Transmission Control Protocol (TCP) is a transport layer protocol that provides a connection-oriented data stream service with guaranteed, in-order delivery.

learn more… | top users | synonyms

11
votes
4answers
8k views

Is it possible to pass TCP handshake with spoofed IP address?

Little time ago, me and my friends argued if TCP handshake can be passed with a spoofed IP address. Assume I have a https web server that allows only admin's IP numbers. Can anyone connect that web ...
3
votes
3answers
7k views

FIN Attack- What is this type of attack really?

I just wanted to know what exactly is the FIN attack. I know about the FIN flag that is used to indicated the closing of a connection via TCP. But what exactly is FIN attack?
18
votes
4answers
3k views

What security mechanisms are used in BGP and why do they fail?

I just read about Indosat trying to take over the Internet by mistake. I read on a Polish infosec-related website that most of their announced routes failed to propagate, but some of them reached the ...
6
votes
1answer
184 views

Are there any situations when one can only mount a passive MITM?

This came up while discussing Web & insecure HTTP - Using RSA for encrypting passwords on the client side Is there any such situation possible when requesting an HTTP page where an attacker is ...
11
votes
4answers
3k views

Does HTTPS encryption on a site prevent the NSA from knowing you visited its domain / the URL?

The reason I ask whether HTTPS protects the metadata of your Internet activity from a wiretapping entity on the backbone like the NSA or not, is the following scenario: Say I am browsing the ...
4
votes
1answer
427 views

Security implications for two applications communicating with TCP/IP on localhost

Considering this for the local loopback connection: - It is implemented entirely within the operating system's networking software and passes no packets to any network interface controller. If ...
2
votes
3answers
5k views

Is there an alternative to TCP/IP that encrypts end-to-end?

If there was a communication protocol that encrypts at the very low-level, this would solve the problem of wiretapping entirely and for all.
7
votes
3answers
4k views

TCP Sequence Prediction and it's prominence in modern systems/networks

I have a question regarding your experience of TCP Sequence Prediction that I am hoping someone could help with. I am aware of how TCP Sequence Prediction works and how the connection can be hijacked ...
3
votes
1answer
581 views

Is it possible to force client use TCP instead UDP for DNS queries?

Assume I am managing a firewall between DNS server and clients. Is there any way to force clients use TCP rather than UDP, so we can prevent DNS spoof types of DDoS attacks?
2
votes
2answers
1k views

Firewall & TCP Traffic

I have a question regarding network firewalls and TCP traffic. When a firewall rule is set to block either inbound traffic, outbound traffic, or both on a port, does that only apply to initial ...
2
votes
1answer
117 views

Security over multi-streaming such as SCTP

I refer to multi-streaming as the ability to send two or more streams of some unit of data (block, byte streams) in one established association/context. SCTP is an example and the protocol I was ...
-5
votes
2answers
3k views

Is TCP more secure than UDP? [closed]

I am referring to confidentiality not integrity. are there any security features that UDP lack compared to TCP? According to this paragraph While TACACS uses UDP port 49, TACACS+ uses TCP port 49 ...