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    Public-key cryptography / asymmetric cryptography, shared secret agreement. Alice combines her own private key with Bob's public key to create a shared secret. Likewise Bob combines his own private key with Alice's public key and gets the same shared secret. This secret is now only known by Alice and Bob. The shared secret can be used as a symmetric key for encrypted communication between Alice and Bob and for many other purposes such as MACing and to create multiple message keys etc. Diffie–Hellman key exchange is a method of this type.

    Original illustration by David Göthberg, Sweden.

    Released by David as public domain.
    Date
    Source Own work
    Author Davidgothberg
    Other versions

    This image is part in a series of images showing the four basic public-key cryptography operations: Creating a key pair, encrypting, signing, and creating a shared secret. Note that no single cryptosystem can do all three operations: For instance RSA can do encryption and signing, while Diffie–Hellman can create shared secrets.

    See Category:Cryptography diagrams for several related diagrams.
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     This W3C-invalid diagram was created with Inkscape…important.
      This diagram is translated using SVG switch elements: all translations are stored in the same file.

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    Date/TimeThumbnailDimensionsUserComment
    current17:55, 25 July 2025Thumbnail for version as of 17:55, 25 July 2025581 × 650 (35 KB)Pietzjust uploaded the previous image again because inkscape mixed up the languages
    17:11, 25 July 2025Thumbnail for version as of 17:11, 25 July 2025512 × 573 (12 KB)PietzSmoother color pallette instead of "paint brush colors" :-)
    19:33, 1 December 2024Thumbnail for version as of 19:33, 1 December 2024581 × 650 (35 KB)GKNishimotoFile uploaded using svgtranslate tool (https://svgtranslate.toolforge.org/). Added translation for pt-br.
    15:19, 7 July 2017Thumbnail for version as of 15:19, 7 July 2017581 × 650 (28 KB)Winstonleeenable chinese language
    21:02, 21 August 2006Thumbnail for version as of 21:02, 21 August 2006581 × 650 (24 KB)DavidgothbergImproved image.
    08:39, 7 August 2006Thumbnail for version as of 08:39, 7 August 2006581 × 650 (21 KB)DavidgothbergPublic-key cryptography / asymmetric cryptography, shared secret agreement. Alice combines her own secret key with Bob's public key to create a shared secret. Likewise Bob combines his own secret key with Alice's public key and gets the same shared secre

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