Authentication - establishing the authenticity of a person or other entity. Not to be confused with authorization - defining access rights to resources.

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Auth / Login token schema

According to this answer, a valid login token schema would consist of the username (U) the time of issuance (T) and secret key K owned by the server only The suggestion then is to concatenate the ...
-2
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0answers
31 views

Restrict a user to SSH authentication with a key [migrated]

Is there any possibility to restrict the password based authentication to a particular user in Solaris 10? The particular user should not log in with a password. Instead he should be able to log in ...
9
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1answer
344 views

How does a SIM card prevent cloning?

I have read a few articles about SIM cards, stating that the chip inside them uses some cryptographic magic to prevent people from cloning your number. This to me seems borderline impossible, given ...
175
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17answers
11k views
+500

Passwords Being Sent in Clear Text Due to Users' Mistake in Typing it in the Username Field

Upon reviewing the Logs generated by different SIEMs (Splunk, HP Logger Trial and the AlienVault platform’s SIEM) I noticed that for some reason quite a few users tend to make the mistake of typing ...
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1answer
26 views

How can LastPass enforce 2-factor authentication

I've recently started using LastPass and one of the things you can set as a policy for you password vault is Prevent offline access when using Google Authenticator. The local cache can be ...
7
votes
3answers
344 views
+50

LastPass Grid Authentication vs Google Authenticator which one is more secure?

[Being a LastPass user] recently I moved to Google Authenticator instead of using Grid Authentication as a 2-factor security. For me, finding and filling letters from such a dense matrix is a rather ...
0
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1answer
24 views

Better way to store user authentication on phone app

We are creating an app and registration of user happens in following way. User sends via app: email-id/phone and username. Server sends a pin to enter in app via phone/email. User enters the pin in ...
3
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3answers
583 views

Websites Forcing Weak Password Standards (Updated) [duplicate]

Please Note: I am not going to name the websites which have these horrible standards for their clients and users. I have had to change my passwords for my routine update just recently in the last ...
3
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3answers
124 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 ...
5
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2answers
654 views

Website: Pre-Shared-Key Authentication

We have this web-application with high valuable (business) data. All communication is encrypted through TLS/SSL. While I consider this a really safe protocol, it can still be compromised if someone ...
6
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1answer
77 views

4 bytes authentication problem

I have a classic security problem where Alice needs to prove its identity to Bob but with quite unusual requirements and constraints due to a M2M context. EDITs in bold The communication channel ...
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1answer
76 views

security in banking app with 4 digit pin code and social security number

The new banking app (for norwegian bank Gjensidige bank) for my android handset allows me to log in using only my social security number, and a 4 digit pin code. The social security number in norway ...
2
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0answers
28 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 ...
0
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2answers
37 views

client SSL authentication .pem file and .crt files

So I have minimal knowledge of security really but I'm a primary developer on an application which handles some sensitive data that we want to be secure. The application communicates with one other ...
0
votes
2answers
69 views

Encryption mechanism

I want to send data over the Internet securely. For that, I am using an public key of the receiver to encrypt the data. In this case, if an intruder in the network modifies the data, like placing the ...
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0answers
21 views

OAuth2 - Resource Owner Password Credentials grant

The OAuth2 spec describes the Resource Owner Password Credentials grant type and authorisation flow here. I understand that only 'trusted' client applications would be allowed to use this grant, for ...
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5answers
242 views

Secure login feature with low CPU power

I'm developing a program that contains a login function in C++. The problem is that I don't know how to develop it in my situation. I want to run the software on a raspberry pi, it only has a CPU ...
0
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0answers
23 views

Secure access of web application on a newly created AWS instance using the associated keypair

I create an AWS instance using a private AMI (Linux) with an embedded web application (Jetty) which is activated on instance start. As soon as the instance is launched first time, I want the ...
3
votes
1answer
183 views

Exporting data beyond a cryptographic boundary

Scenario We're working on putting a FIPS 140-2 compliant SQL database on a dedicated machine behind the internal firewall of an organization, and need the capacity to push a specific document or ...
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1answer
73 views

Single sign on - is this a secure way to log in?

I am fiddling about with a sort of single sign on procedure. Let's say there is site1 and site2 and both use an SSL certificate. Users are signed in on site1. I was wondering what the experts think ...
21
votes
3answers
2k views

How is Google Chrome managing authentication to sites?

In Chrome, every tab is its own process. Yet, logging in to a site, say, Facebook, persists across tabs. For that matter, in many cases, it persists across OS reboots. This seems inherently very very ...
2
votes
1answer
111 views

Is it legal to “use” security vulnerabilities [closed]

I understand that the answer to questions like this depend on country, but I'd like to get an idea what the usual approach to cases like this are. Heres the case: I found a security hole in one of ...
4
votes
2answers
115 views

Safety of using online 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 ...
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votes
0answers
22 views

IBM TAM and Webseal for securing web applications [closed]

I have to evaluate which are the best Products to secure numerous web applications that are running in an Organization. I also need to enable SSO for them. The two products that I am considering are ...
0
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2answers
311 views

Pre boot authentication for Android phones [closed]

is there any way to have pre boot authentication on android phones? It would be nice if it would work with YubikeyONE's one time password mode.
1
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1answer
51 views

Web app with iframe and user - how to deal with session?

We have application which will be in iframe. Partner sites can use our application - put iframe in their sites. Partner site has users with money, who will use our application in iframe to buy items. ...
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0answers
20 views

Allowing third-party clients to authenticate with an app server

I'm working on an app that is planned to be licensed to OEMs, who would in turn offer it as a service to their users.  We would host the app server and the OEM would optionally host the app's web ...
26
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4answers
19k views

How do I secure my REST API?

