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I am using the RSA Algorithm for encryption/decryption, and in order to decrypt the files you have to deal with some pretty big values. More specifically, things like P = C^d % n = 62^65 % 133 Now that is really the only calculations that ill be doing. I have tried using Matt McCutchen's BigInteger Library, but I am getting a lot of compiler errors during linking, such as: encryption.o(.text+0x187):encryption.cpp: undefined reference to `BigInteger::BigInteger(int)' encryption.o(.text+0x302):encryption.cpp: undefined reference to `operator<<(std::ostream&, BigInteger const&)' encryption.o(.text$_ZNK10BigIntegermlERKS_[BigInteger::operator*(BigInteger const&) const]+0x63):encryption.cpp: undefined reference to `BigInteger::multiply(BigInteger const&, BigInteger const&)' So I was wondering what would be the best way to go about handling the really big integers that come out of the RSA Algorithm. I heard that a possibility would be to declare your variables as a double long, so... long long decryptedCharacter; but I'm not sure exactly how big of an integer that can store. Well for example, I try to compile and run the following program using dev C++: #include iostream #include "bigint\BigIntegerLibrary.hh" using namespace std; int main() { BigInteger a = 65536; cout << (a * a * a * a * a * a * a * a); return 0; } then I get those errors. Derek, I thought that by including the BigIntegerLibrary.hh file, that the compiler would go through and compile all the necessary files that it will use. How should I try and compile the program above in order to resolve the linking errors?

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