Cryptography and Data security. Design of a security system

Please answer all 3 questions.. Thank you

Post a brief explanation regarding the following issues:

• What methods/facilities are available to secure data in today's systems? Have these methods proved to be adequate? If not, what changes would you recommend to make these methods more secure?
• Why do you need message authentication? Does encryption solve the problem of message authentication? Explain.
• You are asked to design a security system for a company to ensure data protection according to the CIA triad. Discuss how you would go about beginning such an assignment and then explain what your final design should accomplish. Keep in mind cost as an issue.