what is cryptography ?
-change the readable text to non-readable text
-classes available in dotnet to implement cryptography
-encryption and decryption uses a key to perform the operation


-symmetric encryption
	-one key is used for both encryption and decryption
	-fast
	-not really safe since both party has to exchange the keys safely
-defend symmetric encryption
	-use rijndeal algorithm
	-use CBC chiper mode instead of ECB
	-do not set zeros padding
	-increase secret key lenght to 256
	-store is safely-options-windows registry,database,app config files,localfile proctected with ACL
-asymmetric encryption
	-all together 3 keys available
	-i take your public key and send you message, you take and decrypt with your private key-vice versa
-defend asymmetric encryption
	-increase keysize to atleast 2048