Non-pairing attribute based encryption scheme based on quadratic residuosity

The conventional private and public key cryptosystems suffer from issues of key exchange and key distribution respectively. A better alternative is to use identity of a user as the public key. Identity-based encryption is well accepted worldwide but its key revocation issue makes it insecure. Attribute Based Encryption, using attributes of a user instead of identity combats these issues. Though many mathematical methods are used to achieve IBE and ABE, research for efficient ones is still ongoing. This paper proposes a non-pairing based Attribute Based Encryption scheme based on the concepts of RSA cryptosystem and Quadratic Residuosity.