Encryption Flashcards
What is encryption?
Data that is scrambled so it cannot be understood
When can data be encrypted?
When data is stored or when data is transmitted across network or internet (CAN/WAN)
What is called accessing encryption legitimately called?
Decryption
What is a ceasar cipher/what is it used for?
Ceaser cipher is used to convert messages into encrypted message - Algorithm (a set of rules) to follow.
What is a shift cipher?
Replaces letters in the alphabet by shifting along.
What is symmetric encryption?
Symmetric encryption uses a single key (private) to encrypt and decrypt.
Both the sender + recipient possess the secret encryption key.
Key is shared securely before the sender receives the message.
What is an advantage + disadvantage of symmetric encryption?
Advantage - Quick method of encryption because it only uses one key.
Disadvantage - This means the key can be intercepted.
What is asymmetric encryption?
Also known as public key cryptography.
Used 2 keys including a: public key - known to everyone and is used to encrypt the data, and a private key- known to recipient and is used to decrypt the data.
What is an advantage + disadvantage of asymmetric encryption?
Advantage- It’s a more secure method (2 keys, decryption key doesn’t have to be translated.
Disadvantage- lt takes longer to decrypt the data and requires more processing.
What is a digital certificate?
When encrypted data is required by the recipient, a digital certificate is requested by the computer from the sender.
ASYMMETRIC - In order to find the public key, digital certificates are required.
They identify the user or the server.
Contains:
-organizations name/address
-users email address
-organization who issued certificate
-users country
-users public key
What is the private key?
It’s the algorithm used to decrypt the data.
