A corporation is implementing a system that necessitates a secure method for numerous users to encrypt and decrypt documents using a common key. It is imperative that the method ensures the safety of the key even when dispersed amongst an extensive user base. Which encryption approach is the most suitable for this situation?
Using a Key Agreement Protocol to establish a shared secret key among users.
Utilizing a dedicated encryption device for generating and storing keys.
Implementing asymmetric encryption utilizing distinct and separate keys.
Applying a one-way cryptographic hash function to encrypt data.
Deploying symmetric encryption with a singular shared secret key.
The challenge in this scenario is maintaining the confidentiality of the encrypting key while allowing many users to securely access and use it. Symmetric encryption often struggles with the secure distribution of the key to a large number of users, as everyone must have access to the same key. Asymmetric encryption, on the other hand, relies on public and private keys and does not suit scenarios where one common key is shared for both encrypting and decrypting. A Key Agreement Protocol like Diffie-Hellman solves this problem by allowing two parties to securely create a shared secret key, which can then be used for encryption and decryption by all authorized parties without ever transmitting the key itself.
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What is a Key Agreement Protocol?
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How does the Diffie-Hellman Key Agreement Protocol work?
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Why is symmetric encryption less suitable for large user bases?