For questions relating to cryptography and IT security. This can be computer, network, or database security.

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2
votes
1answer
73 views

Security Pattern to store SSH Keys

I am writing a simple flask application to submit scientific tasks to remote HPC resources. My application in background talks to remote machines via SSH (because it is widely available on various HPC ...
1
vote
2answers
400 views

Is hashing of just “username + password” as safe as salted hashing

I want to hash "user + password". [EDIT: prehashing "user" would be an improvement, so my question is also for hashing "hash(user) + password". If cross-site same user is a problem then the hashing ...
1
vote
2answers
1k views

How do I / what is the best way to interact with a desktop application from a browser web application?

Situation: We have a desktop application. We also have a web application. We need the two to interact with each other. So when a button is pushed in the web application, the desktop application ...
1
vote
1answer
96 views

Testing for Authentication loop holes / bugs

We've got a web application which is 99% complete prior to public beta, were currenlty securing the site from security perspective, locking down the server, db etc, one thing I'm concerned about but ...
0
votes
0answers
339 views

Security in Transversal Layer in Domain Driven Design

I'm building a solution based on Domain Driven Design, I'm trying to implement the security system (authentication, authorization, roles, system configuration, connection strings, etc..) in a ...
1
vote
0answers
154 views

How to validate information on server without using database or session

Each user has multiple sites they can access reporting data for in an application I am working on. To prevent having to go to the database on every single request, I validate that they have access to ...
0
votes
1answer
70 views

Roles configuration strategy

We're close to start new project using sf2, and, probably, FosUserBundle. Keeping that in mind - what's the best strategy to define roles? App will be used by multiple divisions inside our company ...
-1
votes
2answers
562 views

Whats the best way to build a HTML/AJAX site that requires login? [closed]

Let's say that hypothetically you wanted to build a website that delivered content to the visitors entirely using HTML and Javascript (AJAX to fetch server side data). The site would require login for ...
0
votes
2answers
283 views

secure offline PC storage accessible through javascript

I'm attempting to build a browser-based HTML5 application that has the ability to store data locally on a PC (not mobile device) when offline. This data is sensitive and must be secure. Of course the ...
0
votes
2answers
389 views

Preventing ip resolvers in a skype-like program

I'm currently in the process of creating a Skype-like program, that uses a hybrid peer to peer system to communicate between users (i.e. server contains all users IPs, a client that wants to connect ...
0
votes
1answer
3k views

Zend framework 2 authentication - only storing the user ID in session

I've just put together my first app using Zend_Authenticate. According to some tutorials I've read they store the user's "email" column. Is this recommended? I've read to store the ID only, then on ...
2
votes
1answer
50 views

Privilege (Access/Permission) Control for Hierarchial Structured Resource

Question: Is there any standard model or industry defacto implementation for modeling and implementing Access Control in (i.e.) a Document Management System? Note: I studied a bit the security ...
2
votes
2answers
730 views

Best way of storing a small number of user credentials

I'm working on a messaging application, based on a server/client architecture. Now I am thinking about the way how to store the user credentials. It's not a huge number, just about 20 entries with ...
4
votes
4answers
2k views

How to store Role Based Access rights in web application?

Currently working on a web based CRM type system that deals with various Modules such as Companies, Contacts, Projects, Sub Projects, etc. A typical CRM type system (asp.net web form, C#, SQL Server ...
3
votes
4answers
120 views

Can I save & store a user's submission in a way that proves that the data has not been altered, and that the timestamp is accurate?

There are many situations where the validity of the timestamp attached to a certain post (submission of information) might be invaluable for the post owner's legal usage. I'm not looking for a service ...
8
votes
1answer
245 views

Securely sending data from shared hosted PHP script to local MSSQL

I'm trying to add data from a webhook (from a web cart) to a local Microsoft SQL Server. It seems like the best route for me is to use a PHP script to listen for new data (POST as json), parse it, ...
2
votes
0answers
182 views

Handling permissions in a MVP application

In a windows forms payroll application employing MVP pattern (for a small scale client) I'm planing user permission handling as follows (permission based) as basically its implementation should be ...
2
votes
1answer
470 views

Access Token Verification

I have spent quite a few days reading up on Oauth and token based security measures for REST API's and I am currently looking at implementing an Oauth based authentication approach almost exactly like ...
3
votes
1answer
1k views

Naming in Security Protocols: Alice, Bob and Eve [closed]

Among computer scientists and programmers, there's the common habit of naming people in the context of security protocols e.g. Alice, Bob or Eve. Descriptions of more elaborate attack vector sometimes ...
0
votes
1answer
75 views

Securing web services [duplicate]

How to approach securing webservices? I can think of using one of the two approaches below sending a user name password in every request for validation Sending a time based token (GUID or some ...
1
vote
1answer
148 views

Password reset process

So I'm working on my first password reset mechanism. I'm going with what I understand to be a fairly common procedure: User clicks "Forgot Password" User is prompted for email address If the entered ...
1
vote
1answer
189 views

What Kind of Source Control Do High Security Projects Use? [duplicate]

I was just reading this slightly older post on choosing a good source control system when I started thinking about how different projects use source control. Where I work we've essentially moved ...
0
votes
2answers
56 views

Hashing + security as it pertains to a theoretical file sharing site

These days it's possible to hash a file client-side, send the hash to the server, and have the server check whether or not that file is already uploaded. If it is, we can skip the file upload and make ...
1
vote
0answers
42 views

Online error reporting without network access

I have developed an application for android requiring no permissions, but the biggest downside of this is that I don't have error reporting. So, I was playing around for the past week with any ...
0
votes
1answer
459 views

What is the proper way to extract and pass parameters to call javascript functionality from my PHP page?

