A runtime, architecture, and libraries for Microsoft Windows used for creating applications.

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3
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2answers
180 views

Guid salt - string vs bytes[]

Recently I got into passwords hashing (SHA256, HMAC-SHA1, PBKDF2, etc.) and one "statement" I've been reading over and over again, stuck in my mind and I can not find a satisfying answer. "When we ...
2
votes
0answers
91 views

OAuth2 Authorization and Resource server certificates

I'm implementing a custom IAuthorizationServerHost using DotNetOpenAuth library. Example implementation uses two certificates for CreateAccessToken (see Listing 6): public AccessTokenResult ...
1
vote
0answers
66 views

authentication model using oAuth

I am planning to use facebook authentication for my website window.fbAsyncInit = function() { FB.init({ appId: 'APPID', cookie : true, xfbml : true, version : ...
3
votes
4answers
105 views

How to avoid web service spam?

How can I restrict users from spamming my web service by sending thousands of requests? My web service is actually protected by a validation token only accessible through authentication, but I still ...
3
votes
2answers
152 views

Are compiler options relevant to C# security? If so, which options?

It is normal to list some extra-secure compiler options to prevent attacks on C and C++. However, I have not found any similar recommendations for C#. Are compiler options simply not relevant to C# ...
1
vote
1answer
224 views

Getting multiple key matches on plaintext/ciphertext pairs in double DES

I'm trying to implement a Meet-in-the-Middle attack and just to test it out I've done some hardcoding of values, which is simply this block of simple code: byte[] key1 = new byte[] { 0x20, 0x00, ...
1
vote
1answer
799 views

SSL communication between a C# Server and an Android Client App

I'm using a C# server and a C# tcp client example I extracted from the MSDN and I have created a self signed certificate using makecert.exe. I have got this to communicate with one another and it ...
9
votes
5answers
2k views

Gold Standard for password hashing

I've developing a web application that will be dealing with highly sensitive information and I want to ensure the hashing of passwords is gold standard. Ideally I'd go for per-user salted SHA512 ...
0
votes
1answer
238 views

Security benefits to have IP-filter in HttpModule instead of Page-Load in asp.net pipeline?

I'm working on implementing an IP-filter which blocks all requests by machines outside our IP-range. This is for an asp.net project (written in c#). I've read on multiple forums that the safest way ...
0
votes
1answer
50 views

Security of applications on .net platform

On .net we use SecureString class to keep our applications variables in memory, safely. Microsoft says: Represents text that should be kept confidential. The text is encrypted for privacy when ...
0
votes
1answer
152 views

The security of dll files in a Client/Server application in .net [closed]

I'm going to write a Client/Server application. There are some ambiguous concepts in this that I was not able to get answer to after many hours of searching. As we all know one of the major caveats ...
1
vote
1answer
94 views

Is the security of this .net application flawed?

Ok, I know that every obfuscated .Net application can be reverse engineered. And I know that it is better if I go the open source way if possible. But unfortunately I cannot because there is no ...
2
votes
3answers
242 views

What are the (practical) dangers of writing your own login method?

I have always been told that writing your own login method (e.g. validate user given the username and password) is bad practice, and that one should reuse existing libraries for that. I have always ...
1
vote
1answer
208 views

Are there any known breaches of the .NET AppDomain isolation?

.NET AppDomains provide several levels of isolation for untrusted or partially trusted code. The AppDomain sandbox is widely deployed in ASP.NET and Silverlight, although only the latter of these is ...
2
votes
2answers
200 views

Is Ignoring SslPolicyErrors while doing SSL Pinning Secure?

