A description and set of rules for the ordered exchange of structured information designed with the goal of protecting the security of the system.

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Value of S and r in Fiat-Shamir Protocol [migrated]

In the book Cryptography and Network Security by Forouzan,in chapter 14, Fiat-Shamir protocol, its mentioned that two large prime numbers p and q are chosen and kept secret. However n=p*q is made ...
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1answer
18 views

Evaluation keyexchange for automation [closed]

Target: Secure communication between server S and Master M Server S executes script downloaded from Master M (securely) Problem: Small footprint - use existing software (base install of a ...
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0answers
67 views

Encryption Protocol: good or bad [closed]

reconnecting to another question (Problem with Encryption Protocol) I'd like to understand how to reason on this type of problems. First of all: we are using symmetric keys. Right? Alice encrypts ...
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0answers
17 views

Verification of implementations of security protocols

I'm interested in how an implementation of a security protocol can be verified correct and complete. The AVISPA project (http://www.avispa-project.org/) can be used to verify the protocol. I guess ...
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1answer
105 views

Is using Chromecast “a security nightmare”?

I'd like to use Chromecast on our office network. Doing so requires enabling UPnP (Universal Plug and Play). A quick search turns up statements like this: The US Department of Homeland Security ...
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1answer
53 views

What are the pros and cons (from security perspective) of stateful protocols vs stateless protocols (and vice versa)? [closed]

What are the pros and cons (from security perspective) of stateful protocols vs stateless protocols (and vice versa)?
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1answer
59 views

difference between public key and host key and security of host key

In SSH, what is the difference between host key and public key. Public key I believe that is part of private/public key pair, so, that anything sent by server(encrypted using private) can be ...
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0answers
21 views

Securing decentralised cloud scaling

Approach Require a certain percentage (quorum) of nodes to agree in order for my decentralised multicloud to grow. Benefits Reduced likelihood of growing too quickly (e.g.: 2 new nodes created ...
2
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1answer
69 views

Why does WPA2 need a 4 way handshake?

If client and AP both have the Pairwise Master Key (PMK) available, why do we need a 4 way handshake again to derive some other key (PTK)? Why can't we use PMK for further security process?
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0answers
25 views

Does Miranda-IM/Miranda-NG encrypt all messages?

Since the demise of GTalk a few weeks ago, we've found that MIM seems to be the lightest instant messaging client out there. It connects to multiple chat services (MSN, Skype, Yahoo) Our main concern ...
3
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1answer
90 views

Smart lock protocol

I made an Arduino project to lock and unlock my door via my phone (with Bluetooth). It works well but it’s unsafe since I just send the lock and unlock command in cleartext, without authentication or ...
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3answers
135 views

How to make a secure communication between two applications on the same system

I'm writing a software which is divided into two separate stand-alone pieces, one is a service like application that handles all the logics, the other one is a GUI application that just works as a ...
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1answer
46 views

Can a compromised OpenSSHD server be used to upload a malicious payload to a client?

Since I'm fairly unfamiliar with the specific details of the SSH protocol, I was wondering if it was possible for a compromised SSHd server to upload a malicious payload (like a Trojan or some other ...
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0answers
26 views

How to use reflection attack in this simple protocol?

The following mutual authentication protocol has been designed to be resilient against reflection attacks. This is done by ensuring that the challenge from the initiator looks different from the ...
22
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9answers
3k views

Why can protocols on higher layers be left unchanged?

In his answer to "How does SSL/TLS work?", Luc gives an explanation of how SSL works: SSL (and its successor, TLS) is a protocol that operates directly on top of TCP (although there are also ...
1
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1answer
65 views

What makes an SMS gateway insecure?

Is it specifically something about SMS protocol, the proprietary software used to do message routing, or perhaps an ACL on the server? I would imagine that a gateway accepting emails from anywhere ...
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0answers
26 views

TLS fallback when only one protocol is enabled

Consider I have IE with ONLY TLS 1.2 enabled. TLS 1.0 and 1.1 are disabled. (And SSLv2,v3) I have a server that only supports TLS1.2, with 1.0 and 1.1 disabled as well. Assuming they share a ...
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1answer
211 views

How does LSARPC protocol work?

