DNA Computing A Survey Researchers work on computationally intensive problems like Hamiltonian path and Traveling Salesman problem thrived the need of DNA Computing. DNA computing is a secure and efficient way to solve computationally intensive problems. 1 Now a days it is a significant area of research and technology. DNA encodes within itself huge information in a secure and efficient way hence providing a unique, robust and error free technology to the world to save any type of data. This paper discusses was specific computationally intensive problems that can be solved using DNA computing and also indicates the main and basic algorithms which are used to define the DNA computing area. 2

A Simultaneous Approach for Compression and Encryption Techniques Using Deoxyribonucleic Acid The Data Compression is a creative skill which defined scientific concepts of providing contents in a compact form. Thus, it has turned into a need in the field of communication as well as in different scientific studies. Data transmission must be sufficiently secure to be utilized in a channel medium with no misfortune; and altering of information. Encryption is the way toward scrambling an information with the goal that just the known receiver can peruse or see it. Encryption can give methods for anchoring data. Along these lines, the two strategies are the two crucial advances that required for the protected transmission of huge measure of information. In typical cases, the compacted information is encoded and transmitted. In any case, this sequential technique is time consumption and computationally cost. In the present paper, an examination on simultaneous compression and encryption technique depends on DNA which is proposed for various sorts of secret data. In simultaneous technique, both techniques can be done at single step which lessens the time for the whole task. The present work is consisting of two phases. First phase, encodes the plaintext by 6bits instead of 8bits, means each character represented by three DNA nucleotides whereas to encode any pixel of image by four DNA nucleotides. This phase can compress the plaintext by 25% of the original text. Second phase, compression and encryption has been done at the same time. Both types of data have been compressed by their half size as well as encrypted the generated symmetric key. Thus, this technique is more secure against intruders. Experimental results show a better performance of the proposed scheme compared with standard compression techniques.