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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Pre-Requisites for Mutual Authentication

For Mutual Authentication, the client must contain the CA certificate of the Server and his own Certificates, and the server must contain the CA certificate of the Client and his own Certificates.In ...
36
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6answers
5k views

Is a website published in an obscure directory comparably secure to being placed behind a login? [duplicate]

Let's say I create a microsite for a client that contains confidential business information. We need to place this in a location the client can access, in order for them to approve for launch. If we ...
11
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4answers
449 views

NFC contactless payment security

This is really bugging me. Up until recently debit cards with an electronic chip were the most popular electronic form of payment available in Poland (I'd wager that in other European countries as ...
0
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1answer
122 views

Which systems in a network are able to spoof a TCP handshake?

I am reviewing for my final exam tomorrow, I came across a past exam question. An attacker wants to initiate a TCP handshake with a target to make him think E initiated it, attacker knows IP ...
16
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2answers
985 views

Is it okay to sign a PGP key without an IRL meeting?

[PGP] can get paralyzed by excessive analness. — Phil Zimmermann Preamble I am in the process of building my own web of trust. That is, I want people (PGP users…) to be—fairly—sure that, by ...
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2answers
107 views

Would my protocol be safe?

Suppose I have a protocol like the one below between users A and B; -A sends random nonce G1 to B -B sends back hash_k(G1) and random none G2 -A verifies hash_k(G1), then sends back hash_k(G1 | ...
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0answers
126 views

Client authentication with a collection of open source distributed servers

With a collection of open source distributed servers, all sharing every users data. How can the user authenticate with any server, without the passwords being compromised by a malicious server? ...
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0answers
63 views

Social game authentication exploit

We're running a popular social game and we have a security problem that is growing more and more popular these days. We have the following product requirements: There should be no registration to ...
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4answers
8k views

Are there technical disadvantages in using free ssl certificates?

Note this question is related, except this one is about free SSL certs. There are providers who are offering totally free entry-level SSL certs (like StartSSL). I was wondering if they are ...
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5answers
3k views

Is there a reason to protect SIM with PIN?

If phone would be stolen then SIM card will be thrown out by thiefs just after the theft so that they can't be found. If phone would be losed then it will be harder to find an owner for people that ...
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1answer
67 views

Secure key generation and authentication in PHP

I'm not sure how to phrase this so I'll just explain my scenario and hopefully you can help. I have to create a site that will have 50-100 students all selecting courses they would like to take for ...
44
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6answers
6k views

How do some sites (e.g. online banks) only ask for specific characters from a password without storing it as plaintext?

I thought How can a system enforce a minimum number of changed characters... would answer my question, but it seems this is a different case. When I sign on to my online banking account, I'm prompted ...
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1answer
429 views

Facebook iOS SDK Authentication

The Facebook iOS SDK only needs your bundle & app IDs of your iOS app to match those of your Facebook app. If I find out an app's app ID, can't I just create another iOS app with that app's ...
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1answer
44 views

3rd Party Authentication protocol

I have a hardware device (H), phone (P) and web server (S). I would like P to be able to send commands to H but only if it is authorized to do so. Permissions are stored on server. Technically I could ...
2
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1answer
77 views

How to implement application-specific passwords using strong hashes?

I am implementing a service where application-specific passwords seem a good choice to improve security. A question on why and when they might make sense has already been discussed here Google ...
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3answers
2k views

Login required before SQLmap

I have a multipart form data where I am suspecting one of the multipart form fields (parameter named htmlbevt_id), to be vulnerable to SQLi. To test for the same I captured the request using Burp and ...
2
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5answers
155 views

Does publishing the md5sum of a private key compromise the private key in any meaningful way?

If I have a 4096 DSA private key used for signing binaries, and I want to ensure that a partner has an identical server using the same private key, can I send the md5sum of the private keys over an ...
33
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8answers
2k views

If I include a Forgot Password service, then what's the point of using a password?

I've implemented a Forgot Password service in the following way: User goes to login page, clicks on "Forgot password?" User is presented with a form that asks for their email address. Email is sent ...
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1answer
26 views

Tomcat Client authentication

I want to make sure that my webapp is secured: I have a tomcat server - and defined the connector to use clientAuth="true". In my trust store there is only the certificate of my CA (self signed). ...
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0answers
25 views

How can I convert a domain controller account to local account for forensic analysis? [migrated]

I am doing a forensic analysis of a Windows machine that has multiple local accounts but have a domain controller or active directory account. I can analyze the files of the user because the files are ...
0
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0answers
21 views

How are the sequence numbers generated in an 802.11 frame?

An 802.11 frame consists of sequence number in it. How are these sequence numbers generated? How random is it? Do these sequence numbers follow any particular pattern for the management frames in the ...
2
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5answers
2k views

Why is client-side hashing of a password so uncommon?

There are very few websites that hash the users password before submitting it to the server. Javascript doesnt even have support for SHA or other algorithms. But I can think of quite a few advantages, ...
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3answers
138 views

Will hashing passwords in my use case improve security and why?

I am developing an application the architecture of which is arranged as follows: Session host <---> Central relay server <---> Session client All communication between the initiating ...
5
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2answers
165 views

Is Twitter digits login (sms auth code) insecure?

Twitter released(some time ago) a new kit named Digits which allows the client to login with a phone number and an authorization code (received through sms). I find it great for the user experience ...
0
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1answer
155 views

Publicly Available API + Sensitive ID/Key Transmission Over HTTP

I've run into a predicament... I'm developing a mobile application that utilizes a server for various things. One portion is that it stores an id/key pair related to accessing and processing ...
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1answer
372 views

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

I'm studying security in computers and in particular the URL Spoofing. I understand that a form of URL spoofing is phishing. Then I read that a countermeasure against phishing is the authentication ...
2
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1answer
87 views

How safe is Two Factor Authentication (TOTP)?

