cryptography Flashcards
how does ceaser cipher encrypt?
The Caesar Cipher encrypts messages by moving the alphabet to the left or right by a certain number of places.
key
The direction and number of places moved is called the ‘Key’.
what is the key used for?
The ‘Key’ is used to decrypt the message by moving the alphabet the same number of places, but in the opposite direction.
what is a barcode?
A barcode is a series of bars and spaces that when read by a laser can be used to store details about a product.
what does barcodes use?
Barcodes use a series of numbers and a check digit to make sure the bars and spaces have not been damaged.
what info does barcodes store?
A barcode can store information such as:
Product identification
Size/weight of product
Where the product has come from
Who manufactured the product
PGP
PGP stands for ‘Pretty Good Privacy’ and it uses TWO KEYS:
A public key
A private key
two keys are assymetric…
…they are inverse each other
encryption process
raw file
encrypt file with public key
encrypted file
decryption process
encrypted file
decrypt file with private key
raw file
