Traditional system in cryptography allows just sharing of keys between the sender and receiver, for such a technique only the signature storage is provided for the user’s public key. But as the number of users increases, it’s became a challenging job to have such a certificate storage as well as key distribution, to overcome this Identity Based Encryption (IBE) was proposed, but again it had cr...

We construct an Attribute-Based Encryption (ABE) scheme that allows a user’s private key to be expressed in terms of any access formula over attributes. Previous ABE schemes were limited to expressing only monotonic access structures. We provide a proof of security for our scheme based on the Decisional Bilinear Diffie-Hellman (BDH) assumption. Furthermore, the performance of our new scheme com...

BACKGROUND Butanol is not only an important solvent and chemical intermediate in food and pharmaceutical industries, but also considered as an advanced biofuel. Recently, there have been resurging interests in producing biobutanol especially using low-cost lignocellulosic biomass, but the process still suffers from low titer and productivity. The challenge for the bioconversion approach is to f...

During pretreatment and hydrolysis of fiber-rich agricultural biomass, compounds such as salts, furfural, hydroxymethyl furfural (HMF), acetic, ferulic, glucuronic, rho-coumaric acids, and phenolic compounds are produced. Clostridium beijerinckii BA101 can utilize the individual sugars present in lignocellulosic [e.g., corn fiber, distillers dry grain solubles (DDGS), etc] hydrolysates such as ...

Attribute Based Encryption is a technique that associates user’s attributes with keys. Data is encrypted using a specific policy and only those keys whose attributes satisfy that policy are allowed to decrypt it. In this paper, we propose a secure communication model based on Ciphertext Policy Attribute Based Encryption (CP-ABE). This model allows Role Based Access Control for documents without...

Cassava constitutes an abundant substrate in tropical regions. The production of butanol in ABE fermentation by Clostridium beijerinckii BA101 using cassava flour (CF) was scaled-up to bioreactor level (5 L). Optimized fermentation conditions were applied; that is, 40℃, 60 g/l CF, and enzymatic pretreatment of the substrate. The batch fermentation profile presented an acidogenic phase for the f...

The advent of new cryptographic methods in recent years also includes schemes related to functional encryption. Within these schemes Attribute-based Encryption (ABE) became the most popular, including ciphertext-policy and key-policy ABE. ABE and related schemes are widely discussed within the mathematical community. Unfortunately, there are only a few implementations circulating within the com...

Cloud storage is used passionately for online data storage. Cipher text Policy-Attribute Based Encryption (CP-ABE) is considered as promising solution for data access control for the outsourced data stored in cloud servers as the user satisfying the access structure can only access the encrypted data. In CP-ABE, there may exist multiple user with the same decryption key hence this leads to seve...