If someone gets my phone and saves the values my authenticator generates, will that person be able to find out the shared key, which he/she will be able to generate codes himself/herself? If so, how ...
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1answer
32 views

Would Poly1305-PBKDF2 be secure

I have a Poly1305-implementation (not Poly1305-AES) in my library. The difference: Poly1305-AES uses a key and a nonce and then uses AES to generate a one-time-key from key + nonce. This is ...
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1answer
46 views

Why should I include a client_id in an OAUTHv2 password grant request?

Like little red riding hood, you don't know who is knocking on the door... Why even bother accepting a client_id in case of a API <-> Javascript-website or API <-> Android App password grant ...
11
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0answers
788 views

MPPE-Send and Receive key derivation from MS-CHAPv2

I am trying to get the MS-MPPE-Send-key and MS-MPPE-Recv-key from the MS-CHAPv2 challenge material. I am able to follow the RFCs 2548 3078 and 3079 to the step of getting the GetNewKeyFromSHA() it is ...
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2answers
58 views

Is there any benefit to login to a website as anonymously as possible, if you've already been there from an identifiable IP address?

Here's a basic example of the situation I am in: 1.Friend downloads full-length, new release movie on shady internet site (felony). 2.Uploads it to a randomly created, cloud hosting service account ...
1
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1answer
759 views

Improving stateless REST API authentication token - or ditch it for database persistence?

I'm looking to implement stateless REST authentication into an API. I've been reading up on articles here, and have implemented an idea that works, but I was hoping to get some feedback on its ...
6
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1answer
68 views

Does iPhone home button act as Secure Attention Key?

On an iPhone, does pressing the home button act as a Secure Attention Sequence? The home button is a physical button. You can press the home button whereever you are and go back to the home screen. ...
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8answers
662 views

Biometric authentication in the real world

can anyone give a realistic estimation, based on real-world experience, of how much biometric authentication techniques are being used in the IT field?
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5answers
870 views

If someone steals my laptop while I'm logged in, how can I protect my browser?

My question has its roots in an xkcd from this week: http://xkcd.com/1200/ Isn't this true and ironic? We place so much emphasis on browser security and OS security -- and rightly so -- yet if I ...
3
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0answers
42 views

Deal with number changes in a phone number based authentication/login system

Twitter Digits (https://get.fabric.io/digits) provides an authentication/login system based on phone numbers for mobile apps, and several other mobile apps (e.g. Square Cash, ...
23
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4answers
2k views

Why do some sites block pasting into username or password input fields?

I use a few websites that prevent me from copying & pasting into the username or password fields. It's quite frustrating when using a password manager, and if anything I'd think it discourages ...
23
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2answers
1k views

What attacks, if any, are possible against Security Support Provider Interface (SSPI)?

I've been looking at SSPI recently, as it is used for authentication in a variety of Microsoft products. From the looks of it, it's based on GSSAPI and provides an abstraction for wrapping various ...
2
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2answers
79 views

token based authentication attacks

JSON Web Token seems to be a very good tool to authenticate users. But I wonder if an attacker can take the token used by another user and use it for his own attacks. And to be more precise what makes ...
42
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7answers
8k views

Should I change the default SSH port on linux servers?

Is there any advantage in changing the SSH port, I've seen people do that, but I can't seem to find the reason why. If you have a strong password and/or a certificate, is it useful for anything? ...
3
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7answers
340 views

Why not ask for a password and 2-factor token at the same time?

I have observed a number of web-based login forms that offer 2-factor authentication do token entry on a second form after validating your username and password. Is there a reason not to ask people ...
3
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3answers
214 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
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3answers
78 views

Securing a secondary login page for inputting a multi-factor auth token

I would like to implement the following use case: User lands on the login page User submits login credentials Credentials are validated and they are redirected to another page for inputting the ...
0
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2answers
422 views

Generating authentication token from PHP sessions

I have a traditional PHP site which uses sessions. I've developed a real-time app in nodejs and wish to authenticate users here based on their PHP session. The procedure would go something like this: ...
5
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3answers
370 views

Authenticating client without hardcoding key?

A basic question, but I'm not a master and this is puzzling me- How is it possible to authenticate a client from the server's perspective? i.e. imagine you're the server, and you want to give the ...
1
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1answer
49 views

Best practices for encryption from web<-> specific client

If we want to allow sensitive data between a web server and specific client only, is there anything more that can be done besides the following? Note that this is potentially a duplicate of ...
16
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2answers
11k views

Difference Between OAUTH, OpenID and OPENID Connect in very simple term?

I am very confused the difficult jargon available in web about OAUTH, OpenID and OPENID Connect. Can anyone tell me the difference in simple words.
3
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1answer
53 views

Mobile authentication with password as param in get request over ssl

I'm building out a new services layer for an existing mobile application. The mobile application authenticates with the existing services layer by providing the user name and password as url params in ...
2
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1answer
35 views

Choosing a group of symbols that contains a password

My bank employs a step in its authentication process besides [the card itself and] the regular password, where the user has a secondary password (3 small sequences of letters, such as Hy X Ba) ...
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1answer
87 views

How to attack on a web page to gain username and password? [closed]

In a situation where a web page is not using SSL and someone wants to attack to gain the username and password. How it can be done? Given the situations: Passwords are not stored in plain text. ...