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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23 views

What is the different between CMP and SCEP protocol?

What is the different between CMPV and SCEP protocol? Which one is better ?
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1answer
42 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 ...
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0answers
28 views

Are there any security protocols that are redundant? [closed]

Bugs are going to happen, no matter what and are going to introduce security exploits. But, heartbleed seems to be a major threat: Certificates have to be reauthorized The exploit allows not just a ...
2
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4answers
506 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
59 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.
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2answers
50 views

What steps remain for a robust, neutral and surveillance-proof Internet? [closed]

Recent leaks about widespread NSA surveillance have brought privacy and security to the forefront of the public consciousness as we strive to determine best practices in governance for the Internet ...
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1answer
632 views

What does chacha20-poly1305@openssh.com mean for me?

OpenSSH just introduced a new protocol, chacha20-poly1305@openssh.com, which combines the two algorithms from DJB: ChaCha20 and Poly1305-AES. It was inspired by a similar proposal for TLS, which ...
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1answer
66 views

How to extract the top-level of protocols into the csv file by using tshark command?

Here is what I tried: tshark -r test.pcap -T fields -e ip.proto > output.csv But this can only show all the protocols in the csv files. I want to show only the top level of protocol numbers such as ...
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1answer
48 views

Protocols that are highly resistant to code injection attacks ? [closed]

After reading about language based security, it seems protocols that are defined using context-free or regular grammars are highly resistant to code injection attacks. Are there any good security ...
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0answers
58 views

Main difference between Yahalom and Needham-Schroeder key exchange protocols

I am just wondering what is the main difference between the Yahalom and Needham-Schroeder key exchange protocols? Which protocol uses less computational power?
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1answer
71 views

The need for created timestamp in tokens

In different token, for example SAML, I have encountered I have seen that it includes the timestamp for when it was created. I understand the reason for a expiration timestamp, but before the token is ...
2
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1answer
195 views

Using Diffie–Hellman key protocol to create a safe secret key

Let's say, I have a friend far from me and I want to send some secret messages to him. I have to say, I'm pretty newbie in security. That's why I'm wondering, does the Diffie–Hellman key exchange ...
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1answer
85 views

Two way delegation?

I am looking into using the X.509 for mutual delegation where mutual delegation is bi-directional where an entity can only delegate a task or a set of permissions to another entity if the latter is ...
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3answers
962 views

Safe to expose Active Directory via LDAPS externally?

We currently access Active Directory via LDAPS internally for authentication and user data retrieval. Is it common, or safe, to expose this publicly over LDAPs? Addendum 1: Our business case, ...
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3answers
343 views

China CCTV System UDP protocol isn't working

My boss is trying to invest on a CCTV solution that he orders from China, his idea is to market it here after we fine tune the process and configuration and make a few tweaks of our own. It consists ...
5
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1answer
1k views

What block ciphers and algorithms are now safe? [closed]

I work for a large non-US based international organisation. Regarding the recent leaks about the NSA breaking most encryption on the internet, we now know the US and UK governments are actively ...
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2answers
384 views

How do new security and cryptography techniques/protocols avoid the chicken-and-egg problem?

. . .better solutions have been proposed and will be worth considering once they have withstood the test of time (i.e. “5 to 10 years in the field, and not broken yet”). -From Thomas Pornin's ...
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1answer
131 views

xmpp ssl cipher negotiation

Does anyone know how ssl ciphers are nogitiated via the xmpp protocol. When I capture packets, I see: <starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/> There is no hello server/client or ...
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1answer
299 views

Wireshark detecting suspicious messages through jabber protocol, It says it is from my website, no idea what it is

I was doing a network scan on my computer with Wireshark and came up with something very suspicious: I found a stream with the jabber protocol. I do not have a jabber server set up nor do I have any ...
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2answers
550 views

Sending Syslog/SNMP information over the internet using standard UDP port 514

I'm looking into monitoring a Windows VPS by sending Syslog messages to a Synology NAS, which can generate email alerts and such. I also would like to use SNMP to generate health stats, and see trends ...
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1answer
123 views

Is it safe not to encrypt ping packets them?

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 ...
3
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2answers
777 views

What risks are there with a Bluetooth based door lock, and are there any mitigations?

There are a few interesting Bluetooth door locks on the market that use version Bluetooth 4.0 however there seems to be a few issues with this E0 Encryption flaws Risks during pairing Attacks ...
7
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3answers
538 views

Is off-the-record style encryption possible with email?

The instant messaging world has off-the-record encryption - which means you get authentication, encryption, and forward deniability. Key material is published after a session ends such that an ...
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0answers
21 views

Minimum protocol versions for SSL setup [duplicate]

What are the suggested minimum version of SSL/TLS supported by the major browsers (IE 8+, Chrome, Firefox, Safari, Opera,...)? Can I get rid of SSL3.0 and TLS1.0 or is there still a major user base ...
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3answers
1k views

Disabling SSL v2 and weak ciphers on client PC's

Is it a requirement to also disable SSL v2 and weak ciphers on client PC's? I have seen quite a few posts for disabling them on servers, but nothing about a regular client PC, say, running Windows XP ...
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3answers
781 views

Uploading files through an HTTPS web application

We have a client facing web site. A certificate is required to land on the login page, where upon you then need a username and a password to further login. System has Apache servers acting as load ...
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0answers
58 views

In U-Prove, what is the purpose of “Pseudonyms”, “Committed”, and “Scope” values and how are they used?

