这个程序是网络信息安全概论课的课程实践,自己动手编写一个具于1024位大数

运算的ELGamal加密系统。

ELGamal 依赖大数运算，目前主流ELGamal算法都建立在512 到1024位的大数运算之上。

而大多数的编译器只能支持到64位的整数运算，即我们在运算中所使用的整数必须小

于等于64位，即：0xffffffffffffffff，也就是18446744073709551615，这远远达不

到RSA 的需要，于是需要专门建立大数运算库来解决这一问题-network information security Introduction of the course in practice, personally prepared with a majority in the 1024 operations ELGamal encryption system. ELGamal rely on large numbers efficiently, Currently mainstream ELGamal algorithms are built on 512-1024 Operators of large numbers above. Most of the compiler can only support 64-bit integer operations, Operators that we are used to be rounded up to less than 64, namely : 0xffffffffffffffff. 18446744073709551615 is, it is far less than the needs of the RSA, therefore need to establish specialized majority of the operation to resolve this problem