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Public Keys: Dr. Khair Eddin Sabri

The document discusses different methods for distributing public keys, including public announcement, public key directories, public key authorities, and public key certificates. Public announcement allows users to distribute keys openly but is vulnerable to forgery. Directories provide greater security but can still be tampered with. Public key authorities improve security by controlling key distribution through a directory but require users to know the authority's public key. Public key certificates bind identities to keys through digital signatures and can be verified by anyone who knows the certificate authority's public key.

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Salma
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75 views9 pages

Public Keys: Dr. Khair Eddin Sabri

The document discusses different methods for distributing public keys, including public announcement, public key directories, public key authorities, and public key certificates. Public announcement allows users to distribute keys openly but is vulnerable to forgery. Directories provide greater security but can still be tampered with. Public key authorities improve security by controlling key distribution through a directory but require users to know the authority's public key. Public key certificates bind identities to keys through digital signatures and can be verified by anyone who knows the certificate authority's public key.

Uploaded by

Salma
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Public Keys

Dr. K. Sabri

Outline

Public Keys

Dr. Khair Eddin Sabri

Department of Computer Science, The University of Jordan


Amman, Jordan

Dr. K. Sabri Public Keys


Public Keys Distribution of Public Keys

Public Keys
Public keys can be distributed by one of the following
Dr. K. Sabri
methods
Outline
Public announcement

Public-key directory

Public-key authority

Public-key certificates

Dr. K. Sabri Public Keys


Public Keys Public Announcement

Public Keys

Dr. K. Sabri

Outline

Users distribute public keys to recipients or broadcast


to community at large

Major weakness is forgery

Dr. K. Sabri Public Keys


Public Keys Public Key Directory

Public Keys

Dr. K. Sabri

Outline

Can obtain greater security by registering keys with a


public directory

Still vulnerable to tampering or forgery

Dr. K. Sabri Public Keys


Public Keys Public Key Authority

Public Keys
Improve security by tightening control over distribution Dr. K. Sabri
of keys from directory
Outline

Requires users to know public key for the directory

Requires users to know public key for the directory

Users interact with directory to obtain any desired


public key securely

Dr. K. Sabri Public Keys


Public Keys Public Key Authority

Public Keys

Dr. K. Sabri

Outline

Dr. K. Sabri Public Keys


Public Keys Public-Key Certificates

Public Keys
Certificates allow key exchange without real-time
Dr. K. Sabri
access to public-key authority
Outline

A certificate binds identity to public key.

All contents are signed by a trusted Public-Key or


Certificate Authority (CA)

Can be verified by anyone who knows the public-key


authorities public-key
Dr. K. Sabri Public Keys
Public Keys Public-Key Certificates

Public Keys

Dr. K. Sabri

Outline

Dr. K. Sabri Public Keys


Public Keys

Dr. K. Sabri

Outline

Dr. K. Sabri Public Keys

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