I am implementing SSL pinning as a security requirement for a project and the HTTPS endpoint is giving me SslPolicyErrors. The following errors occur, RemoteCertificateChainErrors ...
2
votes
2answers
5k views

SSL Authenticated SOAP Request works in SoapUI but not through code

I am connecting to a SOAP webservice that requires SSL authentication. I (the web service client) have a .pfx file and provided the public certificate for that file to the company whose web service I ...
2
votes
0answers
194 views

How to use IIS ssl certificate(CNG) for data encryption

I want to use RSA to encrypt/decrypt some data using IIS's ssl ceritifcate, from within a web service(WCF). I've managed so far to do this by using .NET security ...
2
votes
2answers
3k views

How do I sanitize LDAP input and prevent injection attacks? What LDAP injection scenarios are possible?

In the following C# example I'm querying AD's configuration container for Exchange overrides. If the domain name in unsanitised the end user could get LDAP to read a different object then intended. ...
6
votes
3answers
14k views

How can I detect a VPN connection (even just in some cases) to get the real location of the user

I'm creating a web site, I would like to allow people to sign-up only from their "real" physical location (not using a VPN). I was thinking maybe comparing local and server time... what else...? ...
0
votes
1answer
2k views

RSA key sizes v/s public key sizes

I am new to cryptography. I have an api provided by a bank. The banks says that they are using RSA algorithm with 2048 bits. We used this api first to get the public key. Here is the sample public ...
4
votes
1answer
98 views

Is the ProtectedData class still an acceptable method to store passwords?

I'm writing a piece of software which will have to store a users password to allow authentication with a 3rd Party service. Unfortunately, this service currently requires the use of a password rather ...
0
votes
1answer
65 views

How Secure is my Application?

I have created a little application in .NET that serves as a loader for my other applications. Essentially, when opened, this app will get a list of available applications, and when an option is ...
3
votes
2answers
908 views

How to securely use Process.Start?

I am using Process.Start in a Windows Service I created to execute an exe that I have on my server that is used for audio conversion. I am passing some user input as a parameter to this exe. The ...
4
votes
2answers
779 views

How to bypass .Net 4.5 request validation, for an XSS attack?

.Net has a feature called request validation which detects malicious inputs and blocks the request. By its nature, request validation is not a precise science. OWASP clearly recommend to only rely on ...
1
vote
1answer
421 views

Correct auth method using oAuth 2.0?

Been trying to wrap my head around oAuth 2.0, but I'm struggling figure out the correct way to implement it for our system, as there are so many different approaches. Our specifications are: Secure ...
2
votes
1answer
165 views

Basic Website Protection (XSS,SQL-inject,hashing)

I have a very simple app that does allow unauthenticated users to leave comments (maybe later I will incorporate a capatcha). The app then stores the comments in a mysql db. I do my best to filter out ...
5
votes
1answer
4k views

What's the risk of changing permissions of the Security Eventlog registry key to IT operations?

Background Many developers are unnecessarily lowering the security of the event log, or requiring applications to run in Administrator mode just so they can use the event log with this C# or VB code: ...
1
vote
0answers
35 views

Securing customer assets in .NET

We are rethinking our security and came on an interesting issue. How can me make a generic security implementation for customer owned assets. Does every asset need a direct-indirect relation to a ...
0
votes
1answer
59 views

generate certificate at runtime and validate

I have a project that require client application to register and then use the services. I would like to do the following: A client app sends a request with IP, domain name, etc. to my REST service ...
0
votes
2answers
314 views

Key Management/storage system

In my firm we have a couple of thousand hardware devices, installed externally, that all send back data to a central server. They send back data about every hour. Each of these hardware devices ...
7
votes
2answers
1k views

Is it a security risk to maintain an application developed for a version of .NET prior to 4.0?

