Cryptography : Using Encryption Decryption Technique

Encryption technique is the translation of data into a secret code that will prevent hackers or identity thieves from being able to break or read the data that is sent across the network.

Cryptography changes the content of file in such a way that it cannot be readable while steganography hides the message in such a way that the observer does not realize that the message is exchange through the medium.

Encryption of data stored on media is used to protect the data from unauthorized access should the media ever be stolen.

There are many algorithm which are used for encryption and decryption. There are mainly three types of Encryptions :

There are two fundamental techniques used in encrypting data: i.e. symmetric encryption (also referred to as secret key encryption) and asymmetric encryption (also referred to as public key encryption.)

Abstract- The utilization of PC systems for information transmissions has made the need of security. The security of this intuitive media data should be possible with encryption or information concealing calculations. To diminish the transmission time, the information pressure is necessary. Since couple of years, an issue is to attempt to join pressure, encryption and information covering up in a solitary stride. Picture security turns out to be progressively critical for some applications, e.g., secret transmission, video reconnaissance, military and therapeutic applications. These days, the transmission of pictures is an every day routine and it is important to locate a proficient approach to transmit them over systems. They send Secret message over channel utilizing Cryptography and Steganography calculations by AES (Advanced Encryption Standard). It is utilized to scramble the information from plain content to figure content the other way around. There are two sorts of keys accessible in the cryptography, symmetric and asymmetric. There are utilizing symmetric key which is separated into two key, for example, private and open key. Open key is utilized for encryption and private key is utilized for decoding. The reversible information concealing method is utilized to recover the information and picture

This complex procedure ensures that the data is safe from being accessed by other parties[4]. Therefore, the key is an important component of the data encryption process since it is the one that makes the data into a unique cipher text that cannot be accessed by other individuals and it is also applied while decrypting the data. The key in computers is measured in bits and if an individual knows the algorithm but does not know the key, the data cannot be accessed algorithmically since the key is a major component to its being decrypted.

Digital signature and Encryption together protects data in the internet. Digital signature is the internet ID that is given to a person to identify himself that who is and how they can be trustable. They are used together to protect the data that are confidential from the intruders and threats. A digital certificate is a file on your computer a pair, you can use it to create the digital equivalent of a handwritten signature and seal of the envelope. Each file is divided into two parts: a public key and a private key. The public key is shared part; the private key is you and only you should be able to access parts. Your computer and the program learn how to share only the public part of your key so that others can see them, while still maintaining the security of your private key.

Encryption is not new or limited to Internet. It has been into practice for a very long time, in fact began thousands of years ago, however in a different format. The use of cryptography dates back to 1900 BC, in Egypt which uses mystery paintings and figures. In those days, it was not so much aimed for secrecy as it was to create mystery or amusement for literate readers. Secret messages were used by the Greek army, which

Encryption is the most effective way to provide the data security. It is a process which converts original information into a difficult-to-interpret form. The original information is known as plain text and the converted information/message is commonly known as cipher text.

Cryptography is the practice and study of techniques for secure communication in the presence of third parties called adversaries. More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, and electrical engineering. Applications of cryptography include ATM cards, computer passwords, and electronic commerce.

In today’s world when whole world become digitized there is need not only to store and transmit data but security is also main concern i.e. transmission of data with high security. In earlier time there ware attempts to hide a message in trusted media so as to deliver it across the enemy territory[1]. In the modern time of digital communication, several methods are used for hiding information in any medium. There are many method one of such technique is steganography[2] in which digital images are used as a medium for hiding secret message or information in the form of various format such as digital images, video or audio file text file. The main goal of steganography is to increase communication security by inserting secret message into the digital image by modifying the pixels of the image which are not very essential. Another most reliable method of information security is cryptography The steganography is differ from cryptography in the way that cryptography main aim is to keeping the contents of a information secret, while steganography main focuses on keeping the existence of a information secret. The science of protecting information which is mainly in the form of plain text, by transforming it (encrypting it) into an unreadable format, which is known as cipher text. Cryptography is the study of changing information from its normal, comprehensible format into an incomprehensible format, rendering it unreadable without secret knowing secret information and is mainly

Messages within its original form is named plain text or clear text. The hidden info is generally known as cipher text. The procedure for producing cipher text from plain text is named encryption. The reverse of encryption is known as decryption. While cryptographers invent clever secret codes, crypt-analysts plan to break these codes. Both these disciplines constantly make sure to keep in advance of one another. Ultimately, the successes of the cryptographers rests on the cryptography systems are likely to involve both an algorithm as well as a secret value. Here the secret value is called as key. The purpose for having a key alongside an algorithm is the idea that it can be problematic to keep devising new algorithms which allows reversible scrambling of data, and it will be hard to quickly explain a newly devised algorithm with the person you’d be willing to start communicating securely.

Cryptography is the practice and study of techniques for secure communication in the presence of third parties. The art of protecting information by transforming it (encrypting it) into an unreadable format is called cipher text.

Cryptography is the science of retaining mathematics to encrypt and decrypt data. Cryptography enables you to store sensitive data or dispatch it across insecure webs (like the Internet) so that it cannot be elucidate by anybody except the aimed recipient. Cryptography is the science of safeguarding data; cryptanalysis is the science of analyzing and obliterating safeguard communication. Classical cryptanalysis involves an interesting combination of analytical reasoning, appeal of mathematical instruments, chart discovering, patience, determination, and luck. Cryptanalysts are additionally yelled attackers. Cryptology embraces both cryptography and cryptanalysis.