You Are Designing a Mobile Chat Application

question 42

Multiple Choice

You are designing a mobile chat application. You want to ensure people cannot spoof chat messages, by providing a message were sent by a specific user. What should you do?

• A) Tag messages client side with the originating user identifier and the destination user.
• B) Encrypt the message client side using block-based encryption with a shared key.
• C) Use public key infrastructure (PKI) to encrypt the message client side using the originating user's private key.
• D) Use a trusted certificate authority to enable SSL connectivity between the client application and the server.

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Definitions:

Net Income

The amount of money remaining after all operating expenses, taxes, and other costs have been subtracted from total revenue.

Net Cash Flows

Net cash flows illustrate the amount of money being received minus the amount of money being spent by a business over a specific period, reflecting its financial health.

Investing Activities

Transactions involving the acquisition or disposal of long-term assets and other investments not classified as cash equivalents.

Dividends

Funds distributed by a company to its shareholders, typically from earnings.