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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5
votes
2answers
821 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 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 ...
1
vote
0answers
40 views

Biometric device instead of password - signature security

Lets assume that there is a biometric algorithm for user authentication which compares fingerprints with an user's signature saved in database (comparing function is not important here). Next there is ...
1
vote
1answer
37 views

Detect if AES and hmac keys are invalid

I have a server which has a configured value of AES and HMAC key. The client also should have the same keys. When the client sends a request, the server interprets this request and reads the message. ...
1
vote
1answer
744 views

How does a password authentication over a TCP protocol actually work?

When coming up with a password based login protocol, many solutions come in mind: User sends password in plain text. Compute hash on Server, compare to hash in database. - Bad because attacker can ...
-1
votes
1answer
69 views
35
votes
3answers
32k views

What is ECDHE-RSA?

What is the difference between ECDHE-RSA and DHE-RSA? I know that DHE-RSA is (in one sentence) Diffie Hellman signed using RSA keys. Where DH is used for forward secrecy and RSA guards against MITM, ...
1
vote
0answers
35 views

What are the security implications of enabling a SNI-hole on a web server?

A web server (let's say Apache 2.4) implements SNI. It is configured with a 4096 bit SHA384-signed Wildcard Certificate (*.land.org) with a Subject Alternative Name (land.org). The Certificate ...
10
votes
2answers
366 views

Are there any meta-formats for crypto?

Are there are any (properly specified) meta-formats / schema formats for describing cryptographic message structures? I'm looking for a way to describe the format (where some channels might want ...
0
votes
0answers
62 views

Ensure that a file can only be decrypted after a specific condition is not present

Are there any cryptographic schemes/protocols that would allow me to encrypt a file, make it publicly available, but ensure that it can only be decrypted when a specific condition is not present (I ...
1
vote
0answers
58 views

How to decrypt a file only if specific conditions are not met [closed]

I know how to decrypt a file after one or more specific environnemental conditions are met (with secure triggers). I am interested in a cryptographic sheme that would enable decryption of data only ...
-1
votes
1answer
34 views

What is the best formal method to prove the privacy (anonymity) of a security protocol

I am studying about TOR. I require to formally verify that the involved protocols provide anonymity. However, I could not find a suitable formalism of anonymity. If there exist any ...
0
votes
1answer
15 views

How to interpet RFC data format

I'm having slight problems reading the used format in an Internet-Draft: TokenBindingProtocol#Section6 here enum { provided_token_binding(0), referred_token_binding(1), (255) } TokenBindingType; ...
1
vote
2answers
58 views

Is SSL over HIP (Host Identity Protocol) possible?

In this relatively short Host Identity Protocol (HIP) overview Host Identity Protocol: Identifier/Locator Split for Host Mobility and Multihoming it is stated Most Internet applications can run ...
63
votes
14answers
9k views

Ensure that a file can only be decrypted after a specific date

Are there any cryptographic schemes/protocols that would allow me to encrypt a file, make it publicly available, but ensure that it can only be decrypted after specific date? I assume it would be ...
2
votes
0answers
57 views

What is a 'host identity' in the 'Host Identity Protocol' (HIP)

I'm a little confused about terminology in the Host Identity Protocol (HIP) The two distinct terms Host Identity and Host Identifier are described in https://tools.ietf.org/html/rfc4423#section-3 ...
22
votes
2answers
933 views

Aviation security - Lessons to learn from PlaneSploit

A somewhat related question has already been asked (What would one need to do in order to hijack a satellite?), only at a more abstract level. Now we have a presentation by Hugo Teso from n.runs AG ...
0
votes
1answer
333 views

Is it safe not to encrypt ping packets?

I am running encrypted communication with ping tacked on after decryption and deserialization is complete. I.e. incoming data -> split into packets -> decrypt -> deserializer -> actual message or ...
0
votes
2answers
116 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 | ...
4
votes
1answer
112 views

Is there any protection against malicious devices on a CAN bus?

CAN (controller area network) is a bus used in all modern cars. You can read a lot of the cars information over this bus and I think (but I'm not too sure about this) that some critical control ...
0
votes
1answer
27 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 ...
-4
votes
2answers
234 views

Problem with Encryption Protocol

I have a question about a encryption protocol, if it is good or not. Bob and Alice communicate over an insecure channel( a possible attacker can listen). An expert suggests the following protocol to ...
1
vote
0answers
26 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 ...
1
vote
1answer
177 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 ...
-2
votes
1answer
89 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)?
2
votes
1answer
308 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 ...
0
votes
0answers
24 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
votes
1answer
106 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?
175
votes
3answers
162k views

What's the difference between SSL, TLS, and HTTPS?

I get confused with the terms in this area. What is SSL, TLS, and HTTPS? What are the differences between them?
0
votes
1answer
160 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 ...
0
votes
0answers
55 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 ...
2
votes
1answer
143 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 ...
16
votes
4answers
13k views

How do the processes for digital certificates, signatures and ssl work?

I have been trying to understand how ssl works. Instead of Alice and Bob, lets consider client and server communication. Server has a digital certificate acquired from a CA. It also has public and ...
2
votes
3answers
258 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 ...
1
vote
1answer
53 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 ...
1
vote
0answers
30 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
votes
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
vote
1answer
108 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 ...
0
votes
0answers
30 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 ...
0
votes
1answer
438 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.
1
vote
2answers
906 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 ...
1
vote
2answers
70 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 ...
43
votes
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 ...
3
votes
1answer
204 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 ...
23
votes
4answers
8k views

Preventing artificial latency or “Lag Hacking” in multiplayer games

There is an attack that some people have dubbed "lag hacking", and its gaining popularity in multiplayer games. There are at-least two ways of creating artificial latency. One method of introducing ...
-6
votes
5answers
131 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 ...
1
vote
2answers
89 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, ...
3
votes
1answer
792 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?
-1
votes
0answers
167 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 : ...
1
vote
2answers
181 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 ...
1
vote
0answers
95 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 ...