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Home/ Questions/Q 633163
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T20:09:18+00:00 2026-05-13T20:09:18+00:00

Is there an x where SHA1(x) == x ? I’m looking for a proof

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Is there an x where SHA1(x) == x?
I’m looking for a proof or a strong argument against it.

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  1. Editorial Team
    Editorial Team
    2026-05-13T20:09:18+00:00Added an answer on May 13, 2026 at 8:09 pm

    The same arguments apply here as for the question Is there an MD5 fixed point?
    I.e. for a randomly chosen function it is about 63%.

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