2
votes
1answer
59 views

Is this a safe way to identify users connecting to a chat server?

Before I start, all information will go over HTTPS. So, my website is basically like a forum with the authentication part finished and working. This forum has a real time chat application that sends ...
0
votes
2answers
57 views

Are there any flaws in my design for a paper-based OTP grid?

I'm trying to implement two-factor authentication on the cheap for a website of mine. My bank uses this sort of grid-based OTP system, so I wanted to emulate it in my application: Cards are ...
4
votes
0answers
107 views

Security concept for Android app with PHP based REST API

I'm trying to build my own PHP based REST Api for my Android app and I'm a litte bit confused by all the different user authentication stuff one can find on the internet. So I want to present my ...
4
votes
2answers
200 views

Safety of using web based proxy?

Lets say for example I have to use a public online proxy like https://www.zend2.com to load a PHP webpage controlled by me containing sensitive data over HTTPS. How would I make sure that the proxy ...
3
votes
3answers
215 views

PHP IP check as security?

Would just like some input on a PHP script I'm writing. It's just a simple script that only myself should be able to access. I don't have a dynamic IP address, so this isn't an issue for me, but I'm ...
-5
votes
4answers
178 views

user authentication my method (reinventing the wheel) is this secure?

I have read many articles advising to use OpenID, including Stack Overflow Q&A, for authentication. Unfortunately I can't use openid because my auth is not based on an email id - it is based on ...
-1
votes
1answer
56 views

login not working using hash_pbkdf2 [closed]

i am storing the password using hash_pbkdf2 but now ive hit on a problem my code : 1.for register $salt = openssl_random_pseudo_bytes(125);//salt $final_pass = ...
1
vote
2answers
175 views

Security of login form

I would like to know how secure is this code I made for a login form... because I'm new in this and have serious doubts. $sql = "SELECT user_name, user_password " ."FROM users " ."WHERE ...
8
votes
3answers
1k 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 ...
1
vote
2answers
459 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 ...
0
votes
3answers
330 views

Authenticate user without knowing their password

I'm working on a project where each each user will have a public/private RSA key-pair. Users will be able to send encrypted messages to each other using the each target user's public key so that only ...
0
votes
1answer
86 views

Service TO Service Authentication & authorization [duplicate]

I have two web services A and B the requests between those services is http. I want so establish a secure connection between service A and service B to ensure the authorized and authenticate request ...
1
vote
0answers
51 views

Is what flexi_auth does with its use of its $this->auth object good practice?

I am looking at the authentication library Flexi_auth for CodeIgniter. To use the library you have to create a object one time in the controller before the lib is used Like this: `$this->auth ...
2
votes
1answer
250 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
2answers
824 views

Google Authenticator - Counter Based [duplicate]

I'm trying to understand How google authenticator - counter based work. I have tried googling around finding a demo or at least how this work. I understand its a one time password but not like TOTP. I ...
2
votes
4answers
2k views

SQL Injection with pass MD5

I want to know, if in my login form there is any SQL injection possible. If there is, what could the exploit's web form entry look like? I send username and password by html form (POST). The login ...
8
votes
3answers
11k views

Is there any SQL injection for this PHP login example?

I want to write a login form, and I got one example from the web. I want to know, if there is any SQL injection for this code? If there is, what could the exploit's web form entry look like? This is ...
4
votes
3answers
621 views

Secure login system - using sessions?

I'm looking for a secure way to let users login on my website. Currently, I've always used a session system, like this: <?php session_start(); if (validPass() || isset($_SESSION['userId'])) { ...
2
votes
1answer
457 views

When checking a session variable to see if a user is logged in, is it enough to check to see if the variable is set?

When displaying a page with content only logged in users should see, I simply check if(isset($_SESSION['hasLoggedIn'])) { //show content } else { echo 'you must log in'; } In this article it ...
2
votes
4answers
376 views

When logging out of a website is anything else required then destroying the session?

In PHP, I'm not sure if I should start the session before destroying it when a user wants to log out. session_start(); session_destroy(); Is there anything else that needs to be done? EDIT: I ...
2
votes
2answers
350 views

How high is the entropy of this salt-generating code? (No code-reading actually necessary)

What is the best method? Assumption: I have a function that generates a number of medium-high entropy bytes Step1: I generate 3 of these medium-high entropy bytes. Step2: I hash these bytes using a ...
1
vote
1answer
283 views

Protect database resources from fake data inputs via web forms

Scenario: I'm working on a project that needs to accept large amounts of data (customer data) from its users. So it can be normal to have a user trying to add 10,000 or 100,000 records at a time. In ...
1
vote
2answers
639 views

Implementing SRP Challenge login system *with SSL* (Using PHP)

My question: Anyone knows how to implement SRP / Diffie-Hellman authentication in PHP (or if this has already been done)? (Some details) I'm using CodeIgniter with TankAuth (both latest version) ...
2
votes
1answer
181 views

Safe User Login Questions

I need help determining how safe the login is. First of all, I have been reading this: The Definitive Guide To Forms based Website Authentication It's really well written, great information most of ...
4
votes
3answers
4k views

Do you need to encrypt session data?

I came across a session management class in PHP which encrypts session data in the session storage folder (i.e., /tmp) and can be decrypted later in your script using a key. I was wondering if it's ...
5
votes
2answers
765 views

Could this login form be “hacked” to allow access?

We have this legacy website which has horrendous code in it. I have just been looking through the login form/code and can see un-sanitised sql queries. E.g. in a nutshell: $email=$_POST['email']; ...
1
vote
3answers
499 views

Login System Security Suggestions

I am creating a login system and was wondering if anybody had any suggestions. Here is my current setup: nonce to check if the login originated from our login form session and cookie auth mixed - in ...
5
votes
1answer
815 views

Is this admin area secure enough? V2

This is a response to my previous question, Is this admin area secure enough?. There were some very helpful answers there, for which I am very grateful. So I went back to the drawing board and here ...
4
votes
3answers
398 views

Is this admin area secure enough?

EDIT: Please view the revised question instead The admin area has special access to the database (modifying orders, etc). To help explain, I drew a diagram, so here is my process: Notes: I ...
6
votes
2answers
188 views

What to consider when generating random code as part of two-factor authentication?

I want to write a patch for a two factor authentication system that someone else has started. The code is a module for a PHP content management system and sends an SMS message to a user's phone, after ...
1
vote
2answers
194 views

TCrypto - Comments about design decisions I made?

I have pushed some code to GitHub to demonstrate the usage of symmetric key encryption in PHP. It is a small key-value storage library and it (optionally) offers ability to encrypt the stored ...
4
votes
2answers
440 views

Attack vectors in POSTing variables from one php script to the next?

I have an application which is structured in the following way for its signup page. After this signup, the user is directly granted access into the system - there is no email verification (as ...
34
votes
5answers
4k views

How to Securely Implement a “Remember Me” Feature?

Assuming you already have a website that implements all of the standard login stuff, what is the correct and most secure way to allow users to automatically be logged in for a certain time period ...