• Meghana Harish
• Dr. Prasanna B T

: In today's digital world, computer security is crucial for everything from email transmission to financial transactions. Security is one of the most important aspects of a cloud computing system due to the fact that users' sensitive and important information is stored there. Numerous new encryption methods are developed every day, and a great deal of research is being done to find a trustworthy cryptographic algorithm. In addition to using sophisticated logic and mathematics to create secure techniques of data encryption and decryption, or getting the original data back. With the use of cryptography, a message may be sent between a sender and a recipient while remaining impenetrable to anybody listening in. We need a strong algorithm, a strong key, and a strong idea for the encryption and decryption process in order to achieve this. In this work we have used the two level of encryption and decryption process for storing the data on the multiple cloud and for downloading the data from multiple cloud. First level of encryption is done by using Rijndael Algorithm which produces the base 64 cipher text. Second level of encryption is done by using DNA sequence which take the input of Rijndael Algorithm output. Base64 cipher text is splitted and on the splitted data DNA sequence is applied which produces the cipher text. Cipher text is stored on the multiple cloud service provider. The proposed work adds two layers of security and it is difficult for an attacker to get the original data.

Multi-Cloud, Rijndael Algorithm, DNA Cryptography, Encryption, Decryption

"Dual Text Data Encryption and Decryption using Rijndael and DNA Cryptography", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 8, page no.a468-a484, August-2022, Available :http://www.jetir.org/papers/JETIR2208062.pdf

"Dual Text Data Encryption and Decryption using Rijndael and DNA Cryptography", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 8, page no. ppa468-a484, August-2022, Available at : http://www.jetir.org/papers/JETIR2208062.pdf