Developer Tools for Random Data Generation // v2.6.1
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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. Looking for other languages? Check our code examples in PHP , JavaScript , Python , Java , C# , Ruby and Go or use our interactive web generator.

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_device for seeding only
  • std::mt19937 is 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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Don't want to write code? Use our free web-based Passphrases generator with instant results.

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