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Diffie-Hellman (DH)

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Definition

Diffie-Hellman (DH)

Complete Definition

Diffie-Hellman (DH) is a public-key cryptography protocol that allows two devices to establish a shared secret over an unsecure communications channel (like ISAKMP for IPSec)

DH consists of the following options:

  • D-H Group 1 — 768-bit DH Group.
  • D-H Group 2 — 1024-bit DH Group. This group provides more security than group 1, but requires more processing time.
  • D-H Group 5 — 1536-bit DH Group. This group provides more security than group 2, but requires more processing time.

 

RFCs

  • Diffie-Hellman Key Agreement Method - RFC 2631
  • Additional Diffie-Hellman Groups for Use with IETF Standards  - RFC 5114

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