Perfect Security

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This document provides an overview of the topics covered in the course CS8792 – Cryptography and Network Security. It discusses the foundations of modern cryptography and how it provides the key to advanced computer and communication security. Modern cryptography is based on ideas from mathematics like number theory and computational complexity theory. It also discusses the differences between traditional and modern encryption techniques. The types of modern cryptography covered are symmetric key encryption and asymmetric key encryption. It defines perfect security as a cryptosystem where the ciphertext conveys no information about the plaintext. Information theory concepts like entropy and conditional probability are also introduced.

Engineering

CS8792 –
CRYPTOGRAPHY AND
NETWORK SECURITY
~ S. Janani, AP/CSE
KCET
Foundations of Modern Cryptography – Perfect

Unit I - Introduction
Topic Teaching Aid Activity
Security trends -
Legal, Ethical and Professional Aspects of Security
PPT -
Need for Security at Multiple levels, Security Policies PPT -
Model of network security,
Security attacks, services and mechanism,
OSI security architecture
PPT Quiz
Classical Encryption techniques (Symmetric cipher model, substitution
techniques, transposition techniques, steganography)
WB Worksheet
Foundations of modern cryptography: perfect security, information
theory, product cryptosystem, cryptanalysis
PPT Worksheet

Foundations of modern cryptography
 Key to advanced computer and
communication security
 completely based on the ideas of mathematics
number theory + computational complexity
theory + probability

Traditional Encryption Modern Encryption
Manipulation is done in the
characters of the plaintext
Operations are
performed on binary bit
sequence
Requires cryptosystem for
communicating Confidentiality
Securely possess secret key
Security through
obscurity
publicly known mathematical
algorithm
Secured secret key

Types of Modern Cryptography
 Symmetric key encryption - RC4, AES, DES,
Blowfish, 3DES
 Asymmetric Key Encryption - Diffie-Hellman
and RSA algorithm

Perfect Security
 ciphertext conveys no information about the
content of the plaintext

a b
k1 1 2
k2 2 3
k3 3 4
Pr[X=a] = 1/4
Pr[X=b] =3/4
Pr[K=k1] = 1/2
Pr[K=k2] = 1/4
Pr[K=k3] = 1/4

a b
k1 1 2
k2 2 3
k3 3 4
Pr [X = x | Y=y] = Pr[X=x ] Pr [y=y | X=x]
Pr[y=y]
Pr[X=a] = 1/4
Pr[X=b] =3/4
Pr[K=k1] = 1/2
Pr[K=k2] = 1/4
Pr[K=k3] = 1/4

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Transferring the secure data becomes vital for the important data of every days life. The system is a secure data transferring, combining the two techniques, Advance Encryption Standard AES and RSA. The data file is encrypted by using AES with the randomly generated key. This key is also encrypted by RSA using the receivers public key. The encrypted data file and encrypted key file are combined to form an output file to send to the receiver. The file at the receivers side is separated into two files, the encrypted data file and encrypted key file. The encrypted key file is decrypted by RSA method using the receivers private key. The AES key is acquired, the encrypted data file is then decrypted by AES method using the acquired AES key. The system includes file transferring process based on the Java socket technology. Khet Khet Khaing Oo | Yan Naung Soe "Encryption Data Measurement and Data Security of Hybrid AES and RSA Algorithm" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-6 , October 2019, URL: https://www.ijtsrd.com/papers/ijtsrd29243.pdf Paper URL: https://www.ijtsrd.com/computer-science/computer-security/29243/encryption-data-measurement-and-data-security-of-hybrid-aes-and-rsa-algorithm/khet-khet-khaing-oo

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he Wireless Sensor Networks (WSNs) have spread its roots in almost every application. Owing to their scattered nature of sensor nodes, they are more prone to attacks. There are certain applications e.g. military, where sensor data‟s confidentiality requirement during transmission is essential. Cryptography has a vital role for achieving security in WSNs.WSN has resource constraints like memory size, processing speed and energy consumption which bounds the applicability of existing cryptographic algorithms for WSN. Any good security algorithms has higher energy consumption by the nodes, so it‟s a need to choose most energy-efficient cryptographic encryption algorithms for WSNs. This paper surveys different asymmetric algorithms such as RSA, Diffie-Hellman, DSA, ECC, hybrid and DNA cryptography. These algorithms are compared based on their key size, strength, weakness, attacks and possible countermeasures in the form of table.

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Abstract— Elliptical curve cryptography (ECC) is a public key encryption technique based on elliptic curve theory that can be used to create faster, smaller, and more efficient cryptographic keys. ECC generates keys through the properties of the elliptic curve equation instead of the traditional method of generation as the product of very large prime numbers. Because ECC helps to establish equivalent security with lower computing power and battery resource usage, it is becoming widely used for mobile applications. Recently the bilinear pairing such as Weil Pairing or Tate Pairing on elliptic curves and hyper elliptic curves has been found various applications in cryptography. Several identity-based cryptosystems using bilinear pairings of elliptic curves or hyper elliptic curves were presented. Blind signature and ring signature are very useful to provide the user’s anonymity and the signer’s privacy. The proposed method focuses an ID-based ring signature scheme which is based on the pairings with elliptic curve cryptography. The proposed method is used to reduce the number of computation of the pairing for the verification of the id based signature and also decoding of the id based public key cryptosystems with authentication by factor of 2.