I've had a request that we upgrade all our internally developed applications to .NET v4.0. Needless to say, this is a massive chunk of work. Is using applications based on the .NET framework prior to ...
1
vote
0answers
120 views

Why do we need salt and RFC in generating AES encrypted message

I'm not very familiar with encryption and new to this, I'm just learning it right now by code review of one of the class we have in an application to encrypt a password using AES. Would anyone explain ...
0
votes
1answer
120 views

Exposing Model to POCO in MVVM Entity Framework Application

To start with, I am dangerously bad at security. I am aware of this, which is why I'm asking for help to figure this out. I have a POCO object, which is exposing an ICollection of a model object, so ...
1
vote
1answer
850 views

Is there a way to verify a signed XML in Java

.NET has this great way to sign and then verify the signature of an XML file. Is there a way in Java to verify an XML file that .NET has signed this way? thanks - dave
-1
votes
1answer
250 views

Measures that must be taken to protect online banking website [closed]

I building an online banking service in ASP.NET and my objective is to implement all possible security measures. Currently at database level I am using RES 2048 bit encryption to encrypt database ...
0
votes
2answers
2k views

Difference Between MD4 and MD5 encryption

During coding, I have used both MD4 and MD5 encryption techniques. But there hasn't been any noticeable security difference between either of them. And yet, most of them prefer MD5, in fact specify ...
3
votes
4answers
491 views

Lock a website login to a certain computer

I've got a web based system where a specific site only shall be available on a certain computer. On that computer I have a desktop application. The desktop application and the website communicate ...
4
votes
1answer
388 views

OAuth2 - Is it safe to return the access-token to the user?

I'm new to OAuth (1 & 2), and I'm developing the server side of a mobile app that has a form with a "Fill Details from Google account" button. I don't need any long-range ...
0
votes
1answer
187 views

Is there any advantage in encrypting a password hash in my database?

I am hashing and storing the salt:hash of each user's password in our database. The web server is ASP.NET and the connection string to the database in web.config is encrypted using the IIS config ...
0
votes
1answer
8k views

How do I hash a password in C#? [duplicate]

I assume that the best way to handle passwords for a website is I create a hash of the password and save that hash in my database. Then when someone tries to login, I do a hash of the password they ...
3
votes
1answer
368 views

Does encrypting a setting in web.config actually provide security?

Does encrypting a value in the web.config file actually provide any real protection? It seems to me that any web app can read that setting. Yes that's more work than just reading the web.config file, ...
0
votes
1answer
136 views

How to identify hackers based on ip addresses and the pages that were accessed

I saw some suspicious errors being generated on my site based on pages that were requested. My error is logging the path that the user is trying to access. Because of these errors (and the paths that ...
1
vote
1answer
156 views

Developer Security Training .NET / JAVA [closed]

Hello my team is tasked to perform security focused training for developers (.NET and JAVA). I have used WebGoat to demonstrate OWASP Top 10 type security vulnerabilities and am looking for a similar ...
0
votes
0answers
161 views

Public/Private key validation

Suppose I have this scenario: User --> Inputs License Key --> I validate it --> If success, good, move onto main window. If not, prompt the user to reenter the license key. The license key will not ...
1
vote
0answers
89 views

SSRS custom assembly security issues

I want to invoke a custom assembly that uses protected services (like DirectoryServices, etc...) with reporting Services. On the web, I see a recurring example of configuration (inspired by this ...
0
votes
1answer
353 views

Are “Certificate Templates” used only as a “Template” or do they validate a certificate request?

I'm trying to learn how Microsoft Certificate Templates interact with a certificate request, and can only guess that they take on one of the two/three forms: They simply help the client create a ...
0
votes
1answer
238 views

Advice on using encryption and hashing

I'm going to rephrase a question I asked earlier, as I don't think anyone understood what I meant. Bascially I'm writting a web based password locker, which can have multiple accounts; so that users ...
0
votes
1answer
108 views

Using encryption and hashing

I'm writing a project to securely store and share passwords between users, I've been doing tons of research into encryption algorithms, CSPRNGs, hashing algorithms, key stretching etc... I just want ...
2
votes
1answer
387 views

Challenge Response Login Authentication with Password Salt

I want to implement a challenge-response login authentication for my web application. My understanding is that the server has to send back the password salt for the user so that the user can ...
3
votes
2answers
264 views

Authenticating AD user over TCP socket

I have a server that communicates with clients over a .NET socket. I want the server to authenticate the connection in an SSO kind of style by checking that the current user is in a certain group. ...