Wireless Networks Encryption and Decryption
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The document is a presentation on wireless network encryption and decryption given by a group of students. It contains the following key points: 1. It discusses different types of wireless network configurations including ad-hoc and infrastructure networks. 2. It covers wireless network security goals of confidentiality, integrity and availability and different types of security attacks such as snooping, modification and denial of service. 3. It provides an overview of cryptography techniques for securing wireless networks, including symmetric and asymmetric encryption. Symmetric encryption uses a single shared key while asymmetric encryption uses public/private key pairs.
Wireless Networks Encryption and Decryption
- 1. Subject Wireless Networks Topic: Encryption & Decryption Presented By: MCS 4th Group No.1 Teacher: Dr. Faheem Khan Bacha Khan University Charsadda KPK Pakistan 1
- 2. Group Members Didar Hussain Rno.30 Adnan Khan Rno.38 Mati Ur Rehman Rno.35 Ishfaq Ahmad Rno.47 Tariq Shah Rno.51 Muhammad Javed Rno.17 Dec 2018By Didar Hussain 2
- 3. Contents Wireless communication Wireless network configuration 1. Adhoc 2. Infrastructure 3. Adhoc & infrastructure Service set Station Wireless network security Cryptography(encryption, decryption) Types of cryptography 1. Symmetric encryption 2. Asymmetric encryption Dec 2018By Didar Hussain 3
- 4. Wireless Network In wireless network all devices connect with each other wirelessly Its mean there is no cables are used in wireless networking It is to be noted that devices transmit voice and data using electromagnetic waves Dec 2018By Didar Hussain 4
- 5. Adhoc & infrastructure Dec 2018By Didar Hussain 5
- 6. Basic & Extended service set Dec 2018By Didar Hussain 6
- 7. Mobile Adhoc Networks (MANET) Ad hoc networks: Complex wireless distributed system; Nodes can freely and dynamically self-organize into arbitrary and temporary topologies; What we expect out of ad hoc networks: Provide a multi-hop communication between mobile devises; Provide coverage in areas with low population densities. Dec 2018By Didar Hussain 7
- 8. Wireless Network security We are living in the information age. We need to keep information about every aspect of our lives. In other words, information is an asset that has a value like any other asset. As an asset, information needs to be secured from attacks. To be secured, information needs to be hidden from unauthorized access (confidentiality), protected from unauthorized change (integrity), and available to an authorized entity when it is needed (availability). These are also called the security goals. Dec 2018By Didar Hussain 8
- 9. Wireless Network security Security goals • Confidentiality • Integrity • Availability Attacks Dec 2018By Didar Hussain 9
- 10. Security Attacks Snooping Snooping refers to unauthorized access to data. Traffic Analysis The hacker monitoring online traffic to understand the nature of the transmission. Modification After intercepting or accessing information, the attacker modifies the information to make it beneficial to herself. Dec 2018By Didar Hussain 10
- 11. Security Attacks Masquerading Masquerading, or spoofing, happens when the attacker impersonates somebody else. Replaying In replaying, the attacker obtains a copy of a message sent by a user and later tries to replay it. Dec 2018By Didar Hussain 11
- 12. Security Attacks Repudiation This type of attack is different from others because it is performed by one of the two parties in the communication: the sender or the receiver. The sender of the message might later deny that she has sent the message; the receiver of the message might later deny that he has received the message. Dec 2018By Didar Hussain 12
- 13. Security Attacks Denial of Service Denial of service (DoS) is a very common attack. It may slow down or totally interrupt the service of a system. The attacker can use several strategies to achieve this. She might send so many bogus requests to a server that the server crashes because of the heavy load. The attacker might intercept and delete a server’s response to a client, making the client believe that the server is not responding. The attacker may also intercept requests from the clients, causing the clients to send requests many times and overload the system. Dec 2018By Didar Hussain 13
- 14. Technique for security The main aim of security is to protect the data from an unauthorized access. So how we protect our data, its mean how we get three goals of security? There is a special technique for security of data which is called the cryptography technique. Dec 2018By Didar Hussain 14
- 15. Cryptography technique The technique which is used the encryption and decryption operations called the cryptography technique Encryption convert the original text (plain text) into an unreadable form (cipher text). Decryption convert the cipher text again to plain text The main aim of cryptography is to provide the security of data over the internet. This security can be provided by the encrypting the data into cipher text which is unknown to the intruders. Dec 2018By Didar Hussain 15
- 16. Purpose of cryptography The main purpose of cryptography is for the following four parameters- 1. Authentication: Authentication is used for the proof of the identities of sender and receiver. We use authentication to define that the origin of the message is identified and known to the receiver. 2. Integrity: Integrity is used to define that the content i.e. sent by the sender is same as the content received by the receiver. 3. Confidentiality: Confidentiality defines that the only sender and intended receiver are allowed to send the content of the message. 4. Access control: Access control specifies and controls on who can access the process. Dec 2018By Didar Hussain 16
