1. Ancy mariam babu
Vit university

2.  the need of multimedia secure
transmission
 need of more security
 What is cryptography…???

3.  CRYPTOGRAPHY IS THE SCIENCE
OF INFORMATION SECURITY
 The word is derived from
greek kryptos means hidden
 Cryptography includes the
techniques such as
microdotes, merging words
with images, other ways to
hide information in storage
or transit
 Objectives of cryptography
are
confidentiality
integrity
authentication

4.  Encryption : it is the process of
converting a plain text into
(unrecognizable) cipher text.
 For strong encryption: two attributes
-confusion
-diffussion
 Decryption: it is the process of
changing back the cipher text to
plain text.

7.  A single common key is used for encode and decode
of messages
 Both sender and receiver must know the common
key
 The common key need to be exchange before hand
by some other secure method
 Symmetric key encryption is fast and simple
 But the key management is impractical

9.  Two different key is used for
encryption and decryption
 Public key is used for encryption and
private key is used for decryption
 Each user has a public key and
corresponding private key.

11.  Encryption is the
process of converting
plain text into cipher
text.
 Done by using
encryption
algorithms
 Key is used
 Two types:
-Asymmetric
-symmetric

14.  Authentication
-protects personal data such as
passwords
 Privacy
-provides for confidentiality of private
information
 Integraty
-ensures that a document or file not has
been altered.
 Accountability
- prevents denial or plagarism

15.  Web browser encryption
 Email encryption
 Hard drive encryption
 Operating system protection

16.  Encryption on video
 Twotypes
- independent encryption
-joint compression and encryption

17.  Both encryption and compression done
seperatly
 Any compression standard can use for
compression
 For encryption, can use either
lightweight encription
or
heavyweight encryption

19.  Video encryption
technique
 Huge computation
overhead
 More secure

20.  Examples
 Des:
- data encryption standard for electronic
encryption
-short key length and symmetric key block
cipher
 Aes:
-advanced encryption algorithm
- symmetric key encryption
 Rsa:
-public key scheme
- difficulty for factoring large number
-secure

21.  Video encryption
technique
 Faster and simple
 Less complexity
 Less time cosumption

22.  examples
 Rc6
 Idea
 hb2
 Present
 Tea

23.  Both encryption and compression integrates as a
single step
 System obtain multiple level of security
 Exaples
1.vea
2.rvea
 Two types
1.compression before encryption
2. compression after encryption