security requirement

Question 1

why do modern systems have security?

Answer 1

internet
often control money
too much data

Question 2

4 main security issues

Answer 2

confidentiality, integrity, authentication/authorization and non repudiation and available

Question 3

What is soft security?

Answer 3

permissions

Question 4

what is hard hard security?

Answer 4

encryption

Question 5

name some approaches to integrity

Answer 5

CRC checking(easy to forge check value)
hash value (simialr problem to CRC)
hash value + secret value(key distribution problem)
best approach is hach value encrytped using asymmetric cipher.

Question 6

what is the bell-lapadula model

Answer 6

all items given a security clearance. Subject cannot read a document above their clearance level. A document cant be copied or included with another document with a lower security clearance.

Question 7

what is cucumber

Answer 7

software tool used to help write requirements which are linked directly to tests.

Question 8

what language does cucumber use?

Answer 8

gherkin