Ancy mariam babu    Vit university
 the need of multimedia secure  transmission need of more security What is cryptography…???
   CRYPTOGRAPHY IS THE SCIENCE    OF INFORMATION SECURITY   The word is derived from    greek kryptos means hidden   Cr...
 Encryption  : it is the process of  converting a plain text into  (unrecognizable) cipher text. For strong encryption: ...
   A single common key is used for encode and decode    of messages   Both sender and receiver must know the common    k...
 Two different key is used for  encryption and decryption Public key is used for encryption and  private key is used for...
   Encryption is the    process of converting    plain text into cipher    text.   Done by using    encryption    algori...
   Authentication          -protects personal data such as    passwords   Privacy           -provides for confidentialit...
 Web browser encryption Email encryption Hard drive encryption Operating system protection
   Encryption on video   Twotypes       - independent encryption        -joint compression and encryption
 Both encryption and compression done  seperatly Any compression standard can use for  compression For encryption, can ...
   Video encryption    technique   Huge computation    overhead   More secure
   Examples   Des:        - data encryption standard for electronic    encryption         -short key length and symmetri...
   Video encryption    technique   Faster and simple   Less complexity   Less time cosumption
   examples   Rc6   Idea   hb2   Present   Tea
   Both encryption and compression integrates as a    single step   System obtain multiple level of security   Exaples ...
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
Cryptography and  encryption
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Cryptography and encryption

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Cryptography and encryption

  1. 1. Ancy mariam babu Vit university
  2. 2.  the need of multimedia secure transmission need of more security What is cryptography…???
  3. 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. 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.
  5. 5.  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
  6. 6.  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.
  7. 7.  Encryption is the process of converting plain text into cipher text. Done by using encryption algorithms Key is used Two types: -Asymmetric -symmetric
  8. 8.  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
  9. 9.  Web browser encryption Email encryption Hard drive encryption Operating system protection
  10. 10.  Encryption on video Twotypes - independent encryption -joint compression and encryption
  11. 11.  Both encryption and compression done seperatly Any compression standard can use for compression For encryption, can use either lightweight encription or heavyweight encryption
  12. 12.  Video encryption technique Huge computation overhead More secure
  13. 13.  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
  14. 14.  Video encryption technique Faster and simple Less complexity Less time cosumption
  15. 15.  examples Rc6 Idea hb2 Present Tea
  16. 16.  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

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