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Which of the following keys decrypts information when using asymmetric key encryption?
Public and Private key
Encryption key
Public key
Top Secret key
Private key
Private key (Secret Key) is a key which must be kept secret and is used to decrypt information from a sender. The sender uses the paired public key to encrypt the information. A fundamental rule of encryption is the algorithm doesn't need to be kept secret; however, the private key does. In an asymmetric key encryption scheme, anyone can encrypt messages using the public key, but only the holder of the paired private key can decrypt. Security depends on the secrecy of the private key. https://en.wikipedia.org/wiki/Public-key_cryptography..........
This question as written has 2 correct answers since it doesn't include which direction the encrypted information was moving. The public key decrypts what was encrypted by the private key and vice versa.
There is an implied direction, this is kind of a trick question though. Decrypting the information doesn't serve confidentiality if it can be decrypted with the Public key, only integrity, and in that case, you're just signing the information, not protecting it.
--The question asks what is needed to decrypt the message. Here, we only need the private key (of the receiver), since the message has already been encrypted with the receivers public key.
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