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Cryptography Basics


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Cryptography Basics

  1. 1. Cryptography Basics Ali Sadhik Shaik [email_address] Edith Cowan University; Risk and Security Management .
  2. 2. Why Cryptography? <ul><li>Security </li></ul>Ali Sadhik, Edith Cowan University E-business
  3. 3. Ali Sadhik, Edith Cowan University <ul><li>Technical Aspects of security is cryptography </li></ul><ul><li>Encrypting data against disclosure, Modification </li></ul><ul><li>Signing data against modification, Repudiation </li></ul>
  4. 4. <ul><li>If the confidentiality or accuracy of your information is of any value at all, it should be protected to an appropriate level. </li></ul><ul><li>If the unauthorized disclosure or alteration of the information could result in any negative impact, it should be secured. </li></ul>Ali Sadhik, Edith Cowan University
  5. 5. Generic way Ali Sadhik, Edith Cowan University
  6. 6. Cryptography terms <ul><li>Encryption: A process by which a plaintext is converted to cyphertext using a key </li></ul><ul><li>Decryption: A process by which cyphertext is converted to plaintext. </li></ul><ul><li>Plaintext: data. </li></ul>Ali Sadhik, Edith Cowan University
  7. 7. Encryption Operations <ul><li>Common Ciphers </li></ul><ul><li>Vernam Cipher (one-time Pad) </li></ul><ul><li>Running Key Cipher </li></ul><ul><li>Symmetric Encryption </li></ul><ul><li>Data Encryption Standard (DES) </li></ul><ul><li>Triple DES </li></ul><ul><li>Advanced Encryption Standard (AES) </li></ul><ul><li>Asymmetric Encryption </li></ul>Ali Sadhik, Edith Cowan University
  8. 8. Reference: <ul><li>“ Management of Information Security” </li></ul><ul><li>Whitman, M E & Mattord, H J. </li></ul>Ali Sadhik, Edith Cowan University