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Internet Protocol Security (IPsec) is a suite of protocols for securing Internet Protocol (IP) communications by authenticating and/or encrypting each IP packet in a data stream. IPsec also includes protocols for cryptographic key establishment.

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Wikipedia about IPsec

Internet Protocol Security (IPsec) is a suite of protocols for securing Internet Protocol (IP) communications by authenticating and/or encrypting each IP packet in a data stream. IPsec also includes protocols for cryptographic key establishment.

Summary

IPsec protocols operate at the network layer, layer 3 of the OSI model. Other Internet security protocols in widespread use, such as SSL, TLS and SSH, operate from the transport layer up (OSI layers 4 - 7). This makes IPsec more flexible, as it can be used for protecting layer 4 protocols, including both TCP and UDP, the most commonly used transport layer protocols. IPsec has an advantage over SSL and other methods that operate at higher layers: an application doesn't need to be designed to use IPsec, whereas the ability to use SSL or another higher-layer protocol must be incorporated into the design of an application.

IPsec is a framework of open standards that provides data confidentiality, data integrity, and data authentication between participating peers. IPsec provides these security services at the IP layer; it uses IKE to handle negotiation of protocols and algorithms based on local policy and to generate the encryption and authentication keys to be used by IPsec. IPsec can be used to protect one or more data flows between a pair of hosts, between a pair of security gateways, or between a security gateway and a host.

The official term of "IPsec" as defined by the IETF is often wrongly written as "IPSec".

Security architecture

IPsec is implemented by a set of cryptographic protocols for:

  1. securing packet flows,
  2. mutual authentication and
  3. establishing cryptographic parameters.

The IP security architecture uses the concept of a security association as the basis for building security functions into IP. A security association is simply the bundle of algorithms and parameters (such as keys) that is being used to encrypt and authenticate a particular flow in one direction. Therefore, in normal bi-directional traffic, the flows are secured by a pair of security associations. The actual choice of encryption and authentication algorithms (from a defined list) is left to the IPsec administrator.

In order to decide what protection is to be provided for an outgoing packet, IPsec uses the Security Parameter Index (SPI), an index to the security association database (SADB), along with the destination address in a packet header, which together uniquely identify a security association for that packet. A similar procedure is performed for an incoming packet, where IPsec gathers decryption and verification keys from the security association database.

For multicast, a security association is provided for the group, and is duplicated across all authorized receivers of the group. There may be more than one security association for a group, using different SPIs, thereby allowing multiple levels and sets of security within a group. Indeed, each sender can have multiple security associations, allowing authentication, since a receiver can only know that someone knowing the keys sent the data. Note that the relevant standard does not describe how the association is chosen and duplicated across the group; it is assumed that a responsible party will have made the choice.

Search results for IPsec

NetBSD IPsec FAQ

Configuration examples: IPsec VPN. Configuration examples: Leaf-node tunnel ... Setting up IPsec manual keys and policies on bootstrap. Interaction with ipfilter ...www.netbsd.org/Documentation/network/ipsec/

Step-by-Step Guide to Internet Protocol Security (IPSec)

Notes are included on how to enable non-IPSec clients to communicate to the server. ... IPSec provides secure gateway-to-gateway connections across outsourced private ...technet.microsoft.com/en-us/library/bb742429.aspx

NIST IPsec Project

The NIST IPsec Project is concerned with providing authentication, integrity and ... Implementing IPsec requires modifications to the system's communications ...csrc.nist.gov/ipsec/

IPSec Network Security [Cisco IOS Software Releases 11.3] - Cisco Systems

IPSec Interoperability with Other Cisco IOS Software Features ... Ensure Access Lists Are Compatible with IPSec ... Crypto Access Lists at each IPSec Peer ...www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/1...

IPsec: Information from Answers.com

IPSEC is short for: Meaning Category Internet Protocol SECurity architecture Computing->Networking Internet Protocol SECurity protocolwww.answers.com/topic/ipsec

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News about IPsec

6WindGate EDS architecture

Linux DevicesThe design integrates the 6WindGate embedded Linux networking stack for multi-service IP gateways with VirtualLogix's VLX-NI virtualization technology.http://www.linuxdevices.com/news/NS3913028144.html

Learn about the World Information Security Products and Services Market

Marketwire via Yahoo! Finance Reportlinker.com announces that a new market research report related to the IT security industry is available in its catalogue.http://biz.yahoo.com/iw/081001/0439385.html

New Fujitsu Integrated Flexible WiMAX SoC Supports Femto Base Stations, and Can Scale to Pico and Micro Base Station ...

PR Newswire via Yahoo! Finance Fujitsu Microelectronics America, Inc. , a global leader in WiMAX-compliant broadband wireless technology, today announced a new Fujitsu mobile WiMAX base station SoC, a highly integrated, flexible device built using the leading-edge Fujitsu 65nm process technology.http://biz.yahoo.com/prnews/081001/aqw006.html?.v=64

Toshiba America Business Solutions Inc. Launches Its Fastest, Highest Detailed and Most Innovative Color Product ...