- 17. Types of cryptography Cryptography can be divided into two main parts and these are:- 1. Symmetric key cryptography: Symmetric key cryptography can be defined as the part of cryptography in which a single key is used for both encryption and decryption process. 2. Asymmetric key cryptography: Asymmetric key cryptography can be defined as a part of cryptography in which two keys are used. One key is used for encryption process and another key is used for decryption process. Dec 2018By Didar Hussain 17
- 18. Types of cryptography Symmetric key encryption When the sender and receiver use the same key for encryption and decryption called symmetric Asymmetric key encryption When the sender and receiver use different keys for encryption and decryption called asymmetric encryption, it has further the following two types 1. Private key encryption 2. Public key encryption Dec 2018By Didar Hussain 18
- 19. Types of cryptography Private key encryption When the sender use the private key for encryption and receiver the public key for decryption called the private key encryption Public key encryption When the sender use the public key for encryption and receiver use the private key for decryption called the public key encryption Dec 2018By Didar Hussain 19
- 20. Types of cryptography Dec 2018By Didar Hussain 20 Symmetric key Cryptography Asymmetric key Cryptography Cryptography DES,AES,3DES, BLOWFISH RSA,ELLIPTIC, CURVE
- 21. Algorithm for public key encryption DES(Data Encryption Standard) 3DES(3 Data Encryption Standard) AES(Advance Encryption Standard) It is configured on any layer 3 devices such as firewall, router, multi layer switch MLS. In cryptography, the AES also known as Rijndael, is a block cipher adopted as an encryption standard by the US government specifies an encryption algorithm capable of protecting sensitive data. The AES algorithm is symmetric block cipher that can encrypt and decrypt information. The AES algorithm uses cryptographic key of 128, 192 and 256 bits to encrypt and decrypt data in blocks of 128 bits Dec 2018By Didar Hussain 21
- 22. Cryptography Process Dec 2018By Didar Hussain 22
- 23. Problems in cryptography algorithms The main problem of the cryptography algorithms are 1. Key size: - Key size is a major problem for encryption and decryption of text data. There are no criteria to decide the size of the key. Strong key make encryption strong. If the size of the key is large than the encryption and decryption process makes slow. 2. Number of Key: - Some of the algorithm used more than one key for encryption. There are no criteria to use any number of key. More number of keys create complexity and difficult to share because single key can be easily share. Dec 2018By Didar Hussain 23
- 24. Problems in cryptography algorithms 3. Selection of key:-Generally key is a numeric value which is decided by the user. Key is shared between sender and receiver. How to decide a key for encryption is also a problem. Selection of key is mostly based on algorithm are techniques used for encryption and decryption. 4. Arithmetic complexity:- Arithmetic complexity is measure in term of calculation or mathematical operation used for encryption and decryption . Complex calculation takes more time to encrypt the text. So reduce complex calculation is also a difficult problem. 5. Execution time:-Any algorithm which takes time to encrypt the text into cipher text is known as execution time. The execution time is depends on the operation used in the algorithm. Reducing execution time is also a difficult problem. Dec 2018By Didar Hussain 24
- 25. Objectives 1. Reducing Key Size: - Key size is a major problem for in encrypting and decrypting. Each and every algorithm objective is to reduce key length but key should be effective and work efficiently for text data. 2. Automatic Generation of Key: - Symmetric key based algorithm used common key shared by sender and receiver. These key are decided by the sender and same key is used by receiver in our proposed work shared key is generated automatically based on the length of the text. Dec 2018By Didar Hussain 25
- 26. Objectives 3. Reducing Arithmetic Complexity: - our objective is to reduce avoid or minimize arithmetic calculation by replacing with simple calculations. In our proposed method we use simple ASCCI code and binary number form for encrypting and simple one division. 4. Reducing Memory and Execution Time: - Each algorithm needs memory to perform calculation and storing temporary data, algorithm need time to perform calculation complex calculation needs more CPU time .Our objective to reduce memory and execution time. Dec 2018By Didar Hussain 26
- 27. Objectives 5. Minimizing Number of keys: - Each algorithm needs key to encrypt text into non readable form. Number of key is also a critical issue because more number of keys create complexity during encryption and decryption process. Some algorithm used more number of key some required less number of key. Our objective is to use minimum number of key and make strong encryption. Dec 2018By Didar Hussain 27
- 28. References Data Communications AND Networking FIFTH EDITION BEHROUZ A. FOROUZAN Singh, Swati, and Sudhir Kumar. "Analysis of Various Cryptographic Algorithms." Analysis 5.3 (2018). Goud, Amarkant, and Vijay Kumar Verma. "Data Encryption and Decryption Process Using Private Key Cryptography." International Journal 3.6 (2018). Sawant, Anil Gopal, Vilas N. Nitnaware, and Anupama A. Deshpande. "Advanced Encryption Standard Block Cipher Algorithm." (2018). Dec 2018By Didar Hussain 28
- 29. The End Thanks Dec 2018By Didar Hussain 29