Information Security

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Information Security

  1. 1. CRYPTOLOGY CRYPTOGRAPHY CRYPTANALYSIS
  2. 2. General Model of CRYPTOGRAPHIC SYSTEM
  3. 3. Types of ENCRYPTION SYMMETRIC Encryption ASYMMETRIC Encryption
  4. 4. Dear Ali I have received the new Dear Ali I have received the new
  5. 5. Asymmetric Key Encryption
  6. 6. Secrecy Authenticity
  7. 7. Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols which are designed to provide communication security over the Internet. They use X.509 certificates and hence asymmetric cryptography to assure the counterparty with whom they are communicating, and to exchange a symmetric key. Several versions of the protocols are in widespread use in applications such as Web Browsing Email Instant Faxing Instant messaging Voice-over-IP (VoIP)
  8. 8. Types of Steganography Pure Secret Key Public Key
  9. 9. Reduces the difficulty in key shar i ng. Doesn’t pr ovi de bet t er secur i t y because i t i s easy t o ext r act t he message i f t he unaut hor i zed per son knows t he embeddi ng met hod.
  10. 10. Pr ovi des bet t er secur i t y compar ed t o Pur e St eganogr aphy Di f f i cul t y i n shar i ng t he secr et key. I f t he at t acker knows t he key i t wi l l be easi er t o decr ypt and access or i gi nal i nf or mat i on.

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