Generate Passphrases in C++
Complete code tutorial with examples and best practices
[ Code Example - Quick Summary ]
Language: C++
What: Generate cryptographically secure passphrases in C++ using modern C++11/14 random number facilities. This implementation uses <code>std::random_device</code> for entropy.
Try it: Use our interactive Passphrases generator or integrate this code into your C++ application.
Generate cryptographically secure passphrases in C++ using modern C++11/14 random number facilities. This implementation uses std::random_device for entropy.
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C++ Code Example
#include <iostream>
#include <vector>
#include <string>
#include <random>
#include <algorithm>
class PassphraseGenerator {
private:
std::vector<std::string> wordlist = {
"ability", "able", "about", "above", "accept" // ... 7771 more
};
std::random_device rd;
public:
std::string generate(int wordCount = 6) {
std::mt19937 gen(rd());
std::uniform_int_distribution<> dist(0, wordlist.size() - 1);
std::vector<std::string> words;
words.reserve(wordCount);
for (int i = 0; i < wordCount; ++i) {
words.push_back(wordlist[dist(gen)]);
}
// Join words with hyphens
std::string result;
for (size_t i = 0; i < words.size(); ++i) {
if (i > 0) result += "-";
result += words[i];
}
return result;
}
};
int main() {
PassphraseGenerator generator;
// Generate 6-word passphrase
std::string passphrase = generator.generate(6);
std::cout << passphrase << std::endl;
// Output: "crystal-thunder-mountain-freedom-velocity-quantum"
return 0;
}
[EXPLANATION]
Modern C++ provides robust random number generation through std::random_device for seeding and std::mt19937 for generation. This implementation uses std::uniform_int_distribution to ensure uniform selection across the wordlist. The approach is suitable for desktop applications and embedded systems.
Expected Output
crystal-thunder-mountain-freedom-velocity-quantum phoenix-nebula-cascade-brilliant-harmony-infinite cosmos-radiant-starlight-jupiter-eclipse-zenith
Common Use Cases
- Qt desktop application passwords
- Embedded system security
- Game client authentication
- Cross-platform password managers
- Native mobile apps (with NDK)
Important Notes
-
Use
std::random_devicefor seeding only -
std::mt19937is fast but not cryptographically secure - For cryptographic security, consider OpenSSL or Crypto++
- Load wordlist from file for flexibility
- Consider Boost.Random for older compilers
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