Information Security Cryptography ( L01- introduction )
2 likes964 views
The document serves as an introduction to cryptography, detailing its historical context, definitions, and key goals such as confidentiality, integrity, and availability. It explains the processes of encryption and decryption and highlights the importance of cryptographic keys, distinguishing between public and private keys. The document sets the stage for further discussion on types of encryption in subsequent sections.
Information Security Cryptography ( L01- introduction )
- 2. outline Historically What is cryptography Cryptography goals Cryptography sections ● Encryption ● Decryption Cryptography keys and their importance Types of Cryptography keys ● public Key ● private key 2
- 3. Historically Information security is the practice of defending information from unauthorized access, use, disclosure, disruption, modification, perusal, inspection, recording or destruction. It is a general term that can be used regardless of the form the data may take. Information security uses cryptography to transform usable information into a form that renders it unusable by anyone other than an authorized user; this process is called encryption. 3
- 4. What is cryptography Known as encryption codes to convert the information is understandable process , To prevent unauthorized persons from access to information or misunderstood. It uses the science of mathematics is you can store sensitive information transmitted over insecure networks and secure from hackers and vandals tamper and thieves. 4
- 5. Cryptography goals Confidentiality: keeping information secret from all but those who are authorized to see it. Integrity: ensuring information has not been altered by unauthorized or unknown means. Availability: keeping information accessible by authorized users when required 5
- 6. Cryptography goals 6 Confidentiality Availability Integrity
- 7. Cryptography sections Encryption : It is turning information into incomprehensible symbols using encryption algorithms process. It includes encryption texts, images, audio, ... The picture shows texts encryption process: 7
- 8. Cryptography sections Decryption : It is the opposite of the encryption process is the conversion of non- understood codes to understandable using Decryption algorithms process. 8
- 9. Cryptography keys and their importance What is the key? Is a secret number by the length algorithm type, for example(6-bit)it is used for the encryption and decryption process. ► What is importance ? No one can decryption data without the encryption key that has been done Encryption. 9
- 10. Types of Cryptography keys Public key : Is the number that is traded and spread among the rest of the users to encrypt any information or customized for you e-mails is a public key based encryption process nor can one decode that information else you because they need a PIN number Let it is private key to complete the calculation and access to the key figure basis and thus open the files again. 10
- 11. Types of Cryptography keys Private key : The other half is supplementing public key to get to the base figure and restore encrypted information to Normal before encryption , and this is a key characteristic of all people from other users and serve as an electronic identity enables the owner of any decryption encrypted information sent to him on the basis of the public key so you must keep the private key. 11
- 12. Example of public key In this example it is used by the public key encryption without the private key in the encryption and decryption process 12
- 13. Example of public and private key In this example is the use of encryption by the public and private key where the public key for all seen while the private key is not seen. 13
- 14. Example of public and private key In this example encryption process is done by the public key is not decryption only by the private key using the public key. 14
- 15. In this slide we have talked about the subject of encryption in general and explain the tools used in encryption .. In the (L02)we will talk about the types of encryption depending on the type of the key And some of the things. 15