1
vote
0answers
57 views

Wireless entry systems why not use pre-shared noise?

I think the title question speaks for itself, but here are the details: You have 4 bits for the buttons, 16 bits for the counter, and a fix 16 bit ID. The transmitter would send out these bits plus ...
2
votes
3answers
178 views

Is it a good practice to include a download URL of my GPG public key in my email signature?

I was wondering if I can put a download URL for my recipients to get my GPG public key easily in my email signature. Is this a good practice? If not, what's a good alternative?
3
votes
1answer
402 views

Avoiding Replay Attacks on Lightweight Channel

I'm in the process of building a network of small devices (ARM microcontrollers with something like nRF24L01 connectivity). The controllers will be receiving commands from a central system over these ...
1
vote
2answers
211 views

Using “Dynamic Hash Technique” to protect cookies from XSS?

This paper appears to describe a solution in which XSS attacks stealing cookies are made pointless by having the server send clients a cookie with a hashed name. Whenever the user sends the cookie ...
6
votes
1answer
2k views

Dynamic vs Static root of trust

In TCG specification (for TPM devices) they specify how a static root of trust can be built up using secure boot and trusted boot. An alternative method appears to be Intel's Dynamic boot using their ...
5
votes
4answers
7k views

Is it possible to recover securely deleted data from H.D.D using the forensics?

I just want to know if it's possible to recover and see securely(or wiped out) deleted data from H.D.D using forensics ? Imagine police have arrested a hacker and that hacker,before getting ...
38
votes
5answers
6k views

Why do some websites enforce lack of SSL?

When trying to visit https://www.ebay.com, I noticed that I get redirected to HTTP immediately. Here's what cURL says about that: $ curl --max-redirs 0 -v -L https://www.ebay.com * Rebuilt URL to: ...
4
votes
2answers
186 views

Should I set different passwords for different Wi-Fi bands?

My new router supports both the 2.4 and the 5 Ghz bands, and it obviously allows me to set a different password for each of them. Now, since cracking just one of the two means that the attacker would ...
1
vote
2answers
931 views

Digital Signatures of XML, PDF and Office Documents on every platform

I'm trying to develop a website that performs digital signatures on client-side and then sent the signed document to the server-side. I want to do the signatures on client, due to the fact of not ...
0
votes
3answers
200 views

Is it ok to send user's private key away, even if protected with a SSL channel?

I'm developing a webserver that performs digital signatures of (xml, pdf and office) documents and then validates those signatures. My idea is: an user puts its SmartCard and through a PIN, he gets ...
0
votes
4answers
160 views

Is it ok to send user's private key away, even if protected with a SSL channel? [duplicate]

I'm developing a webserver that performs digital signatures of (xml, pdf and office) documents and then validates those signatures. My idea is: an user puts its SmartCard and through a PIN, he gets ...
1
vote
2answers
162 views

Detect blocked reverse shell

I am wondering if there is a way to detect if a reverse shell is blocked by egress filtering or an obligatory proxy, or the exploit just failed. I am asking this question in the context of a SE media ...
3
votes
3answers
467 views

Windows Authentication to protect API

One of my colleagues has a web api call that is checking that the user is logged in and his token matches what is in session (thanks to all of you for your help). Let's say this is layer blue. After ...
4
votes
1answer
5k views

HMAC solution for a rest API

I'm trying to learn some things about REST apis and one of the topics that I'm having some trouble is security. I'm using angularjs for web interface ans slim framework for the php api. I've read ...
5
votes
1answer
3k views

google certificates correct CA [closed]

I view certificates of https://www.google.com.ua/ So I thought, when requesting via cURL, if I point by CURLOPT_CAINFO to those certificates (GeoTrust Global CA and Google Internet Authority G2 in ...
2
votes
1answer
593 views

What's the use of certificate on Load Balancer and Keystore on Service?

