CS 5490/6490: Some Sample Questions
1. (1 point) For the purpose of encryption, an s-box in the DES mangler substitutes a 6-bit
input by a 4-bit output. This means that an output can correspond to multiple inputs. Why
is this not a problem when decrypting
School of IT, Bond University
August 5, 2009
reliably verifying the identity of someone or something
two main interesting cases
a human is identied
a computer authen
1.1).What is the OSI security architecture?
The OSI Security Architecture is a framework that provides a systematic way of defining the
requirements for security and characterizing the approaches to satisfying those requirements.