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Glossary
GL-12
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
encapsulation
Wrapping of data in a particular protocol header. For example, Ethernet data is
wrapped in a specific Ethernet header before network transit. Also, when
bridging dissimilar networks, the entire frame from one network is simply
placed in the header used by the data link layer protocol of the other network.
encrypt
To crytographically produce ciphertext from plaintext.
encryption
Application of a specific algorithm to data so as to alter the appearance of the
data, making it incomprehensible to those who are not authorized to see the
information.
enrollment proxy
host
The proxy server for a certificate enrollment server.
enrollment URL
The enrollment URL is the HTTP path to a certification authority (CA) that your
Cisco IOS router should follow when sending certificate requests. The URL
includes either a DNS name or an IP address, and may be followed by a full path
to the CA scripts.
ERR
Event Risk Rating. ERR is used to control the level at which a user chooses to
take actions in an effort to minimize false positives.
ESP
Encapsulating Security Payload. An IPSec protocol that provides both data
integrity and confidentiality. Also known as Encapsulating Security Payload,
ESP provides confidentiality, data origin authentication, replay-detection,
connectionless integrity, partial sequence integrity, and limited traffic flow
confidentiality.
ESP_SEAL
ESP with the 160-bit key SEAL (Software Encryption Algorithm) encryption
algorithm. This feature was introduced in 12.3(7)T. The router must not have
hardware IPSec encryption enabled in order to use this feature.
esp-3des
ESP (Encapsulating Security Payload) transform with the 168-bit DES
encryption algorithm (3DES or Triple DES).
esp-des
ESP (Encapsulating Security Payload) transform with the 56-bit DES encryption
algorithm.
ESP-MD5-HMAC
ESP (Encapsulating Security Payload) transform using the MD5-variant SHA
authentication algorithm.