Consider a scenario where my service is using a keystore made of self signed cerificate and the load balancer which is balancing traffic for service is binded with a CA approved certificate. I would ...
9
votes
1answer
255 views

Download mirror security

As with a large amount of open-source softwares, (Debian, Eclipse, PHP) you can apply to become a mirror of their site/downloads. I fully understand that this helps them with bandwidth and ...
1
vote
0answers
401 views

Preventing access to my public REST api from my trusted client application

I own a set of REST APIs and some of them don't require users to be authenticated. Example could be: api/items/index of an e-commerce". Currently, I use Cookie-based tokens from my application, but ...
10
votes
1answer
997 views

Would using Google reCAPTCHA allow Google to cheat?

Wanting to go a step further into reducing the attacking surface from my "register new user" form I think on using reCAPTCHA (the one Google offers). Having bots sorted out from being able to ...
2
votes
1answer
179 views

What to do with the extra bytes in ECDHE-RSA-AES-GCM-SHA?

I'm trying to implement, as an exercise, a protocol based on the cipher suite ECDHE-RSA-AES256-GCM-SHA384. As I understand things, ECDHE is used for the key exchange, RSA for the authenticity of the ...
2
votes
1answer
701 views

php crypt - trailing dollar sign - extract only the salt part from hash - padding the salt

I am reading up on PHP's crypt() function. I have a few questions on it - What is the significance of the trailing '$' sign at the end of the salt string that I see in most examples. The manual ...
0
votes
3answers
75 views

Security checks on file transfer [closed]

What are the security checks that I can make on a PDF file being transferred between server and the client?
15
votes
8answers
21k views

Encrypting files on Google Drive

It's my understanding files kept on Google Drive are not protected. I would like to have them encrypted so that to be able to view or modify them one must enter a password. I foresee a potential ...
3
votes
2answers
107 views

How to know the time of compilation

I've read that a malware found by kaspersky was compiled at the moscow time zone. How they know the time of compilation ?
2
votes
2answers
360 views

What's wrong with a website including a password in a confirmation email? [duplicate]

I recently registered for a website and received an email that said "Thanks for registering, here's the username and password you used to sign up". The webmaster assures me that plaintext passwords ...
0
votes
4answers
118 views

Isolate dual system

Say I have a computer with 2 operating systems: one secure, one... not so much. Now say I want to use the insecure system to do some work I can't do on the secure one. What is the best way to isolate ...
1
vote
1answer
179 views

Behavior of trusting a self signed SSL certificate

I have just deployed a Turnkey appliance which comes configured with a self signed certificate. This is a server that only I will be using, so I don't want to pay for a certificate. If I add this ...
2
votes
2answers
715 views

Internal / external Penetration testing a webserver - PCI

the PCI DSS document states: 11.3.2 Perform internal penetration testing at least annually and after any significant infrastructure or application upgrade or modification (such as an operating ...
20
votes
4answers
2k views

Is it possible to boot an encrypted server remotely and securely?

Imagine you have a server that is at a location which is not trustworthy. People might have physical access to the machine who are not supposed to look at the data stored on it. In this scenario I ...
1
vote
1answer
603 views

How can this be possible? (malware autoinstall on chrome)

I have a website, using an ads service (qadabra). Yesterday some users reported me that the ads service sometimes redirects to a site containing malware. the url is this: PLEASE DON'T OPEN IT, IT ...
1
vote
2answers
86 views

Criteria for an ADSL wireless modem

I'm going to buy a new ADSL wireless modem, and what really matters to me is security. So, what are the criteria I should consider, and which security features should I look for? How should I compare ...
4
votes
3answers
1k views

Is STARTTLS a security-vulnerability?

After reading about STARTTLS and SSL and performing a scan/pentest at our server I have the next question regarding security: Is this STARTTLS warning below a security-vulnerability? And if so why? ...
1
vote
0answers
56 views

Does Active Directory Certificate Services support Card Verifiable Certificates?