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AES algorithm has been stated as secure against any attack but increasing fast computing is making hackers to develop the cracks for AES as well. Therefore to further increase the security of AES, i tried to replace Standard static and fixed Substitution Box with a dynamic S Box. Dynamicity is brought with the help of Input key. Static S box is altered using the input key and the new generated s box is used for encryption. Reverse steps goes for Decryption. Presently, working on to test this design against Side Channel attacks and would publish the results here.

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Nowadays cloud computing is emerging technology which gives open resources on the internet. It is offering large amount of data to the users and distributed data over the network. Cloud computing denotes sharing of resources rather than having local servers to handle applications. It provides services to servers, storage and applications over the internet. And this cloud computing environment is used by all small and large company users. Since all the data is stored in the cloud, backing it up and restoring the same is relatively much easier than storing the same on a physical device. Cloud computing provide a convenient way to work group of people together on a common project or applications in an effective manner. there are also many factors supporting cloud computing like virtualization process, distributed storage, fast and inexpensive server, broadband internet access etc. But the major drawback is security in providing data over the internet. Each and every cloud searcher is raising a question to cloud provider that whether it contains security policies and procedures before hosting their applications. Due to poor security, there exists poor applications, data loss, hijacking, traffic etc. But the main issue is it does not have any security in distributing data. It becomes the main obstacle in cloud computing environment. So to enhance the security, so to protect the data, we proposed an algorithm called RSA algorithm. It is a new approach and it met the requirements of public key systems. By using this algorithm it will increase the data security This algorithm uses various data block size and various size keys. It has asymmetric keys for both encryption and decryption. It uses two prime numbers to generate the public and private keys. These two different keys are used for encryption and decryption purpose. This algorithm can be broadly classified in to three stages; key generation by using two prime numbers, encryption and decryption. Many cryptographic asymmetric algorithms are available to solve data security issue in cloud. Algorithms hide data from unauthorized users. Encryption Algorithms have vital role in the data security of cloud computing. Examples of such algorithms are Diffie-hellman ,ECC,DSA,RSA etc. Since Diffie-helman algorithm is not for encryption or decryption but it enable two parties who are involved in communication to generate a shared secret key for exchanging information confidentially. Elliptic Curve Cryptography (ECC) is only for smaller devices like cell phones. When Digital Signature Algorithm (DSA) is used, the process of creating the digital signature is faster than validating it. When RSA is used, the process of validating the digital signature is faster than creating it.RSA has two keys one public and the other is private, The public key is known to all, and the private key is kept secret and is mostly used in hybrid encryption schemes and digital signatures.

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Perfect Security

1. CS8792 – CRYPTOGRAPHY AND NETWORK SECURITY ~ S. Janani, AP/CSE KCET Foundations of Modern Cryptography – Perfect

2. Unit I - Introduction Topic Teaching Aid Activity Security trends - Legal, Ethical and Professional Aspects of Security PPT - Need for Security at Multiple levels, Security Policies PPT - Model of network security, Security attacks, services and mechanism, OSI security architecture PPT Quiz Classical Encryption techniques (Symmetric cipher model, substitution techniques, transposition techniques, steganography) WB Worksheet Foundations of modern cryptography: perfect security, information theory, product cryptosystem, cryptanalysis PPT Worksheet

3. Foundations of modern cryptography  Key to advanced computer and communication security  completely based on the ideas of mathematics number theory + computational complexity theory + probability

4. Traditional Encryption Modern Encryption Manipulation is done in the characters of the plaintext Operations are performed on binary bit sequence Requires cryptosystem for communicating Confidentiality Securely possess secret key Security through obscurity publicly known mathematical algorithm Secured secret key

5. Types of Modern Cryptography  Symmetric key encryption - RC4, AES, DES, Blowfish, 3DES  Asymmetric Key Encryption - Diffie-Hellman and RSA algorithm

6. Cryptography Primitives

7. Perfect Security  ciphertext conveys no information about the content of the plaintext

10.

11.

12.

13.

14.

15. a b k1 1 2 k2 2 3 k3 3 4 Pr[X=a] = 1/4 Pr[X=b] =3/4 Pr[K=k1] = 1/2 Pr[K=k2] = 1/4 Pr[K=k3] = 1/4

16. a b k1 1 2 k2 2 3 k3 3 4 Pr [X = x | Y=y] = Pr[X=x ] Pr [y=y | X=x] Pr[y=y] Pr[X=a] = 1/4 Pr[X=b] =3/4 Pr[K=k1] = 1/2 Pr[K=k2] = 1/4 Pr[K=k3] = 1/4

Perfect Security

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