-to-user communication on ...
4
votes
1answer
656 views

What are the implications of using the same DH parameters in a TLS server?

For a DHE cipher, nginx hard-codes the Diffie-Hellman parameters to use base 2 and a fixed 1024-bit prime (modulus) if no custom DH parameters are configured. These parameters are public (sent in ...
4
votes
1answer
1k views

What could be the order of these ciphers following as first criteria the security and just then the performance?

I need some guide to decide in which order I must put the following ciphers if I want prioritize security and in cases of tied, consider performance to decide. ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 ...
3
votes
3answers
2k views

Extracting the PGP keyid from the Public key file?

is there a way via an CLI tool or some kind of API to extract the PGP KEY ID from the PGP PUBLIC KEY BLOCK ? I did find the hexa value of the key in the binary file, however I guess the position is ...
4
votes
1answer
635 views

Open-source alternative for CryptGenRandom?

Let's say that for some reason I don't trust CryptGenRandom. Are there any open source software Windows entropy collectors to get cryptographically secure random numbers from for seeding purposes? ...
2
votes
1answer
207 views

Torception: An onion within an onion

With the recent takedown of silkroad, I am pondering on how anonymous you actually can be on the Tor Network. Other more legal or moral uses such as anonymity as a right, or avoiding censorship. These ...
0
votes
1answer
89 views

Would this form of more seamless e-mail confirmation be secure?

When you ned to confirm that an email address belongs to a certain visitor to your site, would it be insecure to do it as follows: When the user visits your site, you give them a session token as a ...
-1
votes
1answer
74 views

What are the security features of the proposed “secure email” from Brazil? [closed]

Brazil has announced that they will create a secure email alternative in light of NSA spy programs. The company Correios will be implementing the contract over the next year or so. What are the ...
5
votes
2answers
2k views

How can I check the integrity of the downloaded files?

I know we use hash functions to check for the integrity of the files etc... but my question is how can we check for the integrity of the files being downloaded from some server?
0
votes
1answer
427 views

The Hash header in GPG ASCII armor

When sending a signed message using GPG, it always includes a line that says Hash: SHA256 right at the top of my email. I was wondering if/why it's required, and if not, how I can remove it (in an ...
47
votes
10answers
24k views

Can a steel woven wallet prevent RFID scanning of credit card information?

According to the Popular Mechanics article RFID Credit Cards and Theft: Tech Clinic, the fact that many new credit/debit cards have a RFID chip embedded on it, there is a risk (albeit, small according ...
10
votes
3answers
636 views

Should a hostname ever be considered a secret?

I've been told in the past that you should never give out the host names of computers on your network. I can't think of any reason why this would be the case. Could someone tell me if they should be ...
0
votes
1answer
1k views

Why Qualys SSL Server Test is giving me 80 and not 100 in Key Exchange?

My openssl ciphers -v 'CIPHER' output is the following: ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA ...
3
votes
2answers
304 views

Using Remote Desktop to bring a 3rd party application to all my employees

Recently I have been approached by various SaaS (Software as a service) providers offering me different scenarios to deliver their solutions. One in particular has my 50 employees accessing the ...
2
votes
3answers
15k views

How force that all connections to my Apache use TLSv1.1 or TLSv1.2?

I tested on Ubuntu 12.04 (apache 2.2.22-1ubuntu1.4 and openssl 1.0.1-4ubuntu5.10) and Ubuntu 13.04 (apache 2.2.22-6ubuntu5.1 and openssl 1.0.1c-4ubuntu8.1). here explain how to do so, but I have the ...
1
vote
1answer
212 views

SSL on domain will affect un-secured sub-domain

I have a plan to buy a SSL certificate for my domain. I don't have much budget so I decided to buy standard SSL with no support for sub-domains. I have a WCF web-service that works on sub-domain. This ...
2
votes
2answers
423 views

Where does the WPS Pin fit into the 4-way-handshake?

So I found a diagram online, that shows the 4-way-handshake: The way I understand it, when a station (STA) is trying to authenticate to an access point (AP), the AP sends the ANonce (authentication ...
14
votes
3answers
5k views

Is it possible to do SQL injection (HIGH Level) on Damn Vulnerable Web App?

I searched all over google to see how it would be possible to bypass the following (it's from the high level of security from DVWA): <?php if (isset($_GET['Submit'])) { // Retrieve data $id ...
2
votes
5answers
2k views

How can a non-technical user verify a message was sent “securely”? …or over TLS?

I have a situation where B2B and B2C communication needs to be sent securely and not visible to most SMTP hijackers. I don't care about conspiracy theories or NSA style attacks, but want to provide ...
3
votes
2answers
3k views

Is it practically possible to spoof a WLAN access point?

I want to try something out, but I wanted to see other opinions from you guys. What I have: WLAN Access point, with WPA2, ESSID: testing. Home router, I can change the configuration and everything ...
1
vote
2answers
315 views

How to defeat CRIME, BREACH, TIME etc… server side (without sacrificing compression)

I am writing full-stack server side software and I have been researching CRIME attacks and it's relation to SPDY header compression as I am implementing the server side codecs for it at the moment. ...
2
votes
1answer
160 views

Danger of peer to peer software [closed]

I wanted to ask what are the risks of using P2P software. I found a lot of information on-line regarding the danger of file sharing but not about the software by itself. I am writing a mobile ...
1
vote
1answer
112 views

How can I block flash from obtaining a list of available fonts in my browser? [closed]

How can I block Flash, at least in Chrome, from obtaining the list of available fonts in my browser? It seems that the combination of fonts available is the easiest way to fingerprint a browser.
21
votes
2answers
4k views

In the SilkRoad takedown, what does it mean “An IP address was leaking” in Tor?

