NETWORK SECURITY
CONFIDENTIALITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which is the principle of the encryption using a key?
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1.The key indicates which funcion is used for encryption. Thereby it is more difficult to decrypt a intercepted message as the function is unknown.
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2.The key contains the secret function for encryption including parameters. Only a password can activate the key.
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3.All functions are public, only the key is secret. It contains the parameters used for the encryption resp. decryption.
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4.The key prevents the user of having to reinstall the software at each change in technology or in the functions for encryption.
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Explanation:
Detailed explanation-1: -The public key is used to encrypt and the private key is used to decrypt.
Detailed explanation-2: -Public key encryption is also referred to as asymmetric encryption because there is not just one key used in both directions as with the symmetric encryption. In public key encryption there are two keys; whichever one is used to encrypt requires the other be used to decrypt.
Detailed explanation-3: -Public key encryption includes the following elements: Plaintext: Data that can be read and understood and is used as input for an encryption process. Ciphertext: The output of encryption in a format that is incomprehensible. Private key: A secret code typically used to decrypt encrypted messages.
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