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Bitcoin insights, guides and analysis.

Showing: Length Extension

17 articles
  • Is SHA-256 Still Secure in 2026? The Length-Extension Break That Made Bitcoin Stronger
    SHA-256

    Breaking SHA-256 in Bitcoin with length extension

    There is a working attack on SHA-256 that runs in ten minutes. Bitcoin's entire hash chain depends on SHA-256. Does the chain hold or does it fall in 2026?

    May 12, 202614 min read
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