Does Active Directory Certificate Services support accepting requests for, and generation of, Card Verifiable Certificates (TR-03110)? If so, in which version of Windows Server was the functionality ...
2
votes
1answer
372 views

IPSec sequence number

I was going through a study of IPsec and I found that there are redundant sequence numbers: one in the AH or ESP header, and the other is in the TCP header for a communication. Is it not an ...
1
vote
1answer
596 views

Increasing tomcat session id increases security

Tomcat gives a configuration sessionIdLength to be configurable, but does increasing the session id increases its security or its just security through obscurity
6
votes
4answers
809 views

Relationship of password strength and key strength

I have just started educating myself about cryptography, and while it is mostly making sense, a few things are still eluding me. One being: In systems that take a user's pass-word/-phrase in order to ...
3
votes
4answers
684 views

What RHSA, RHEA and RHBA stands for in the RedHat Erratas?

Do you know what does RHSA, RHEA and RHBA stands for in RedHat Errata ?
-1
votes
1answer
2k views

MCRYPT_RIJNDAEL_256 max key allow? [closed]

maximun key for MCRYPT_RIJNDAEL_256 ? mcrypt_encrypt( MCRYPT_RIJNDAEL_256, <<==hash_hmac using sha512==>>, $text, MCRYPT_MODE_ECB, $iv ) Warning: mcrypt_encrypt(): Size of key is too large for ...
1
vote
1answer
200 views

Is there any way to restrict multiple access to my server at the same time using one client certificate?

My Server is Windows 2008. Mr. X is accessing my web server using Mr. X's certificate. In that time, an outsider is also trying to access my server using Mr. X's certificate (somehow he got it). Is ...
1
vote
1answer
887 views

How to configure Suricata to not interfere with virtual machine [closed]

I'm currently planning on setting up Suricata as a firewall on my laptop. I'm wondering however if it's possible to set Suricata to not interfere with traffic to and from specific virtual machines ...
0
votes
1answer
157 views

What would be a valid approach to store private keys?

I'm implementing a mobile app which uses AES encryption algorithm to encrypt some critical values being sent to a remote server (basically, the user password), and then decrypted on the server side ...
15
votes
4answers
9k views

What Trusted Root Certification Authorities should I trust? [duplicate]

After two recent Slashdot articles (#1 #2) about questionable Root Certificates installed on machines, I decided to take a closer look at what I have installed on my machines. (I use current versions ...
4
votes
2answers
1k views

How to know which output length to request from PBKDF2?

I feel like I'm asking a fairly obvious question here, but with it being so easy to make mistakes in this space, here goes. From wikipedia: DK = PBKDF2(PRF, Password, Salt, c, dkLen) dkLen ...
3
votes
1answer
108 views

When implementing an OAuth provider, what is the right granularity for a “scope”?

If I'm an OAuth provider and I want to empower the user to restrict apps to only a subset of resources (for example, only resources in folder X), what is the right mechanism to do this? Scopes would ...
1
vote
1answer
112 views

Why is the read write speed of a Protected DVD so slow?

I got a DVD with copy protection enabled on it, but the problem I am facing is that it loads extremely slow. I have seen such happenings with other kinds of protected DVD's as well. Can anyone tell ...
1
vote
0answers
131 views

Yet another newbie security paranoid user authentication [closed]

I am building yet another website which requires user and session authentication. This time I want to be complete security paranoid and actually care if the passwords or sessions are stolen. I have ...
3
votes
4answers
10k views

Exploiting through a filtered port

I'm doing some pentesting against a machine the lecturer set up in the lab. NMAP shows port 445 to be filtered and Nessus confirms the ms08_067 vulnerability is present on that machine. I tried ...
1
vote
2answers
722 views

Using EncFS on a USB drive

I am using EncFS with a USB drive. How secure is this if my USB drive gets stolen? I ask because the .encfs6.xml file is saved in the USB drive and I can open it with a normal text editor. Do I ...
1
vote
1answer
517 views

Is this where a nonce comes into play?

I'm reviewing a website a friend developed, and was looking for general errors and concerns. In reviewing I noticed he is very heavy on ajax calls using JSON to a RESTful API that he maintains on a ...
3
votes
3answers
651 views

What are the benefits to a two-page login system for a webapp?

I have noticed many website going to a two-page (not two-factor) login system - where you enter your username on page 1 and click submit, and then enter your password on page two and click submit. ...

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