Write short notes (any four):- a) Email Security; b) PGP; c) ESP; d) SET; e) S/MIME; f) Secure Socket Layer; g) Unix Password Scheme.
Subject Computer and Network Security
NU Year Set: 6.(a) Marks: 5*4 Year: 2015

Email Security:

Email security refers to the collective measures used to secure the access and content of an email account or service. It allows an individual or organization to protect the overall access to one or more email addresses/accounts.

PGP:

All email applications on this page support the OpenPGP standard either directly or with additional software. The authors of this webpage are not actively participating in the development of each of these third-party apps. No security audits have been done by us and, thus, we cannot provide any security guarantees.

ESP:

 A sizable chunk of the world's population attributes these strange events to extrasensory perception (ESP), a special sense beyond vision, hearing, smell, touch and taste. Unlike ordinary senses, ESP has virtually unlimited range, and it's experienced mainly as thoughts.

Security Socket Layer:

SSL (Secure Sockets Layer) is the standard security technology for establishing an encrypted link between a web server and a browser. This link ensures that all data passed between the web server and browsers remain private and integral. SSL is an industry standard and is used by millions of websites in the protection of their online transactions with their customers.

Unix Password Scheme:
 
Hashed passwords are widely used in UNIX like operating system. UNIX uses hashed password and salt value are used in UNIX like operating system. This password scheme is completely different from windows like an operating system. Windows uses only encryption of passwords rather than like UNIX that’s why windows have not much of powerful authentication scheme. 
 
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