Cisco Cisco Web Security Appliance S690 User Guide
D I G I T A L C R Y P T O G R A P H Y T E R M S
C H A P T E R 1 0 : D E C R Y P T I O N P O L I C I E S
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Public key infrastructure (PKI)
An arrangement that binds public keys with respective user
identities by means of a certificate authority.
X.509 is a standard that is an example PKI. X.509 specifies
standards for public key certificates and an algorithm for validating
certification paths.
identities by means of a certificate authority.
X.509 is a standard that is an example PKI. X.509 specifies
standards for public key certificates and an algorithm for validating
certification paths.
Private key cryptography
A system that uses the same key for encoding and decoding text.
Because both sides of the transaction need the same key, they need
a secure way to communicate which key to use in a particular
communication session. Usually, they set up secure
communication using public key cryptography and then generate a
temporary symmetric key to use for the rest of the session.
This is also known as symmetric key cryptography.
Because both sides of the transaction need the same key, they need
a secure way to communicate which key to use in a particular
communication session. Usually, they set up secure
communication using public key cryptography and then generate a
temporary symmetric key to use for the rest of the session.
This is also known as symmetric key cryptography.
Root certificate
A certificate that is the topmost certificate in a certificate tree
structure.
All certificates below the root certificate inherit the trustworthiness
of the root certificate.
Root certificates can be unsigned public key certificates or
self-signed certificates.
structure.
All certificates below the root certificate inherit the trustworthiness
of the root certificate.
Root certificates can be unsigned public key certificates or
self-signed certificates.
Self-signed certificate
A digital certificate where the certificate authority is the same as the
certificate creator.
certificate creator.
Table 10-1 Cryptography Terms and Definitions (Continued)
Term
Definition