I'm trying to understand how does the LSARPC protocol work internally. In particular, I would like to know how secured is it. I couldn't find anything in the internet or in different books.
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2answers
359 views

can wpa2 wifi be hacked by capturing data on an evil twin?

If I copied the wifi essid and channel and did a de-authentication to the clients of the wifi that I want to hack and started a wifi of my own with the same essid, bssid and channel and I started ...
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2answers
63 views

“Secure” drawing of lots [closed]

I want to randomly choose a game in the 50 games I have, in order to play with one of my friend. But this friend doesn't trust me, and neither do I: every time one of us pick up a game, the other ...
0
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1answer
103 views

Using OpenAppID without Snort [closed]

Cisco Security introduced open source application detection and control mechanism which called "OpenAppID". Which can be checked in the link Lets say I have a sniffer application for myself; if I ...
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5answers
118 views

Is SSL more secure than encoding?

I am writing a client / server program pair. I have established my own protocol and am communicating with TCP. Presently, when the client messages the server, it adds 42 to each byte (looping, 127 + 1 ...
43
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3answers
4k views

Is Git crowdsourcing cryptographic attacks?

A strong cryptographic hash makes collisions unlikely. Many cryptographic protocols build on that fact. But Git is using SHA-1 hashes as object identifiers. So there are a lot of already computed ...
2
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1answer
357 views

Which forward secrecy cipher suites are supported for TLS1.0 protocols?

May I know which are all forward secrecy ciphers supported in TLSv1.0 protocols?
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2answers
104 views

ISAKMP and OSI layer

I'm trying to find out on which OSI layer the ISAKMP protocol resides on? It isn't listed under the wiki's list of network protocols, and the internet says it's either on the transport, network or ...
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2answers
72 views

Is there a protocol for securely trading information between possibly uncooperating agents?

Is there a protocol or best practice for trading information between parties where one, after receiving his share of the information from the others, might refuse to answer or might alter his answer, ...
1
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0answers
77 views

Mutual Authentication Protocol based on MAC & shared secret key

I am quite unsure about how to approach this question, was wondering if anyone could give me a nudge in the right direction, I would be most appreciative! So I've learned about the 4-way handshake ...
3
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1answer
61 views

Feeding PBKDF2 to SRP verifier creation

There is an older game that solely uses UDP to communicate, and I wanted to add password authentication to the game to facilitate things like experience points and rankings. To this end, I decided to ...
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2answers
620 views

In a browser web server communication, who decides which encryption protocol to use [duplicate]

My IE browser has SSLv3.0, TLS 1.0,1.1 and 1.2 has enabled in the advanced settings. And (I was informed by my server admin) my web server can encrypt data in SSLv3.0 and TLS 1.0 Now which system ...
2
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1answer
52 views

Masking traffic in another protocol

I remember reading a couple of years ago (I believe it was during the Egyptian Revolution) that hackers managed to bypass government filters by making their traffic appear as another protocol. If ...
2
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2answers
781 views

Can Poodle be fixed in SSLv3 or will it go the way of TLS compression?

Is TLS_FALLBACK_SCSV going to be the fix for servers that wish to keep SSLv3 enabled? If not what actions are being taken, if any, that address the vulnerability besides disabling SSLv3?
3
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1answer
165 views

Is it possible to retrieve SSH v2 credentials in a username/password authentication scheme?

I'm currently analysing a compromised network(root access has been gained to a workstation and logs show that it has been used for port scanning and service brute forcing attacks on the remaining ...
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2answers
86 views

Impossible to make connections through closed ports?

If you have closed all your ports on your internet protocol, you cannot make a connection to that internet protocol. So how do attackers (DoS or any other means that need a connection) make a ...
8
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1answer
1k views

Why would HTTP client only send authentication headers once an unauthenticated request was rejected?

