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== IPsec == There is a scanner specifically to locate and probe [[IPsec]] security gateways, called [http://www.nta-monitor.com/tools/ike-scan/ IKE

...er a field modulo a large prime (1536 bits for one heavily used group in [[IPsec]]) or a field defined by an [[elliptic curve]]. [[Better than nothing security]], or BTNS, is basically [[IPsec]] done without authentication

...encryption devices &mdash; whether hardware encryption at link level or [[IPsec]] gateways at network level &mdash; can provide an encryption service to ma ...N | FreeS/WAN]] project, who built OE into a [[Linux]] implementation of [[IPsec]] and wrote an RFC<ref>{{citation

[[IPsec]] uses an HMAC for packet-level authentication. RFC 2104 <ref>{{cite paper

* project leader for FreeSWAN | FreeS/WAN, a Linux implementation of IPsec and opportunistic encryption

...he current version is RFC 2437. RSA is used in many protocols, including [[IPsec]], [[Open PGP]] and [[DNS security]]. ...ntations do it differently. In an [[IPsec#Complications | example]] from [[IPsec]], the [[FreeSWAN |FreeS/WAN]] implementer used the product while [[PGPnet]

'''IPsec''' (also written as IPSEC) stands for '''I'''nternet '''P'''rotocol '''Sec'''urity. It defines a basi ...ed implies that not necessarily all IPv6 systems will actually make use of IPsec, but functionality is required as specified by the [[RFC]] (RFCs serve as "

...of operation]] and how these ciphers should be used in protocols such as [[IPsec]], [[Open PGP]], [[SSL]] and [[SSH]]. For details, see the linked articles

Cipher block chaining is much the most '''widely used mode'''. [[IPsec]] specifies it as the only permitted mode. [[PGP]] and [[TLS]] use it as we Much of the work has been done in the context of Internet standards such as [[IPsec]], where it addresses a significant performance issue. See RFC 5116 "An Int

...key variant is widely used; for example RFC 2451 specifies it for use in [[IPsec]].

| url = http://www.ietf.org/rfc/rfc2890.txt}}</ref> and IPSec. The IPSec case may involve either the Authentication Header alone, or the Authenticat

...r aspect of Internet Protocol version 6 deployment may be increased use of IPsec, which, in turn, needs a secure DNS as a trusted repository for public keys ...se of client and server authentication, probably based on some features of IPsec.<ref name=RFC4301>{{citation

The [[Internet Key Exchange]] protocol automates key management for [[IPsec]]. It can be set to re-key after a fixed time or after a fixed amount of da

...s tunnel among customer sites using a secure tunneling protocol, such as [[IPSec]], over physical connections to Internet Service Providers. The ISP, in suc ...of different encrypting protocols may be used to construct a secure VPN. [[IPsec]] is most often used for secure VPNs between an organisation's offices and

...elated products appeared, PGP disk for disk encryption, PGP [[VPN]] with [[IPsec]], and PGP Firewall. However, it proved an unprofitable product for NA. In

...ent undetected. This technique is used in many security systems, such as [[IPsec]], to ensure [[information security#integrity|data integrity]]. ...very wide use. For example, it is used in protocols such as [[PGP]] and [[IPsec]] and in [[random number]] generators such as [[Intel]]'s hardware generato

...the receiver. In the [[Diffie-Hellman]] key agreement protocol, used in [[IPsec]] and other systems, public key techniques provide authentication.

...compatibility (e.g., [[Generic Route Encapsulation]]) or security (e.g., [[IPSec Tunnel Mode]]) also may do "layer 3.5". Stateful firewalls and network add

...articles. However, I feel that those citations have no direct relevance to IPsec, so citing them in this article is just clutter. ...external sources vs when to wikilink? Should we sometimes do both, as the IPsec article currently does for things like SSL and TLS?

Even systems generally thought to be secure, such as [[IPsec]] or [[PGP]], are ''trivially'' easy to subvert if the enemy has unfettered ...[[IPsec]] tunnel protects data as it travels between two offices, and the IPsec gateways are secure, an attacker with access to either office network can s