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?

The correct answer is C. Use public key infrastructure (PKI) to encrypt the message client side using the originating user's. It is C as client side should encrypt the message using originating cert.

Submitted by salim_om· Mar 30, 2026Designing for security and compliance

Question

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?

Options

ATag messages client side with the originating user identifier and the destination user.
BEncrypt the message client side using block-based encryption with a shared key.
CUse public key infrastructure (PKI) to encrypt the message client side using the originating user's
DUse a trusted certificate authority to enable SSL connectivity between the client application and

How the community answered

(23 responses)

A
4% (1)
B
4% (1)
C
78% (18)
D
13% (3)

Explanation

It is C as client side should encrypt the message using originating cert.

Topics

#PKI#message authentication#public key encryption#non-repudiation

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