What is the disadvantage of private key?

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Private key encryption has certain limitations that need to be considered.

One of the main drawbacks is that it uses the same key for both encrypting and decrypting the message. This means that the key must be securely shared between the sender and the receiver.

Sharing the key introduces a security risk, as if the key falls into the wrong hands, it can be used to decrypt all messages that were encrypted with it. This makes it crucial to ensure the safety and confidentiality of the key.

Another concern with private key encryption is that once the key is compromised, it can be difficult to revert the situation. All messages that were sent or received using that key are potentially exposed to the adversary.