Information Security

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  • Encryption algorithms used. Then the attacks on confidentiality of the transmitted data will be prevented.
  • Using the intrusion detection systems for detection of unauthorized individuals logged onto a system and making the resources available to legitimate users.
  • Whenever the unauthorised attacks happen in the system, the security mechanisms can detect the process and the system can respond to make the data unavailable.
  • Recovery is the final approach if an attacker modifies the data or makes the data unavailable. The data can then be recovered by using backup systems, so that the integrity of the data shall not be compromised.
  • Reverse processes
  • General model of cryptographic systemData Encryption StandardsAdvanced Encryption Standards
  • Eg. Bluetooth Device pairing
  • Eg. Email
  • Eg. 9/11 Attacks used stegan.
  • Eg. Currency notes


  • 2. General Model of CRYPTOGRAPHIC SYSTEM
  • 3. Types of ENCRYPTION SYMMETRIC Encryption ASYMMETRIC Encryption
  • 4. Dear Ali I have received the new Dear Ali I have received the new
  • 5. Asymmetric Key Encryption
  • 6. Secrecy Authenticity
  • 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. Types of Steganography Pure Secret Key Public Key
  • 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. 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.