Cryptography Basics Ali Sadhik Shaik [email_address] Edith Cowan University; Risk and Security Management .

Why Cryptography? Security Ali Sadhik, Edith Cowan University E-business

Security

Ali Sadhik, Edith Cowan University Technical Aspects of security is cryptography Encrypting data against disclosure, Modification Signing data against modification, Repudiation

Technical Aspects of security is cryptography

Encrypting data against disclosure, Modification

Signing data against modification, Repudiation

If the confidentiality or accuracy of your information is of any value at all, it should be protected to an appropriate level. If the unauthorized disclosure or alteration of the information could result in any negative impact, it should be secured. Ali Sadhik, Edith Cowan University

If the confidentiality or accuracy of your information is of any value at all, it should be protected to an appropriate level.

If the unauthorized disclosure or alteration of the information could result in any negative impact, it should be secured.

Generic way Ali Sadhik, Edith Cowan University

Cryptography terms Encryption: A process by which a plaintext is converted to cyphertext using a key Decryption: A process by which cyphertext is converted to plaintext. Plaintext: data. Ali Sadhik, Edith Cowan University

Encryption: A process by which a plaintext is converted to cyphertext using a key

Decryption: A process by which cyphertext is converted to plaintext.

Plaintext: data.

Encryption Operations Common Ciphers Vernam Cipher (one-time Pad) Running Key Cipher Symmetric Encryption Data Encryption Standard (DES) Triple DES Advanced Encryption Standard (AES) Asymmetric Encryption Ali Sadhik, Edith Cowan University

Common Ciphers

Vernam Cipher (one-time Pad)

Running Key Cipher

Symmetric Encryption

Data Encryption Standard (DES)

Triple DES

Advanced Encryption Standard (AES)

Asymmetric Encryption

Reference: “ Management of Information Security” Whitman, M E & Mattord, H J. Ali Sadhik, Edith Cowan University

“ Management of Information Security”

Whitman, M E & Mattord, H J.