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Assessing the safety of a 12 word seed phrase in 2025

Seed Phrase Safety | Users Weigh In on 12 Words vs 24 Words in 2025

By

Vitalik Buterin

May 19, 2025, 05:38 PM

Edited By

Cathy Hackl

Updated

May 20, 2025, 05:36 AM

2 minutes of duration

A graphic showing a secure vault with a 12 word seed phrase displayed inside, emphasizing cryptocurrency access and security.

A heated discussion among crypto enthusiasts is questioning the safety of 12-word seed phrases compared to the more popular 24-word option. On user boards, people are weighing in on the evolving technology and what it means for wallet recovery practices.

Security at Stake

The main concern revolves around security. A 12-word recovery phrase is thought to be less secure than a 24-word one, providing only 128 bits of entropy versus 256 bits with the latter. Yet, a few voices argue that using a personal passphrase alongside a 12-word phrase could bolster its defenses. One user stated, "Why wouldn’t you go the extra few steps to keep your assets safe?" This highlights a growing sentiment for added precautions to protect against potential vulnerabilities.

Active Concerns from Crypto Enthusiasts

Several themes are heating up:

  • Generation Legitimacy: Concerns continue regarding the generation of 12-word phrases, particularly since Ledger devices default to 24 words. People ask whether it’s secure to use a 12-word phrase from third-party software wallets.

  • Technological Threats: As tech advances, some fear that 12-word phrases could become outdated. "Is a 12-word seed phrase safe?" one person asked, alluding to worries about its security as future hacking methods develop.

  • Variability in Security: Some users believe that the variation of seed phrases, using different numbers like 15 or 21 words, can also yield sufficient security due to the way private keys are derived.

"Even if you give them all your seed phrase and just mix up the order, the permutations are massive."

Expert Opinions

Experts advise against reliance on 12-word phrases as a standard practice. Here are key insights:

  • πŸ” 24 Words for Security: Best practice remains to opt for a 24-word recovery phrase to ensure robust security.

  • πŸ›‘οΈ Use Trusted Hardware: Always generate recovery phrases through hardware wallets to eliminate risks tied to software wallets.

  • πŸ“ˆ Stay Informed: As new hacking methods emerge, it's critical to stay updated on your security strategies.

Interestingly, while some still advocate for 12 words, the consensus leans towards upgrading security to match growing risks. The discussion raises a crucial question: When will 12-word phrases be deemed insufficient?

Future Predictions for Seed Phrase Security

Looking ahead, experts foresee a decline in the popularity of 12-word seed phrases. Predictions suggest that wallet providers may soon eliminate support for them in favor of the more secure 24-word alternatives. As hackers sharpen their skills, urgency for upgraded security measures is increasingly critical. Current estimates project that around 70% of crypto people may transition to longer phrases by 2026, influenced by a growing awareness and expert recommendations.

Reflecting on Historical Changes in Security

Drawing parallels with early online banking practices, many once relied on simpler passwords, only to adapt as threats escalated. Just like in those times, the need to reassess security measures for seed phrases feels imperative today. This historical context shines a light on why complacency can lead to vulnerabilities in the crypto sphere.

Takeaways from the Ongoing Debate

  • β–½ Users are divided on the effectiveness of 12 vs 24 words for crypto security.

  • πŸ”’ Many advocate for additional layers of security like personal passphrases.

  • πŸ€– Concerns about quantum computing highlight the evolving nature of digital threats.