This is my situation: I have a search results page in PHP where most of the logic resides in a javascript file in order to avoid refreshing the page every time an action is performed. The first thing ...
2
votes
1answer
199 views

Standard ways of revoking user access to a site

I'm in the process of building a .NET MVC website where a requirement is that admin users should be able to lock accounts to not only prevent future log-ins but to also immediately revoke access to ...
1
vote
2answers
265 views

Hide admin menu if no admin option is available

If you have a menu "Admin tasks" and different admin tasks (like 10) that you could separately assign to each user, but there are users who don't have any admin tasks, how would you deal with "Hiding ...
0
votes
2answers
254 views

Are random number generators security holes?

If I retrieve a random number from a database (e.g. RAND() in SQL Server) or using a programming language and send this in some form back to a client machine, is there an economic chance I will be ...
1
vote
0answers
39 views

Domain security involving domain logic

Together with my application's domain logic I am trying to outline the security model. I am stuck with a requirement that prevents me from considering security just a cross-cutting concern over my ...
1
vote
1answer
824 views

Implicit OAuth2 endpoint vs. cookies

I currently have an app which basically runs two halves of an API - a restful API for the web app, and a synchronisation API for the native clients (all over SSL). The web app is completely ...
1
vote
1answer
528 views

Is it safe to generate client nonces using random number generator?

I am making HTTP calls on the client side and the server expects me to supply a client nonce. It needs to be 4 bytes long. I am planning to use this combination: base64(parts of the MAC address + ...
0
votes
1answer
193 views

Browser security and payments

I've been finding a lot of blog posts claiming JS encryption is unsafe, here's a couple of detailed ones: http://www.matasano.com/articles/javascript-cryptography/ ...
0
votes
1answer
81 views

Encyption for passwords in config file? [closed]

I was wondering, if it makes sense to encrypt passwords for external services stored in my config file with an symmetric encryption algorithm? On the one hand I think, if someone gets access to the ...
2
votes
1answer
490 views

Which automated analysis tools can find the heartbleed bug? [closed]

After reading this description of the infamous heartbleed bug, and how the OpenSSL team is relatively small and lightly funded, I'm wondering: would this bug have been uncovered by coverity, valgrind ...
0
votes
1answer
184 views

What are security advantages of Google Caja over using the web worker API? [closed]

I am currently looking into Google Caja to run user-supplied JS code in the browser and in Node. So far, I understand, that, in a browser context, "cajoled code" disallows reading and messing with ...
1
vote
4answers
148 views

Is secretive systems development really possible?

An agency wants to develop a highly secret computer system using public contractors. So they hire different companies to implement different components of the system. When all the components are ...
1
vote
2answers
676 views

Is displaying an HTML email a security risk?

I am writing a simple webmail where I want (obviously) to display the emails. I'm wondering if I should take any precaution while displaying HTML emails: is dumping the email content into a ...
10
votes
6answers
2k views

Why do most sites require email activation [closed]

Most popular applications nowadays require account activation by email. I've never done it with apps that I've developed so am I missing some crucial security feature? By email activation I mean when ...
2
votes
2answers
1k views

When is the private key given to the client? [closed]

http://www.thebuzzmedia.com/designing-a-secure-rest-api-without-oauth-authentication/ I've been reading the article and I haven't really grasped it yet. When is the private key given to the client? ...
0
votes
2answers
428 views

How do I access databases from a mobile device securely?

I have been doing some research on accessing a DB from mobile devices. There are so many different ways of doing it. There are also multiple ways to make it secure. What is a good way to access a ...
2
votes
5answers
421 views

secure photos on server [closed]

I would like to hear advice from the more experienced developers. The project is now in the design stage. It's mobile application and a simple web application. Content is pictures, comments, personal ...
0
votes
1answer
89 views

Is there a design pattern for updating lists?

I want to modify one list (actually info stored in a database). A person doesn't have access to update every part of the list, but can update and delete parts they do have access to and add whatever ...
1
vote
2answers
3k views

How to avoid unauthorized use of an API?

I have to design a "widget", a script that partners will embed in their websites to display some UI and make calls to our API. Basically it will display our data on these sites based on some IDs they ...
2
votes
1answer
115 views

How is same-origin policy implemented?

I was looking at cross-domain requests for a design and stumbled upon something that puzzles me. From a local site I'm firing an Ajax request to another domain (with jQuery and vanilla ...
1
vote
1answer
66 views

Is this mini-DSL for hiding URI passwords compatible with the URI spec?

Passwords exposed in URIs An application stores URIs to be used for file transfers via SFTP, FTP, FTPS and SCP. Many of these URIs contain passwords, for example: ...
0
votes
2answers
327 views

Snapchat clone: How do I secure pre-downloaded notifications so that they cannot be opened outside of the app?

Say I'm making a snapchat clone app for Android and iOS. Let's say that I get a snapchat from Baz. I want to pre-download the audio for this snapchat. However, as the developer, I want to secure this ...
1
vote
4answers
302 views

Is just using an email address for login a good idea?

Many a times I need to log into a website that I used months ago and have forgotten my password. So clicking the reset password link and the site sends me an email with a single use link which allows ...
13
votes
4answers
878 views

What to do when your company doesn't encrypt passwords

Background I'm been contracted to help a company maintain their server. I work on some minor PHP projects but also look over performance issues and recently, scan logs for hackers. These guys have ...
1
vote
2answers
191 views

Fixing a security exploit - but then everyone knows about it

Earlier, I was messaged about a potential security risk in one of my projects. I checked it and found that it allows for "arbitrary code execution". (Quotes because it is running in a VM, but the ...
1
vote
1answer
411 views

How important is an SSL certificate for a internal website?

I know many people have asked the same question but I think it really depends on the type of the website. So that's why I am asking the question about my website. I am developing a PHP web ...