With the growth in web based applications that employ database services, SQL Injection is becoming one of the repeatedly used exploits. It permits an intruder to gain control over the database of an application, thereby able to read and modify confidential data. This paper illustrates few different forms of SQL injection and based on observation, it is seen that SQL Injection is interpreted differently on different databases. Also, an effective solution is proposed for the prevention of these categories of injection attacks. The authors suggest an approach in which the value entered for every field is checked for an SQL injection attack by parsing it through a grammar that detects SQL injection. If successfully parsed then probably, an SQL injection attack was intended. If not, the entry was legitimate and the database can be coordinated.

With the growing importance of transmitting data over the network, data encryption is becoming critical. Encryption helps safeguarding the data transmitted over the network from an unwanted entity. The two methods to encrypt data are-Substitution and Transposition. Transposition refers to changing the position of characters in a given text. On the other hand, substitution is the process of replacing each character of the plaintext with some other character. Playfair cipher is an illustration of substitution cipher. The classical playfair cipher has a 5x5 matrix. To increase the resistance of playfair cipher, this paper proposes to introduce double Myszkowski transposition on a modified 6x6 playfair matrix. The 6x6 matrix includes the all the alphabets along with the single digit numbers. A comparison with the classical 5x5 playfair cipher proves the enhanced security of the proposed algorithm.