Php text processing by softroniics
- 1. IEEE PROJECT TOPICS & ABSTRACTS BY SOFTRONIICS SOFTONIICS WWW.SOFTRONIICS.IN CALICUT||PALAKKAD||COIMBATORE 9037061113||9037291113 ASCII Based Text Encryption and Decryption With Check For Data Integrity Abstract: Data security is of high concern when it comes to data-transfer over the network. With increased attacks on the ciphertexts, the need to improve the ciphers has increased. Not only the data but also the key used for the cryptographic process needs to be secured as all the operations needed to retransform the ciphertext back to original plaintext depend on that key. These needs have led to many new algorithms for encryption as well as for key transfer mechanisms. In this paper, a method is proposed for improving encryption using various mathematical and logical operations and providing a check for data integrity. Cryptography means writing or study of codes. It involves various techniques used to scramble the plaintext and then unscramble it to plain original form. Two most prominent encryption methods are Symmetric Encryption and Asymmetric Encryption. Encryption techniques involve use of various mathematical as well as logical functions used to make the text unreadable. Decryption usually involves reverse of encryption operations to obtain the original plaintext. 1.Asymmetric Encryption – This method makes use of two different keys. One key is used for encrypting the data and another is used for decrypting the data. Any one key from the pair can be used for encryption and the other for decryption. 2.Symmetric Encryption – This method makes use of a single key. Client and server both agree upon a key using techniques like DiffieHellman algorithm and then the communication proceeds using that key. Unlike asymmetric encryption, in this method, decryption can be done only with the key which is used for encrypting the data. 3.One Time Pad – One Time Pad, also known as OTP, is a collection of randomly generated characters which is also the only cipher known to be mathematically unbreakable. Use of OTP in any cipher techniques can help make encryption stronger and unbreakable. 4.XOR Cipher – Xor cipher uses the same known logical xor operation.Xor cipher is preferred in many complex encryption techniques over other known logical operations due to its property, which is, it has no data leakage. Use of Xor cipher is also seen in many hashing techniques for example - in the SHA-2 family. 5.Modular Arithmetic –
- 2. IEEE PROJECT TOPICS & ABSTRACTS BY SOFTRONIICS SOFTONIICS WWW.SOFTRONIICS.IN CALICUT||PALAKKAD||COIMBATORE 9037061113||9037291113 Modular arithmetic is a very well known mathematical technique which is many times used for wrapping around. In this technique, the output value obtained is always less than a predefined value, also known as modulus. PROPOSED SYSTEM The main focus of the proposed system is to increase the randomness of the generated ciphertext so that it is difficult to break the cipher. Another point on which the propsed system focuses is the way in which symmetric key is transferred. The proposed system secures transfer of such confidential data by providing a way to check the data integrity. In the propsed system, the actual key is not transferred, rather the OTP on which the operations are performed and key is generated is transferred. OTP is generated based on the stream of input characters and then a set of mathematical and logical operations are performed on it to generate a key for encryption. The same OTP is transferred along with an integer value which is result of xor of OTP, key and other used values along with a predefined constant. At receiving end, again the xor value is generated from OTP, key and other transferred values and xored with transferred xored integer value. If it gives the predefined constant then it can be made sure that -data has not been altered.