The rapid growth of internet facilities has increased the comments, posts, blogs, feedback, etc., on a large scale on social networking sites. These social media data are available in an unstructured form, which includes images, text, and videos. The processing of these data is difficult, but some sentiment analysis, information retrieval, and recommender systems are used to process these unstructured data. To extract the opinion and sentiment of internet users from their written social media text, a sentiment analysis system is required to develop, which can work on both monolingual and bilingual phonetic text. Therefore, a sentiment analysis (SA) system is developed, which performs well on different domain datasets. The system performance is tested on four different datasets and achieved better accuracy of 3% on social media datasets, 1.5% on movie reviews, 1.35% on Amazon product reviews, and 4.56% on large Amazon product reviews than the state-of-art techniques. Also, the stemmer (StemVerb) for verbs of the English language is proposed, which improves the SA system's performance.

DNA cryptography is used to encrypt message for secure communication on a network. It is a information carrier for transferring message from sender to receiver. For secure communication, it is not only to encrypt message but also necessary to hide encrypted message. DNA cryptography is also used for hiding the data, Hidden message is known by only sender and receiver. DNA computing is used to solve problems in cryptography, cryptanalysis and steganography. DNA sequences based data encryption seems to be a promising strategy for fulfilling the current information security needs. This paper focus on the comparative study of some existing works on DNA Cryptography. Message transmission is a process to transmit encrypted data through secure communication channel using DNA cryptography. Text message is encoded in DNA sequence. Message transmission process reduces the time complexity of transferring encrypted message. Bio molecular and one-time-pad technologies is used for secure message encryption.

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