Asymmetric encryption can provide confidentiality in two ways:
1) messages encrypted using the public key of the recipient can only be decrypted using the private key of the recipient - which only the recipient should possess.
2) It can be used as part of a negotiation process between two users to establish a temporary shared key through a process such as the following:
In this second scenario, the asymmetric encryption only facilitates the establishment of confidentiality via the eventually shared symmetric key by securing the initial negotiations.
Asymmetric encryption also known as Public key cryptography uses two keys. A private key (a secret key) and a public key. Suppose if person A sends a message to B using Asymmetric encryption.
Person A encrypts the message with B's public key. Upon receiving the message, B decrypts the message (cipher text) using his (B's) private key. When B is sending a message to A, this process is reversed. B encrypts the message with A's public key and when A receives it, A decrypts it using A's private key.
Key authentication is the process of assuring that the public key of "person A" held by "person B" does in fact belong to "person A" and vice versa.So since there is a private key which is a secret, is involved in the process, we can say it provides authentication.
Yes. Public Key encryption (or asymmetric encryption) requires a pair of keys; a public and a private key for exchanging data in a secure manner.
A public and private key
It is an encryption process that uses a public and private key pair to encrypt/decrypt data.
The asymmetric key algorithms are used to create a mathematically related key pair: a secret private keyand a published public key.
This is known as public-key cryptography, or asymmetric cryptography which is used to secure electronic communication over a network.
Yes. Public Key encryption (or asymmetric encryption) requires a pair of keys; a public and a private key for exchanging data in a secure manner.
PKI must use asymmetric encryption because it is managing the keys in many cases. This implies the use of public and private key pairs, which is asymmetric.
Mostly for performance - symmetric encryption is much much faster (order of magnitudes) than asymmetric encryption.
If you are using an encrypted channel, then at some point everyone uses symmetric encryption. It is fast (compared to asymmetric).The first part of an encrypted conversation will probably use asymmetric encryption to provide the shared private key that is later on used for the bulk part of data conversations on an encrypted channel.
Mostly for performance - symmetric encryption is much much faster (order of magnitudes) than asymmetric encryption.
Yes
Yes
A public and private key
Yes
Yes
private and primary key
Yes