Published Paper Details:

One of the most popular ways to protect data secrecy in many real-world applications, such as cloud-based data storage systems, is using encryption technologies. However, the production of encrypted data in a largely "static" format may obstruct further data processing. For computation or other purposes, encrypted data might need to be "converted" into another format. The idea of encryptions witching was first put up for conversion, namely between Paillier and ElGamal encryptions, in order to allow encryption to be employed in another device equipped with a different encryption mechanism. The conversion between traditional identity-based and attribute-based encryptions is taken into consideration in this research, and it also makes a concrete construction suggestion using the proxy re-encryption technique. In the standard model, it is demonstrated that the design is CPA secure under the q-decisional parallel bilinear Diffie-Hellman exponent assumption. The performance comparisons show that, especially when the client's data is encrypted and outsourced to a distant cloud, our bridging technique lowers compute and communication costs on the client side. In practise, it is acceptable to incur the computational overhead associated with re-encryption (on the server side) and decryption (on the client side).