computer science

Internet Security Association and Key Management Protocol

Internet Security Association and Key Management Protocol is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Internet Security Association and Key Management Protocol rather than just read about it. In short: Internet Security Association and Key Management Protocol (ISAKMP) is a protocol defined by RFC 2408 for establishing security association (SA) and cryptographic keys in an Internet environment. ISAKMP only provides a framework for authentication and key exchange and is designed to be key exchange independent; protocols such as Internet Key Exchange (IKE) and Kerberized Internet Negotiation of Keys (KINK) provide au…

Key takeaways

Internet Security Association and Key Management Protocol belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Internet Security Association and Key Management Protocol to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Internet Security Association and Key Management Protocol from memory before moving on to harder problems.

Reference excerpt

Internet Security Association and Key Management Protocol (ISAKMP) is a protocol defined by RFC 2408 for establishing security association (SA) and cryptographic keys in an Internet environment. ISAKMP only provides a framework for authentication and key exchange and is designed to be key exchange independent; protocols such as Internet Key Exchange (IKE) and Kerberized Internet Negotiation of Keys (KINK) provide authenticated keying material for use with ISAKMP. For example: IKE describes a protocol using part of Oakley and part of SKEME in conjunction with ISAKMP to obtain authenticated keying material for use with ISAKMP, and for other security associations such as AH and ESP for the IETF IPsec DOI.

Overview ISAKMP defines the procedures for authenticating a communicating peer, creation and management of Security Associations, key generation techniques and threat mitigation (e.g. denial of service and replay attacks). As a framework, ISAKMP typically utilizes IKE for key exchange, although other methods have been implemented such as Kerberized Internet Negotiation of Keys. A Preliminary SA is formed using this protocol; later a fresh keying is done. ISAKMP defines procedures and packet formats to establish, negotiate, modify and delete Security Associations. SAs contain all the information required for execution of various network security services, such as the IP layer services (such as header authentication and payload encapsulation), transport or application layer services or self-protection of negotiation traffic. ISAKMP defines payloads for exchanging key generation and authentication data. These formats provide a consistent framework for transferring key and authentication data which is independent of the key generation technique, encryption algorithm and authentication mechanism. ISAKMP is distinct from key exchange protocols in order to cleanly separate the details of security association management (and key management) from the details of key exchange. There may be many different key exchange protocols, each with different security properties. However, a common framework is required for agreeing to the format of SA attributes and for negotiating, modifying and deleting SAs. ISAKMP serves as this common framework. ISAKMP can be implemented over any transport protocol. All implementations must include send and receive capability for ISAKMP using UDP on port 500.

Implementation OpenBSD first implemented ISAKMP in 1998 via its isakmpd(8) software. The IPsec Services Service in Microsoft Windows handles this functionality. The KAME project implements ISAKMP for Linux and most other open source BSDs. Modern Cisco routers implement ISAKMP for VPN negotiation.

Vulnerabilities

Leaked NSA presentations released by Der Spiegel indicate that ISAKMP is being exploited in an unknown manner to decrypt IPSec traffic, as is IKE. The researchers who discovered the Logjam attack state that breaking a 1024-bit Diffie–Hellman group would break 66% of VPN servers, 18% of the top million HTTPS domains, and 26% of SSH servers, which is consistent with the leaks according to the researchers.

Worked examples

Example 1 — a first encounter with Internet Security Association and Key Management Protocol

Start with the simplest possible case. Write down what Internet Security Association and Key Management Protocol claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Internet Security Association and Key Management Protocol before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Internet Security Association and Key Management Protocol ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Internet Security Association and Key Management Protocol

In research: Internet Security Association and Key Management Protocol appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Internet Security Association and Key Management Protocol in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Internet Security Association and Key Management Protocol is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cryptographic protocols, IPsec, Key management, so understanding it makes those chapters shorter.
In everyday life: Look for Internet Security Association and Key Management Protocol outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Internet Security Association and Key Management Protocol in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Internet Security Association and Key Management Protocol means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Internet Security Association and Key Management Protocol out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Internet Security Association and Key Management Protocol in simple terms?

Why does Internet Security Association and Key Management Protocol matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Internet Security Association and Key Management Protocol?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Internet Security Association and Key Management Protocol.