Chosen-plaintext attack

This method is called a secret key, because only the two of you will have access to it. When people want to find out what their saying to each other the attack is called a chosen ciphertext attack,CCA. In cryptography, ciphertext or cyphertext is the result of encryption performed on plaintext using an algorithm, called a cipher. It is an attack model for cryptanalysis in which the cryptanalyst gathers information by choosing a ciphertext and obtaining its decryption under an unknown key. Cryptanalysis

than that of a chaotic system[S. Yanchuk et al.,2001], as a result, it is safer than chaos in security algorithm.As the hyper-chaos has larger key spaces than chaos used in some previous work such as Refs. [2,3,20], is more secure against brute force attack Image encryption algorithm based on hyper chaos Focus on security issues: This section represents some of the previous works based on hyperchaotic system. The image encryption algorithm based on hyper chaos proposed by (Tiegang Gao et al.,2007)

Encryption has become a necessity in modern society due to the nature of the information we must interact with every day. Furthermore, the encryption of computer data is becoming increasingly important since much sensitive information is stored on our hard drives and human based codes are simply too easy for a computer to solve. All forms of encryption are based on cryptology which is "the science of analyzing and deciphering codes and ciphers and cryptograms". Cryptology and simple codes have been

the above figure shown. If the plaintext and key used for encryption are both complemented, then the inputs given to the first XOR are also complemented. The output, then, is the same as for the uncomplemented inputs. Further down, we see that only one of the two inputs to the second XOR is complemented, therefore, the output is the complement of the output that would be generated by uncomplemented inputs. b. In a chosen plaintext attack, if for chosen plaintext X, the analyst can obtain Y1

private key is an image that converted into RGB numbers and the public key is random integers used to permutate the image. The location of the RGB will be used to encrypt the plaintext. The performance of this algorithm is investigated against many different attacks such as ciphertext attacks, plaintext attacks and brute force attack. The analysis and statistical tests show the strength of this algorithm. The results show that the MOL algorithm is suitable for securing wired and wireless communication

Introduction 1 Defining Security • The security of a system, application, or protocol is always relative to – A set of desired properties – An adversary with specific capabilities • For example, standard file access permissions in Linux and Windows are not effective against an adversary who can boot from a CD 2 Security Goals Integrity • C.I.A. Confidentiality Availability 3 Confidentiality • Confidentiality is the avoidance of the unauthorized disclosure of information

Techniques for privacy preserving data mining Introduction Data mining techniques provide good results only if input data is accurate. But data collected from users are often inaccurate.Users may deliberately enter inaccurate information if they are asked to provide personal information because of their worry that information may be misused by organisation to harass them. So we need to find data mining techniques that encourages the user to provide accurate information by ensuring them that data

can be dangerous because with the several hack attacks that a key can be broken. So I have proposed a new mechanism that will replace the text key with the image pixels and can gain high security which cannot be easy to break without prior knowledge. 2. Introduction For the decades to keep data secure and to convey the

and study in securing communication between parties in presence of potential adversaries. A cryptographic algorithm or cipher is a mathematical function used in a plaintext in the encryption and decryption process. A cryptographic algorithm works in combination with a key (number, word, or phrase) to encrypt the plaintext. The same plaintext also encrypts to different cipher text with the use of different keys. The core of modern cryptography is the construction and analyzation of protocols of various

1.0 Introduction Cloud computing is a virtual pool of resources and it provides these resources to users via internet. But it comes with few problems like data privacy, security and reliability etc. The most important problem in all these is security and privacy. Securing the cloud means protecting the databases. We are going to discuss about different security issues occurred in cloud and different cryptographic algorithms which are used to provide security. Due to cloud computing even though the