The default usage of HttpClient and HttpWebRequest .NET classes is setting Credentials property and then asking the class instance to perform an HTTP request. If the target requres Basic authorization ...
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1answer
134 views

What network protocol is Crashplan using?

I have been using CrashPlan for a while internally (i.e. local backup server). I would also like to setup off-site backup but my experience is that I have to forward a port from the router sitting at ...
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0answers
68 views

Payment Application Integration - Encryption or HMAC

Doing an integration with an online payment provider. Payment provider will be making a web request to my server to provide some information about the basket content. On my end there's no payment ...
0
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1answer
56 views

Basis Authentication Protocol: a concrete attack

Below is an informal protocol narration of a simple authentication protocol. A sends to B a signed hash of message M, B's name and a nonce N. B knows that the message M is intended for him, that it ...
0
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1answer
147 views

A no-login approach to authenticating a certain device, MAC-Address as password?

I have created a REST api, and now i'm thinking about authentication. I want the mobile application's flow for the user to be very simple: only having to enter a username and then this username ...
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2answers
157 views

What are the alternatives to ECDSA for an authentication protocol?

In an authentication protocol, S has a public/private key pair known to C, and S and C have established a secure channel (for example, using DH or ECDH, or any other key exchange protocol). C wishes ...
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2answers
63 views

Is it possible to implement a secure game without having a reliable arbiter?

N players are playing a perfect information game (the kind of game where everyone knows moves of everyone) by making moves by turn (P1, P2, ..., Pn, P1, ..., Pn, ... till the game will finish). Game ...
2
votes
2answers
712 views

How does the SSL connection protocol work with self-signed certificate?

I'm using the self-signed certificate, but I don't know how this protocol works. I connect two apps with a socket SSL and it works fine. The server is a Python app and the client is an Android app. I ...
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4answers
331 views

What's the need of multiple implementations of SSL/TLS? [closed]

I've been reading about SSL/TLS and I was surprised when I saw the amount SSL/TLS implementations that exist. wikipedia. So, is there really a need for all these different implementations? Wouldn't ...
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0answers
144 views

An Efficient and Secure Dynamic Auditing Protocol for Data Storage in Cloud Computing [closed]

I am doing research on this topic and have to submit research paper in my college. I've googled many times for relevant material but didn't find anything suitable. Here are some key features : ...
0
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1answer
4k views

Why is the deprecated SSL 2.0 protocol considered insecure and how can it be exploited?

I am making a presentation to the class about "SSL 2.0 deprecated protocol" and I really have no idea how this exploit is used or how the attacker can use this vul. I understand the impact of this ...
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2answers
82 views

What cryptographic protocol is appropriate for the case where user needs access to a binary and encrypted configuration files?

This is a very newbie IT security question... I have to quickly implement a solution for our application that works like this... We have a binary executable that is given a configuration file. I need ...
3
votes
1answer
190 views

How to fix this broken crypto protocol?

I am considering a protocol where you upload a one time pad to a server, using public key encryption and then the result (using the pad) is sent back in plaintext: Alice uses Bobs RSA public key to ...
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1answer
1k views

What is the different between CMP and SCEP protocol?

What is the different between CMPV and SCEP protocol? Which one is better ?
1
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1answer
79 views

Any known protocol for establishing trust between an inherently untrustworthy source and a server without a 3rd party?

Is there any kind of protocol, scheme, or theoretical paper out there that implements or examines the problem of establishing trust between two parties (communicating, listening) where the ...
2
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4answers
676 views

Are custom protocols insecure?

So, I know rolling your own security is ill-advised, but for simplistic things like communicating with a home server, say, updating a grocery list, is a custom protocol fine? It won't be doing ...
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2answers
3k views

What TLS and SSL protocols should I have turned on

I am using Explorer as my browser. What do I have to have on regarding the TLS and SSL protocols. There are several of each one.