According to the official complaint, on Page 28 they mention: on May 24, 2013, a Silk Road user sent him a private message warning him that "some sort of external IP address" was "leaking" from ...
3
votes
2answers
284 views

Is it true, that using symetric encryption, if attacker knows encrypted text, original message, and algorithm means he can calculate the secret?

I am a newbie in the security field, so sorry for the naive question. In my understanding, using symetric encryption, if attacker knows encrypted text, original message, and algorithm means he can ...
2
votes
2answers
204 views

Transparent way to send logs from honeypot to logging server

Does anyone know of a secure and transparent method of sending logs from a honeypot server on a DMZ to a logging server in a private network?. The logs must be encrypted and sent in such a way that a ...
2
votes
1answer
360 views

Communicate between two sites both with SSL

I now have two websites - site A and B, both with SSL-certificate, and they have exact same users. So when a user log into site A and click the link to site B, I want to make him auto log in to site ...
0
votes
1answer
199 views

Possible to determine what plugins and versions are being used in a wordpress site?

I have been thinking about creating a Wordpress vulnerability scanner that would look for plugins being used by a Wordpress site and then search osvdb for known vulnerabilities. I'm curious if there ...
1
vote
2answers
111 views

non-MiTM Reverse SSL

Do non-MiTM Reverse SSL Proxies exist? Or do all proxies that do SSL-SSL mappings decode and then re-encode HTTPS traffic? If this is the case and I want to map https://mypublicdomain.com -> ...
4
votes
4answers
501 views

Is packet sniffing a risk on VPS? If so, what precautions should I ask my host if they take?

I'm wondering if packet sniffing is a risk on my VPS. Is it always a risk or are their precautions a host vendor can take? e.g. a switched network etc. If I wanted to ask my host what precautions ...
0
votes
3answers
822 views

Authenticating users to Web Apps without sending password — can anyone suggest improvements?

I have been interested in implementing authentication method for a web app that is run in modern browsers, without having to send the password over the wire. Can anyone suggest improvements or even ...
1
vote
1answer
395 views

MySQL AES Encryption - Is it good idea to store 3rd Party Auth Tokens using AES Encryption?

I need some advice on MySQL AES Encryption. I'm developing an application which connects to various 3rd-Party APIs and retrieves the Access Tokens for the application users. These Access Tokens are ...
3
votes
2answers
387 views

Plausibly deniable SSH - does it make sense?

My colleague just told me he can't make outbound SSH connections in his corporate networks, so I advised him to set up a server on 443 port and it worked. I then started thinking that the ...
3
votes
1answer
1k views

How does time-limited trial software work? [closed]

I'm curious about how time-limited (e.g. 30-day trial) software works. I know how serial keys are generated and designed, but the time-limiting part is more complicated to understand, because it is ...
3
votes
1answer
606 views

Limit BitTorrent Sync connections to a specific network

Is it possible to limit BitTorrent Sync connections to a a specific network using the client software? Right now the closest I can come up with would be IP limitations imposed on each client using a ...
1
vote
1answer
93 views

Oracle database privileges [closed]

I have a 10.2.0.5.0 Oracle Database and a list of users who i need to grant some privileges to (Mainly to generate reports and so on). I used impersonation, which means i created one Oracle user so ...
0
votes
1answer
102 views

Browser Extension to show how your session is being shared

A while back I came across a browser extension (was available for Firefox and Chrome, maybe others) that showed you through a graphical 'node' interface how your browser session was shared with so ...
1
vote
4answers
307 views

What can a zombie computer feasibly install and run?

I'm experimenting with a Proof of Work system that tries to force the use of a browser in order to solve the client puzzle. Basically, instead of just handing off the puzzle as hash with a well known ...
1
vote
2answers
352 views

What is (“ASCII” redundancy) which is said to be required to retrieve the original plain text in 2 times pad?

Sorry for the long title :$ In a video speaking about attacks on the one time pad which uses psudorandom generators (PRG), It's said that Eve can retrieve the plain text of 2 messages that have been ...
1
vote
2answers
231 views

Which information does a standard router see?

I currently use the WLAN of my neighbours (with their accordance). It uses WPA2 and the DSL router is a Fritz!Box 7170 (see English manual). Which information can a user with an admin account of this ...
0
votes
2answers
501 views

How does the Mega-D BotNet send spam?

I have just been reading an report that analyzed the Mega-D Botnet, but what I haven't fully understood is how they are used to send spam? What email address is the mail sent from? Does each bot ...
-6
votes
2answers
4k views

I know the WPA-PSK secured wifi password, If I use the wifi, will I be caught? [closed]

I hacked the WPA-PSK secured wifi password from one of the wifi network. If they track their DHCP Client IP, will I be caught? If yes, how? By my computer name or IP address or MAC Address?
3
votes
2answers
21k views

nf_conntrack: table full, dropping packet

I see a lot of these messages in /var/log/messages of my Linux server kernel: nf_conntrack: table full, dropping packet. kernel: __ratelimit: 15812 callbacks suppresse while my server is under DoS ...
1
vote
1answer
1k views

Skype chat history and web browsing history CHECK

In an office work place, can a network admin have access to my Skype chat history and web browsing history without logging in to my pc since all pc's are connected with the same network? i am ...

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