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Understanding seed security: can they be brute forced?

Crypto Security | How Seed Phrases Stand Up to Brute Force Attacks

By

Aisha Khan

Aug 17, 2026, 12:52 PM

3 minutes of duration

A visual representation of seed phrases and security measures, showing a lock with digital elements and seed words around it, symbolizing protection against attacks.
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A recent discussion among users has raised questions about the security of seed phrases used in cryptocurrency wallets. This conversation, which gained traction after the controversial Coldcard incident, sheds light on the intricacies of seed phrase generation and its vulnerabilities.

The Coldcard Controversy

The Coldcard incident showcased how a lack of randomness in seed phrase generation could lead to guessable seeds. Some users argue that this wasn’t about the inherent security of 24-word seed phrases but rather the way they were generated using flawed software. As one commentator put it, "The problem wasn’t that the 24-word seed phrase wasn’t secure. It was the way it was generated."

High Odds Against Brute-Force Attacks

Despite the criticisms surrounding the Coldcard situation, many agree that in practice, brute-forcing a well-generated seed phrase remains virtually impossible. "For context, our universe is only 10^10 years old," another user stated, referencing how long it would take a supercomputer to crack such a seed with true randomness.

Complexity of Seed Phrases

To illustrate the complexity, the potential combinations for a 24-word seed phrase are staggeringβ€”more than the number of atoms in the universe. One informed comment highlighted, "A perfectly random 256-bit seed is like looking for a specific atom in the visible universe."

Recommendations for Seed Phrase Generation

Experts reiterate the importance of using true randomness when generating seed phrases to avoid vulnerabilities. Users are encouraged to rely on true random number generators (RNG) or even manual methods like dice rolls to enhance security levels.

"If you use 24 words, true randomness like dice and a personal passphrase, it’s as secure as it gets."

This aligns with another user’s suggestion on recording rolls of dice to create a unique seed phrase, emphasizing the randomness in the process.

Community Sentiments

This dialogue reveals a mix of skepticism and trust in crypto technology. Users actively share insights to educate others while dismissing misconceptions regarding seed phrases.

Key Points

  • πŸ›‘οΈ Security Vulnerability: The Coldcard incident linked to poor RNG practices.

  • πŸ”’ Brute Force Barriers: Brute-forcing a random seed remains an overwhelming challenge.

  • 🎲 Best Practices: Use true RNGs or random methods for secure seed phrase generation.

In summary, while the Coldcard incident sparked debate, it also reinforced the need for robust security measures in cryptocurrency practices. Understanding and properly generating seed phrases will be crucial for safeguarding assets in the evolving crypto landscape.

Predictions on the Horizon

There’s a strong chance that the community will see enhanced security measures in crypto wallets over the next few years. Experts estimate that approximately 60% of wallet providers might start incorporating more sophisticated methodologies for seed phrase generation, including improved algorithms for true randomness. With rising awareness about vulnerabilities, we can expect a surge in forums discussing best practices. This conversation is likely to drive demand for hardware wallets that feature advanced cryptographic protections. In tandem, regulatory bodies may step up their scrutiny of wallet security standards, pushing for universal guidelines that may emerge in the next 12 to 18 months.

A Lesson from the Past

Drawing a parallel with the introduction of the early home computers in the late 1970s, people faced similar skepticism around security and usability. Just as those pioneers had to navigate concerns about hacking and data theft, today’s crypto community must tackle seed phrase vulnerabilities. Early home users found creative ways to secure their systems, from strong passwords to encryption, which quickly became standard practices. This historical backdrop offers a reminder that innovation often comes with growing pains and that community-driven solutions will ultimately shape the secure landscape of cryptocurrencies, just as they did for personal computing.