a) MPS staff have multiple identities associated with their different job roles. Discuss current technologies that can be used in that context to satisfy their requirements. [25 marks] b) Assume that the MPS which to strengthen user authentication at the workstation level. What role might biometric techniques play? Critically review the role of TWO named biometric techniques. You should ensure that you fully address the role of leading edge solutions (such as template free biometric technologies) in your answer. [25 marks] c) Distinguish between a biological identity and a digital identity. Illustrate your answer with specific reference to: a member of the Police Computer Crime Unit who, when not engaged in such work, engages in normal police duties. Fully describe the role of signed X.509 Digital certificates (either public or private issuance or both). [25 marks] d) Secure messaging within the MPS is critical. As an exemplar, client-server messaging involves the secure transmission of encrypted information between sender and receiver. Critically review the use of PKI (Public Key Infrastructures) in this context. Is PKI unbreakable if properly installed and operated? Should the Police "trust"cryptographic techniques (such as RSA) that are used as an integral part of PKI?