a$)$ What are timing attacks, and how can they be avoided? Support your answer by

providing an example for a safe and an unsafe implementation of a function of

your choice.

$[5$ marks$]$

b$)$ You$$ve been asked by the principal of your former secondary school to help her

assessing Kerberos as a possible authentication solution for the school IT

infrastructure $($that includes both desktops$/$workstations and server resources$).$ In

your response, explain in some detail, how Kerberos works, and how it would

allow authenticating users and controlling access to the schools$$ server resources.

In your answer also comment on the security$/$robustness of Kerberos.