
<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">On 6 Mar 2026, at 22:47, Tony Patti <crypto@glassblower.info> wrote:<div><div><blockquote type="cite"><div><div>According to page 289 of David Johnston's book "Random Number Generations - Principles and Practices: A Guide for Engineers and Programmers" (which I highly recommend), the intel RDRAND entropy source is NOT THERMAL, quoting from that page:<br>"The entropy source is based on metastability of a latch with a differential feedback circuit."<br></div></div></blockquote><div><br></div><div>Quoting from page 12 of <a href="https://www.intel.com/content/dam/develop/external/us/en/documents/441-intel-r-drng-software-implementation-guide-final-aug7.pdf">https://www.intel.com/content/dam/develop/external/us/en/documents/441-intel-r-drng-software-implementation-guide-final-aug7.pdf</a> :</div><div><br></div><div>"The ES runs asynchronously on a self-timed circuit and uses thermal noise within the silicon to output a random stream of bits at the rate of 3 GHz."</div><div><br></div><div>- d.</div><div><br></div></div></div></body></html>