Symmetric and Asymmetric encryption Flashcards
What is the definition of encryption?
The process of encoding a message so that it can be read only be the sender and the intended recipient.
How does the Caesar Cipher work?
Each letter of the alphabet is replaced by another some fixed distance along, the distance is known as the key.
What is Symmetric encryption?
Same key used to encrypt the message and decryption it. Both parties need to know the key and keep it secret.
What is Asymmetric encryption?
A different key is used to encrypt and decrypt the message.
Much more secure.
Cannot find the other key from one of the keys.
Generated in such a way that any thing encrypted with one of the keys can be decrypted with the other.
What do the two keys in Asymmetric encryption form?
Key Pairs
What are the two names of the keys in Asymmetric encryption?
Public and private.
What is the public key?
Public, can be given out and put online.
Anyone can get access to the public.
What is the private key?
What you keep secret
How does Asymmetric encryption work between two people?
1) Both parties have their own key pair
2) Public key copies are exchanged between parties
3) The other persons public key can be used to encrypt messages to be sent to them, and the other persons private key can decrypt it.
What are the advantages of Asymmetric encryption?
Only public key has to be shared
Don’t have to worry about people intercepting since it can’t be decrypted without the private key.
A message can be seen as authentic if you encrypt it with a private key and it can be decrypted with your public key.
What is a combined encryption key?
Your public key and their private key.
What are the benefits of a combined encryption key?
1) I know that no one else will be able to read my message
2) You know that no one else can read my message
3) You can be sure the message is authetnic
4) You can be sure the message hasn’t been modified
What is used to decrypt a message encrypted with a combine encryption key?
Your public key and their private key.
