CPABE

Ciphertext-policy attribute-based encryption based on LSSS<br/>

Package: cpabe-lsss0.1.rar<br/> Developer: <br/> Contact: <br/> Last updated: November 27, 2014<br/> Descriptions: <br/> The cpabe toolkit provides a set of programs implementing ciphertext-policy attribute-based encryption scheme based on LSSS. Our contribution is realizing the schema by Java based on. It uses jpbc-api-1.2.1.jar, jpbc-plaf-1.2.1.jar for the algebraic operations. (http://gas.dia.unisa.it/projects/jpbc/index.html)<br/>

Reference paper:<br/> The scheme is implemented as described in the following paper. <br/> (1) Ciphertext-Policy Attribute-Based Encryption<br/> John Bethencourt, Amit Sahai, and Brent Waters. 28th IEEE Symposium on Security and Privacy (Oakland) , May 2006. <br/> (2) Ciphertext-Policy Attribute-Based Encryption: An Expressive, Efficient, and Provably<br/> Secure Realization. Brent Waters. 14th International Conference on Practice and Theory in Public Key Cryptography, Taormina, Italy, March 6-9, 2011. Proceedings.<br/> Bugs and Limitations:<br/> Tested but are not sure for no bugs. What’s more, the implementing of access policy analysis is not perfect as I consider. If you find any bugs, an email (or even a patch!) directed to..., I would be appreciated.<br/>

Instruction:<br/> The toolkit offers two set of interface:<br/> 1.Read/write file<br/> public void setup(String pubfile, String mkfile)<br/> This method generates public key and master key, result is stored in pubfile and mkfile.<br/> public void keygen(String pubfile, String mkfile, String attfile, String prifile, String attList)<br/> This method generates attribute key and private key. The attList is a set of attribute list, like (A,B,C) and (Lily, Mike).<br/> public String encrypt(String policy, String pubfile, String plaintext, String encfile)<br/> This method encrypts the plaintext with public key and policy. The policy reflects access structure. We can set the policy like (A and B) ,((Lily and Mike) or Boss).<br/> public String decrypt(String pubfile, String attfile, String prifile, String outfile)<br/> This method decrypts the ciphertext with private key and attribute key, the decrypted text is stored in outfile.<br/>

2.InterValue Class<br/> The class InterValue contains the attributes of pubKey, masKey, attKey, priKey, encrypted, plaintext;<br/> public void setup(InterValue value)<br/> This method generates public key and master key. The result is stored in the object value.<br/> public void keygen(InterValue value, String list)<br/> This method generates attribute key and private key. The attList is a set of attribute list, like (A,B,C) and (Lily, Mike).<br/> Notice: The public key and master key must be valued before revoking this method.<br/> public String encrypt(InterValue value , String policy, String plaintext)<br/> This method encrypts the plaintext with public key and policy. The policy reflects access structure. We can set the policy like (A and B) ,((Lily and Mike) or Boss). <br/> Notice: The public key must be valued before revoking this method.<br/> public String decrypt(InterValue value)<br/> This method decrypts the ciphertext with private key and attribute key, the decrypted text is stored in outfile.<br/> Notice: The public key, attribute key, private key, and ciphertext must be valued before revoking this method.<br/>