<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 2018-07-28 (209), at 23:10:15, Mike Lisanke <<a href="mailto:mikelisanke@gmail.com" class="">mikelisanke@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">On Fri, Jul 27, 2018 at 8:06 AM, Christoph Anton Mitterer <span dir="ltr" class=""><<a href="mailto:calestyo@scientia.net" target="_blank" class="">calestyo@scientia.net</a>></span> wrote:<br class=""><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hey.<br class="">
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I’m basically looking into encryption of (backup) files for the very long term (like at least 20 years).<br class=""></blockquote></div></div></div></div></blockquote><div><br class=""></div>[….]</div><div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="gmail_extra">We are taught the only provably secure cryptography is a random key as large as your data which Xor produces perfect encryption. A book cipher is a simplification</div><div class="gmail_extra">as a book is not random data. If you use a generator for your randomness, it's not random. If you use a random data source, collect enough for your entire data, and</div><div class="gmail_extra">have a secure place to place this random key, then, In Theory, your cryptography will remain secure forever... or until you lose (or misplace) the random key. <br class=""></div><div class="gmail_extra"><br class=""></div><div class="gmail_extra">-- <br class=""><div class="gmail_signature" data-smartmail="gmail_signature">Best regards, Mike</div>
</div></div></div></blockquote><br class=""></div><div>Also, one supposes, upon one’s ”guaranteed” (let alone legally enforceable) bit-rot survival rate over twenty (20) years.</div><div><br class=""></div><div>0.999999999 … ? Is that enough for crypto?</div><div>__outer</div><div><br class=""></div></body></html>