Centre Daily TimesToshiba America Business Solutions Inc. (TABS) announced today the immediate availability of the fastest, most advanced color multifunction product (MFP) family in the company's history with the release of the Toshiba e-STUDIO(TM)5520c/5520CT/6520c/6520CT/6530c/6530CT series. Designed and manufactured entirely in-house by Toshiba, this new line of high-speed color MFPs includes a laundry list of ....http://www.centredaily.com/business/technology/story/875291....

Rogue Security Apps Strike Again on Fortinet's Most-Reported Threats for September 2008

Marketwire via Yahoo! Finance Fortinet® -- the pioneer and leading provider of unified threat management solutions -- today announced the top 10 most reported high-risk threats for September 2008. For the second consecutive month, rogue security applications have dominated cyberspace -- this time with a vengeance -- making up 61.5 percent of total activity for September.http://biz.yahoo.com/iw/081001/0438876.html

News about Ipsec

Security and Policy Enforcement

MSDN Online DeutschlandBeginning with Windows Vista and Windows Server 2008, configurations of both Windows Firewall and Internet Protocol security (IPsec) are combined into a single tool, the Windows Firewall with Advanced Security MMC snap-in. On by default, Windows ... http://www.microsoft.com/windowsserver2008/en/us/security-po...

News - Business Tech

CNET NewsWe already have well-established ways to use encryption for authentication (i.e., Public Key Infrastructure, or PKI) and for protecting the confidentiality of data in transit (IPSec, SSL). We even have established hardware standards to support this ... http://news.cnet.com/8300-1001_3-92.html?keyword=%22Oracle%2...

Branch and Global Office

MSDN Online DeutschlandIPSec Host-to-Host Authentication Using Windows Server 2008 and Windows Vista, IPSec now supports user-level authentication known as AuthIP. AuthIP includes several benefits over the original IPSec that was included with previous versions of Windows ... http://www.microsoft.com/windowsserver2008/en/us/branch-glob...

O1 Communications Expands Service Offering with Acme Packet Net-Net ...

EarthtimesThe Net-Net 4500 Secure Services Module (SSM) provides onboard acceleration for IPsec/IKE and TLS session establishment, while configurable hardware located on the NIU provide dramatically improved encryption performance. “ Our subscriber base ... http://www.earthtimes.org/articles/show/o1-communications-ex...

Smartphone showdown: BlackBerry Storm vs. iPhone

Mac CentralThe iPhone also took a big step forward when it gained access to Cisco IPsec VPN, which Apple says will “ensure the highest level of IP-based encryption available for transmission of sensitive corporate data.” However, as some analysts have pointed ... http://www.macworld.com/article/135997/2008/10/stormvsiphone...

Search results for Ipsec

How To Configure IPSec Tunneling in Windows Server 2003

You can use IP Security (IPSec) in tunnel mode to encapsulate Internet Protocol (IP) packets and optionally encrypt them. The primary reason for using IPSec tunnel mode (sometimes ... http://support.microsoft.com/kb/816514

IPsec HOWTO

Abstract: This HowTo will cover the basic and advanced steps setting up a VPN using IPsec based on the Linux Kernels 2.6. Since there is a vast amount of documentation available ... http://www.ipsec-howto.org/t1.html

IPsec definition of IPsec in the Free Online Encyclopedia.

IP SEC urity) A security protocol from the IETF that provides authentication and encryption over the Internet. Unlike SSL, which provides services at layer 4 and secures two ... http://encyclopedia2.thefreedictionary.com/IPsec

What is IPsec? - A Word Definition From the Webopedia Computer ...

This page describes the term IPsec and lists other pages on the Web where you can find additional information.http://www.webopedia.com/TERM/I/IPsec.html

CLOSE INDIAN POINT

INDIAN POINT SAFE ENERGY COALITION (IPSEC) ACTION ALERT! We must stop the relicensing of Indian Point 2 and 3.http://www.ipsecinfo.org/
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Cisco VPN Services Adapter Video Data SheetThe Cisco VPN Services Adapter (VSA) for Cisco 7200 Series routers provides high-performance encryption and key-generation services for IP Security (IPsec) VPN applications. For...Flash - Video

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Answers for IPsec

Man4kmer

Please do you know how to use IPsec behind NAT?

Man4kmerfound something on cisco http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftipsnat.htm hope it helps
leigh j

How are SSL, IPSec and Kerberos used in securing TCP/IP implementations?

leigh jThis is the second question I have answered today that sounds like it has been lifted directly from the last page of a chapter in a network security textbook. These are three separate and distinct ...
ligmania4

How do i setup a cisco to solaris 9 ipsec tunnel ?

ligmania4Here is the fix I used when I did it. TX http://nixdoc.net/files/forum/about44213.html
MaestroMDyahho

How do I enable IPSEC passthrough (IP50, IP51) on a Win2000 computer using ICS acting as a NAT device.?

MaestroMDyahhoYou might not be able to. The reason I say this, NAT will change the headers on the packets in order to route them to the appropriate device on the network. IPSEC traffic may rejected "tampered" hea...
djosersmith

Why would IPSec be terminated at a gateway while SSL is terminated at the client PC?

djosersmithBecause the gateway is blocking IPSec for compatibility reasons, or doesn't support IPSec. Older gateways predate IPSec and don't provide any support for it - therefore, the port(s) used by IPSec are...

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