U-Prove allows for anonymous authentication and authorization without the involvement of an IdP. When a client generates a presentation proof 3 values can be optionally included, but I can't find ...
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1answer
127 views

Is there a known vetted alternative to this key-exchange protocol?

I have three participants: A client A in possession of the public key Kpub A login server S in possession of the private key Kpriv Game servers B (B1, B2 etc) S and all B may share a finite number ...
2
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1answer
214 views

Any obvious flaws in this protocol?

Are there any particular flaws in this protocol? (Yes I know about SSL) Three participants: Login Server LS Game Server GS Client C Asymmetric key-pair Kpriv Kpub Shared 128bit secret key Ksec ...
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2answers
118 views

Understanding a key establishment protocol

I'm studying a one-pass key establishment protocol. Let be A client and B the Server. A sends to B: E_w(t,b,k) where t is a timestamp requested for freshness, k is the ephemeral key that will be ...
3
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1answer
192 views

Secure information exchange between web applications using browser redirection

We're implementing a web application (US) that needs to exchange sensitive information with a third-party web application (THEM). The way we'd like it to work is that an end user clicks a hyperlink, ...
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2answers
129 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 ...
5
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5answers
2k views

How secure is using CRAM-MD5 for email authentication, when not using an SSL connection?

Background: My current server-provider tells me it's no problem to store the passwords in plain-text in the database, saying he has to do so because they use CRAM-MD5 for email authentication. My ...
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1answer
284 views

What is a man in the middle attack?

My university provided me with the following slide which is confusing me: From my understanding, what is happening here is that Trudy (Person in the middle) is pretending to be Alice. Bob then ...
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1answer
1k views

Symmetric Key Cryptography vs Public Key Cryptography [duplicate]

I understand what the two are so need to go into detail about that, however what I'm curious about is in what kind of situations would we use one over the other? It feels to me as if Public Key ...
3
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1answer
1k views

Creation and deployment of self-signed certificates for a two-machine scenario

Let us assume that I have two computers: client server Now, in the server computer, I set up a legacy ASMX web service which will going to be used by the client. Before the client can connect to ...
0
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2answers
187 views

What service could penetrate my Firewall via UDP on Port 17275?

Has anyone monitored various requests from all over the world on Port 17275 via UDP? My firewall logs show huge amounts of such requests from lots of different IP Adresses. I can't find any ...
20
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2answers
533 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 ...
5
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1answer
900 views

Why is NIST removing & not updating TLS guidance? What is the replacement?

The document NIST Special Publication 800-52 Guidelines for the Selection and Use of Transport Layer Security (TLS) Implementations was retired without superseding it with a newer document. In ...
2
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1answer
206 views

tshark - dump the data section

As the name suggests, im trying to dump the data section of the packet, man would suggest that its something like tshark -r file.pcap -t fields but im not having any luck
3
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1answer
160 views

Why should an IKE responder change the cookie secret 'frequently'?

IKEv2 has the concept of a COOKIE mode, to attempt to prevent state exhaustion from floods of initiation requests from non-existent IP addresses: Two expected attacks against IKE are state and CPU ...
21
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3answers
4k 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 ...
1
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1answer
244 views

What is the fight-back mechanism in OSPF?

I want to know more about the fight-back security mechanism in OSPF routing protocol. When is the mechanism activated and how does it work? I found the source description of OSPF fight-back, but the ...
1
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1answer
206 views

Is it safe to use flex and bison as a protocol parser?

I started writing a a simple protocol lexer and parser for STOMP using flex and bison. Does anyone know of any security issues that might result from this? Edit: Added code. %{ /* Tokenizer for ...
2
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1answer
430 views

Loki How to crack the password hash OSPF?

I have created for myself a lab of routers in GNS3 . Routing protocol between routers is OSPF. Now,by Loki penetration testing, I found that routers are the feature authentication. Using wireshark, I ...
2
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1answer
1k views

What is the significance of the version field in a TLS 1.1+ ClientHello message?

I am trying to add TLS 1.1 and 1.2 support to a packet capture product which already has TLS 1.0 support. I have used Wireshark to capture traffic between my browser and an openssl server to generate ...
10
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1answer
2k views

What changed between TLS and DTLS

What did the DTLS (TLS over UDP) authors have to change so that it could run without TCP? Bonus points: Do any of the protocol difference affect the way it should be used, both in terms of interface ...
2
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2answers
198 views

How do I correctly select and use a modern symmetric block cipher?

I have founds lots of DON'Ts with Google but so far, no simple resource that would explain to someone like me who knows that he is not smart enough get this right without help how to use correctly a ...
2
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2answers
183 views

Access via http to other protocols and ports!

Our firewall only allows HTTP port 80 but we have detected that a user accesses some other protocols and ports that we deny in our firewall. We know that he has developed an application (Console ...
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1answer
1k views

POP3S vs POP3 with STARTTLS

Can you tell me if there are any differences between POP3S and POP3 with STARTTLS? What's the safest? Are there any known attacks? If you could choose about them, which would you pick?