Dictionary of Information Security

E

e-mail or email

use email. I ve studied the various telecom dictionaries, and they are about equally split. However, net and tech users (aside from B1FF) avoid extraneous characters (and, indeed, any extra characters at all). (If you do not know that email is electronic mail, sending text-based messages through store and forward computer network systems, you shouldn t be reading this book.)

easter egg

undocumented function in a program, generally intended as a prank on or treat for frequent users. Easter eggs range greatly in scope from mildly amusing error messages to the full implementation of a kind of flight simulator that appeared in one version of Microsoft s Excel spreadsheet program. Opinion regarding easter eggs varies, from those who see them as simply harmless jokes to those who consider the more complex inclusions to be trojan horses. In general, however, the practice of including easter eggs and other undocumented code in programs is detrimental to strict security. (OK, yes, this glossary is full of easter eggs.)

eavesdropping

passive wiretapping done secretly, without the knowledge of the originator or the intended recipients of the communication

ECB

see electronic codebook

economy of mechanism

principle that each security mechanism should be designed to be as simple as possible, so the mechanism can be correctly implemented, can be implemented in most situations, and so that it can be verified that the operation of the mechanism enforces the containing system s security policy

EICAR

European Institute of Computer Anti-Virus Research. See also EICAR Standard...

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