What is a private key? Activities that occur between two or more businesses. A data structure used to bind an authenticated individual to a public key. Provides services for an application program to ensure effective communication. The encryption key that is held privately by the user.

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Answer:

Option D; THE ENCRYPTION KEY THAT IS HELD PRIVATELY BY THE USER.

Explanation:

A private key (also known as a secret key) is used with an algorithm to encrypt and decrypt code. Secret keys are only shared with the key's generator, making it highly secure.

Private key encryption is referred to as symmetric encryption where the same private key is used for both encryption and decryption purposes.

A private key is typically a long, randomly generated number that can not be easily guessed. The length and complexity of the private key determine how feasible it is for an interloper to carry out an attack.

Therefore, a private key is THE ENCRYPTION KEY THAT IS HELD PRIVATELY BY THE USER.