Diffie–Hellman key exchange

E5655

cryptographic protocol key exchange protocol public-key cryptography scheme

Diffie–Hellman key exchange is a foundational cryptographic protocol that enables two parties to securely establish a shared secret over an insecure communication channel.

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All labels observed (15)

Label	Occurrences
Diffie–Hellman key exchange canonical	26
Diffie-Hellman key exchange	2
Diffie–Hellman	2
Elliptic Curve Diffie–Hellman	2
Diffie-Hellman key agreement	1
Diffie–Hellman groups	1
Diffie–Hellman key agreement	1
Elliptic-curve Diffie–Hellman	1
Key Exchange Algorithm for the Secure Shell (SSH) Transport Layer Protocol	1
ephemeral Diffie-Hellman	1
finite field Diffie–Hellman	1
finite-field Diffie-Hellman	1
finite-field Diffie–Hellman	1
static-ephemeral Diffie–Hellman	1
static-static Diffie–Hellman	1

How this entity was disambiguated

This entity first appeared as the object of triple T55531 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Diffie–Hellman key exchange
Context triple: [Whitfield Diffie, notableWork, Diffie–Hellman key exchange]

A. Whitfield Diffie
Whitfield Diffie is an American cryptographer best known as a pioneer of public-key cryptography, whose work revolutionized secure digital communication.
B. Martin Hellman
Martin Hellman is an American cryptologist best known as a co-inventor of public-key cryptography, which revolutionized secure digital communication.
C. Communication Theory of Secrecy Systems
Communication Theory of Secrecy Systems is Claude Shannon’s foundational paper that established the mathematical basis of modern cryptography and information-theoretic security.
D. TLS
TLS (Transport Layer Security) is a cryptographic protocol that secures data transmitted over networks by providing encryption, authentication, and integrity between communicating applications.
E. Wired Equivalent Privacy
Wired Equivalent Privacy (WEP) is an early and now largely obsolete Wi‑Fi security protocol known for its weak encryption and significant vulnerabilities.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Diffie–Hellman key exchange
Target entity description: Diffie–Hellman key exchange is a foundational cryptographic protocol that enables two parties to securely establish a shared secret over an insecure communication channel.

A. Whitfield Diffie
Whitfield Diffie is an American cryptographer best known as a pioneer of public-key cryptography, whose work revolutionized secure digital communication.
B. Martin Hellman
Martin Hellman is an American cryptologist best known as a co-inventor of public-key cryptography, which revolutionized secure digital communication.
C. Communication Theory of Secrecy Systems
Communication Theory of Secrecy Systems is Claude Shannon’s foundational paper that established the mathematical basis of modern cryptography and information-theoretic security.
D. Wi‑Fi Protected Access
Wi‑Fi Protected Access is a family of security protocols designed to protect wireless computer networks by providing stronger data encryption and user authentication than earlier Wi‑Fi standards.
E. TLS
TLS (Transport Layer Security) is a cryptographic protocol that secures data transmitted over networks by providing encryption, authentication, and integrity between communicating applications.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	cryptographic protocol ⓘ key exchange protocol ⓘ public-key cryptography scheme ⓘ
basedOn	discrete logarithm problem ⓘ
canBeCombinedWith	digital signatures ⓘ pre-shared public keys ⓘ public key certificates ⓘ
canProvide	perfect forward secrecy when used with ephemeral keys ⓘ
enables	agreement on a shared secret between two parties ⓘ secure key establishment over an insecure channel ⓘ
field	cryptography ⓘ information security ⓘ
hasStep	computation of a shared secret by each party ⓘ computation of public values by exponentiation ⓘ exchange of public values ⓘ generation of private keys by each party ⓘ selection of a generator of a multiplicative group ⓘ selection of a large prime modulus ⓘ
hasVariant	Elliptic-curve Diffie–Hellman ⓘ ephemeral Diffie–Hellman ⓘ finite-field Diffie–Hellman ⓘ linked to: Diffie–Hellman key exchange static Diffie–Hellman ⓘ
influenced	design of key agreement protocols ⓘ modern public-key cryptography ⓘ
introducedBy	Martin Hellman ⓘ Whitfield Diffie ⓘ
mathematicalStructure	elliptic curve group ⓘ multiplicative group modulo a prime ⓘ
notSecureAgainst	active man-in-the-middle without authentication ⓘ
property	security relies on hardness of computing discrete logarithms ⓘ symmetric shared secret is never transmitted directly ⓘ vulnerable to man-in-the-middle attacks without authentication ⓘ
publicationYear	1976 ⓘ
publishedIn	New Directions in Cryptography ⓘ
requires	authentication mechanism for protection against active attackers ⓘ
standardizedIn	NIST SP 800-56A ⓘ RFC 3526 ⓘ RFC 7919 ⓘ
threatModel	passive eavesdroppers ⓘ
usedFor	establishing symmetric encryption keys ⓘ forward secrecy in secure communication protocols ⓘ
usedIn	IPsec ⓘ PGP ⓘ Secure Shell ⓘ linked to: SSH Transport Layer Security ⓘ linked to: TLS
uses	cyclic group arithmetic ⓘ modular exponentiation ⓘ private exponents ⓘ public parameters ⓘ

How these facts were elicited

Referenced by (43)

Full triples — surface form annotated when it differs from this entity's canonical label.