In Detail here's the problem: I'm building an Android app, which consumes my REST API on the back-end. I need to build a Registration and Login API to begin with. After googling for a while, I feel ...
2
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0answers
27 views

WiFi deauthentication issue [migrated]

I would like to find a root of the WiFi issue we've got in our working environment. Few words about WiFi infrastructure We are using now Apple solution. Three brand-new access points from Apple ...
177
votes
7answers
125k views

RSA vs. DSA for SSH authentication keys

When generating SSH authentication keys on a Unix/Linux system with ssh-keygen, you're given the choice of creating a RSA or DSA key pair (using -t type). What is the difference between RSA and DSA ...
3
votes
2answers
133 views

Random token and email confirmation key of 10 chars sufficient?

I have a function that returns random unguessable keys with the following characters: a-z A-Z 0-9. I have set the key length to 10 and I am using that for my form tokens to prevent CRSF and I will be ...
2
votes
1answer
245 views

How authentication using md5 works in this ospf example?

I am trying to understand how md5 authentication works between this 2 cisco routers. The password is cisco in both routers. In the output in the field Auth Data: the hash is different in every packet. ...
2
votes
1answer
69 views

Do non-browser clients work around Gmail's 2-factor authentication?

If you use a client like mutt to access your mail, you probably know that it doesn't support 2-factor authentication. It still prompts only for a password - either your account password or, in the ...
5
votes
2answers
127 views

How can I enable opportunistic encryption for my web-site?

As per an honourable mention in an answer for « Why self-signed https is less trustworthy than unencrypted http? », it appears that there are already two post-Snowden drafts that have to ...
2
votes
1answer
117 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 ...
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2answers
327 views

Could “receive SMS online” site be a scam?

There is a site that allows you to see all SMS received by a certain set of phone numbers (owned by the site). This seems to be meant for services that require two-factor authentication using SMS, ...
5
votes
2answers
390 views

Trustworthy Android recovery image that allows rooting?

I have an unlocked but not rooted Android device (Nexus 7 2013 WiFi "flo", legitimately unlocked using fastboot oem unlock from an x86 computer). Neither adb root nor adb shell followed by su let me ...
0
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1answer
78 views

What is a AUTH-KEY in the security of the computers?

I don't know if this is the right section to post my question and if it is not I apologize. I'm studying security in computers and in particular the URL Spoofing. I understand that a form of URL ...
1
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2answers
41 views

is IPSEC Authentication between local domain hosts a part of normal behaviour in a Windows network?

I am seeing lot of IPSEC Authentication messages in eventlogs of Windows domain hosts. I was wondering if this - setting up IPSEC connections between domain workstations is a part of normal Windows ...
65
votes
5answers
6k views

How can my employer be a man-in-the-middle when I connect to Gmail? [duplicate]

I'm trying to understand SSL/TLS. What follows are a description of a scenario and a few assumptions which I hope you can confirm or refute. Question How can my employer be a man-in-the-middle when ...
1
vote
1answer
102 views

Why use an authentication token instead of the username/password per request?

The author of http://stackoverflow.com/a/477578/14731 recommends: DO NOT STORE THE PERSISTENT LOGIN COOKIE (TOKEN) IN YOUR DATABASE, ONLY A HASH OF IT! [...] use strong salted hashing (bcrypt / ...
1
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3answers
237 views

Is it good idea to rely on Mifare UID for security/authorization reasons?

Several systems rely on using UID of smart card for identification/authorization. For example database stores list of smart card UIDs and corresponding privileges. Given that today there exist cards ...
2
votes
1answer
112 views

Facebook oAuth2 for Javascript client application

When implementing Facebook login using oAuth2 (the Javascript version), I receive an access token back from the Facebook auth server. So far so good. The problem I have is that I want to implement a ...
3
votes
2answers
139 views

How to prove flyer was (not) authored by specific person?

Let's say we create a flyer in some desktop publishing software (e.g., InDesign, Illustrator), physically print it and post it somewhere. We don't want inauthentic claims of authorship. Is there a ...
2
votes
2answers
65 views

Authenticating REST API using Access Token

If you have a REST API, which when you log in from the client side, generates an access token for the client, which is then stored in local storage and used for all authentication from this point on. ...
1
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2answers
67 views

On password change in a web application, should it log users out

When a user is logged into a web-based application in multiple tabs, and changes their password should it automatically log them out of the other tabs? The use case is an account is compromised, the ...
1
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1answer
65 views

What is the point of hosting database externally?

Following the breach of avast:forum.avast.com they decided to host the database externally@id.avast.com. My question is, what is the point of hosting the database externally since when you get remote ...
1
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1answer
121 views

automatic connection from LSASS to different IPs. Is this the usual behavior?

I'm using windows 7. firefox 22. connecting through a regular residential wifi router. In the last month I've noticed that when I connect to the internet and once in a while my firewall indicates me ...
3
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4answers
143 views

Storing Old Password History and Information

Google, Facebook, Twitter, and several other services still knows the older passwords which we used on our accounts. At times, I can not reuse the same password as I have. Then with Google, if I type ...
2
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3answers
92 views

Is it possible to successfully exploit a vulnerability on a router remotely if

...its remote administration feature is locked down to a single IP/Range? If so, why? This has been an ongoing office debate for a while now, I claim that it would be possible as it is likely to be ...