One of the inherent problems with protecting a single key is that it means that only one key is used to both encode and decode the message.

Question

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When only one key is used to encode and decode the message, it becomes vulnerable to attacks such as brute force, where a hacker simply tries all possible combinations of the key until the correct one is found. Using multiple keys, such as in public key cryptography, makes it more difficult for hackers to access the message.

One of the Inherent Problems with Protecting a Single Key