•Data Encryption
oGeneral concepts
refers to mathematical calculations and algorithmic schemes
that transform plaintext into cypher text, a form that is non-
readable to unauthorized parties.
oPrivate key (Symmetric) encryption
▪Exact same key (scheme) is required on
both ends of the transaction
▪To create a key that is impossible to
crack, it needs to fulfill the following
requirements:
•Random
•As large or greater than plaintext
•Never reused in whole or in part
Pros:1. Simpler algorithm than public key schemes
2. Generally faster than public key schemes
Cons: 1.Does not support large numbers of people
well.
2. How do you share a key.
oPublic key (Asymmetric) encryption
▪Encryption scheme must be defined,
however, instead of one key, you have
two
•Public (encryption) key
•Private(decryption) key
▪This scheme allows for encoding and
decoding of messages using two
different keys
•A private key and a public key
belong to one party and are
mathematically related
oThe property that has to
be maintained is that a
public key is easy to
compute, if you know a
