密文策略属性加密（CP-ABE）属性撤销实现

Question

求CP-ABE中的属性撤销代码实现，或者是思路！

基础的加解密已经通过刘巍然的github代码实现

package crypto.abe;

import java.math.BigInteger;
import java.util.Vector;

public class LSSSParameters {
    private BigInteger[][] lsssmatrix;
    private Vector<String> attrs;
    public LSSSParameters(BigInteger[][] l,Vector<String> a) {
        this.lsssmatrix = l;
        this.attrs = a;
    }
    
    public BigInteger[][] getLsssmatrix() {
        return lsssmatrix;
    }
    public Vector<String> getAttrs() {
        return attrs;
    }
    public void printInform() {
        if(attrs.size() != lsssmatrix.length)
            System.out.println("Errors in LSSSParameters");
        for(int i = 0; i < attrs.size(); ++i) {
            System.out.print(attrs.get(i) + " = ");
            for(int j = 0; j < lsssmatrix[0].length; ++j)
                System.out.print(lsssmatrix[i][j] + "\t");
            System.out.println("");
        }
    }
}