Whitfield Diffie → notableWork → Diffie–Hellman key exchange ⓘ

Whitfield Diffie → coInvented → Diffie–Hellman key exchange ⓘ

TLS → supportsAlgorithmFamily → Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

TLS → supportsAlgorithmFamily → Elliptic Curve Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

Martin Hellman → knownFor → Diffie–Hellman key exchange ⓘ

Martin Hellman → coInvented → Diffie–Hellman key exchange ⓘ

Diffie–Hellman key exchange → hasVariant → finite-field Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

SSL 3.0 → supports → Diffie–Hellman key exchange ⓘ

New Directions in Cryptography → influenced → Diffie–Hellman key exchange ⓘ

New Directions in Cryptography → relatedTo → Diffie–Hellman key exchange ⓘ

Martin Hellman → knownFor → Diffie–Hellman key exchange ⓘ

subject linked to: Hellman

Martin Hellman → coInvented → Diffie–Hellman key exchange ⓘ

subject linked to: Hellman

Bailey Whitfield Diffie → coInvented → Diffie–Hellman key exchange ⓘ

subject linked to: Bailey

RFC 3526 → relatesToConcept → Diffie-Hellman key exchange ⓘ

linked to: Diffie–Hellman key exchange

RFC 7919 → usesAlgorithm → finite-field Diffie-Hellman ⓘ

linked to: Diffie–Hellman key exchange

RFC 7919 → usesAlgorithm → ephemeral Diffie-Hellman ⓘ

linked to: Diffie–Hellman key exchange

RFC 7919 → relatedTo → Diffie–Hellman key exchange ⓘ

Elliptic Curve Cryptography → includesScheme → Elliptic Curve Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

TLS 1.0 → supportsCipherSuite → Diffie–Hellman key exchange ⓘ

TLS 1.1 → supports → Diffie–Hellman key exchange ⓘ

Noise protocol framework → uses → Diffie–Hellman key exchange ⓘ

RFC 2419 → title → Key Exchange Algorithm for the Secure Shell (SSH) Transport Layer Protocol ⓘ

linked to: Diffie–Hellman key exchange

Simultaneous Authentication of Equals → uses → finite field Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

Merkle puzzles → inspired → Diffie–Hellman key exchange ⓘ

Merkle puzzles → relatedTo → Diffie–Hellman key exchange ⓘ

IKEv2 → uses → Diffie–Hellman key exchange ⓘ

Fermat's little theorem → usedIn → Diffie–Hellman key exchange ⓘ

ZRTP → basedOn → Diffie–Hellman key exchange ⓘ

ElGamal → relatedTo → Diffie–Hellman key exchange ⓘ

IKE → supports → Diffie–Hellman key exchange ⓘ

IKE → negotiates → Diffie–Hellman groups ⓘ

linked to: Diffie–Hellman key exchange

Negotiated Finite Field Diffie-Hellman Ephemeral Parameters for Transport Layer Security (TLS) → relatedTo → Diffie-Hellman key exchange ⓘ

linked to: Diffie–Hellman key exchange

OpenSSL → supportsAlgorithm → Diffie–Hellman key exchange ⓘ

OpenSSL → supportsAlgorithm → Elliptic-curve Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

Noise_IK pattern → usesOperation → Diffie-Hellman key agreement ⓘ

linked to: Diffie–Hellman key exchange

Noise protocol framework → uses → Diffie–Hellman key exchange ⓘ

subject linked to: Noise

Noise_KK pattern → uses → Diffie–Hellman key agreement ⓘ

linked to: Diffie–Hellman key exchange

Noise_KK pattern → uses → static-static Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

Noise_KK pattern → uses → static-ephemeral Diffie–Hellman ⓘ

linked to: Diffie–Hellman key exchange

Noise_XK pattern → uses → Diffie–Hellman key exchange ⓘ

Noise_XX pattern → usesOperation → Diffie–Hellman key exchange ⓘ

MTProto → usesPrimitive → Diffie–Hellman key exchange ⓘ

subject linked to: MTProto encryption protocol

MTProto → usesKeyExchange → Diffie–Hellman ⓘ

subject linked to: MTProto encryption protocol

linked to: Diffie–Hellman key exchange

All labels observed (15)

How this entity was disambiguated Show

Statements (49)

How these facts were elicited Show

Referenced by (43)

How this entity was disambiguated

How these facts were elicited