https://kuutorvaja.eenet.ee/w/index.php?action=history&feed=atom&title=Linuxi_entroopia 2026-06-03T23:03:48Z Selle lehekülje redigeerimiste ajalugu MediaWiki 1.43.6 https://kuutorvaja.eenet.ee/w/index.php?title=Linuxi_entroopia&diff=30395&oldid=prev 2018-03-18T19:59:16Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="et"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">←Vanem redaktsioon</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Redaktsioon: 18. märts 2018, kell 19:59</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l4">4. rida:</td> <td colspan="2" class="diff-lineno">4. rida:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Näiteks võib ssh katki minna ja teatada &quot;PRNG is not seeded&quot;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Näiteks võib ssh katki minna ja teatada &quot;PRNG is not seeded&quot;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Tähele tasub seejuures panna, et probleem on /dev/<del style="font-weight: bold; text-decoration: none;">randomiga</del>, mis hakkab blokeerima, kui <del style="font-weight: bold; text-decoration: none;">etroopia hulk on liiga väike</del>, /dev/urandom <del style="font-weight: bold; text-decoration: none;">annab seevastu </del>pseudorandomit. <del style="font-weight: bold; text-decoration: none;">Seega on üks kiire võimalus randomi lõppemise korral kasutada ka psuedorandomit, näiteks asendades random device /dev all. </del>Linuxi tavakombeks on kasutada klaviatuurist, hiirest, kõvakettalt jms tulevat infot, et genereerida entroopiat juhuarvude generaatoriks. Virtuaalmasinal on aga linuxil sageli neist allikatest randomi saamisega probleeme ja seetõttu ohustab randomi vähesus eriti virtuaalmasinaid.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Tähele tasub seejuures panna, et probleem on <ins style="font-weight: bold; text-decoration: none;">eelkõige </ins>/dev/<ins style="font-weight: bold; text-decoration: none;">random seadmega</ins>, mis hakkab blokeerima, kui <ins style="font-weight: bold; text-decoration: none;">etroopiat pole anda</ins>, /dev/urandom <ins style="font-weight: bold; text-decoration: none;">genereerib seljuhul </ins>pseudorandomit.</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Linuxi tavakombeks on kasutada klaviatuurist, hiirest, kõvakettalt jms tulevat infot, et genereerida entroopiat juhuarvude generaatoriks. Virtuaalmasinal on aga linuxil sageli neist allikatest randomi saamisega probleeme ja seetõttu ohustab randomi vähesus eriti virtuaalmasinaid.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Pilt:Image01.png]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Pilt:Image01.png]]</div></td></tr> <tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l13">13. rida:</td> <td colspan="2" class="diff-lineno">14. rida:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Kui tulemuseks on vähem kui 100-200 võib olla tegemist entroopia vähesuse probleemiga.  </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Kui tulemuseks on vähem kui 100-200 võib olla tegemist entroopia vähesuse probleemiga.  </div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Nagu ülal öeldud blokeerib just random mitte urandom. Seega on üks kiire võimalus randomi lõppemise korral asendades random device /dev all. </ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  rm /dev/random  </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  rm /dev/random  </div></td></tr> </table>

Jj https://kuutorvaja.eenet.ee/w/index.php?title=Linuxi_entroopia&diff=30394&oldid=prev 2018-03-18T19:57:51Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="et"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">←Vanem redaktsioon</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Redaktsioon: 18. märts 2018, kell 19:57</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l4">4. rida:</td> <td colspan="2" class="diff-lineno">4. rida:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Näiteks võib ssh katki minna ja teatada &quot;PRNG is not seeded&quot;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Näiteks võib ssh katki minna ja teatada &quot;PRNG is not seeded&quot;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Tähele tasub seejuures panna, et probleem on /dev/randomiga, mis hakkab blokeerima, kui etroopia hulk on liiga väike, /dev/urandom annab seevastu pseudorandomit. Seega on üks kiire võimalus randomi lõppemise korral kasutada ka psuedorandomit, näiteks asendades random device /dev all. Linuxi tavakombeks on kasutada klaviatuurist <del style="font-weight: bold; text-decoration: none;">ja </del>hiirest tulevat infot, et genereerida entroopiat juhuarvude generaatoriks</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Tähele tasub seejuures panna, et probleem on /dev/randomiga, mis hakkab blokeerima, kui etroopia hulk on liiga väike, /dev/urandom annab seevastu pseudorandomit. Seega on üks kiire võimalus randomi lõppemise korral kasutada ka psuedorandomit, näiteks asendades random device /dev all. Linuxi tavakombeks on kasutada klaviatuurist<ins style="font-weight: bold; text-decoration: none;">, </ins>hiirest<ins style="font-weight: bold; text-decoration: none;">, kõvakettalt jms </ins>tulevat infot, et genereerida entroopiat juhuarvude generaatoriks<ins style="font-weight: bold; text-decoration: none;">. Virtuaalmasinal on aga linuxil sageli neist allikatest randomi saamisega probleeme ja seetõttu ohustab randomi vähesus eriti virtuaalmasinaid.</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Pilt:Image01.png]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Pilt:Image01.png]]</div></td></tr> <tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l13">13. rida:</td> <td colspan="2" class="diff-lineno">13. rida:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Kui tulemuseks on vähem kui 100-200 võib olla tegemist entroopia vähesuse probleemiga.  </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Kui tulemuseks on vähem kui 100-200 võib olla tegemist entroopia vähesuse probleemiga.  </div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  rm /dev/random  </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>  rm /dev/random  </div></td></tr> </table>

Jj https://kuutorvaja.eenet.ee/w/index.php?title=Linuxi_entroopia&diff=30393&oldid=prev 2018-03-18T19:56:43Z

<p>Uus lehekülg: &#039;Vahel võivad anda serverid väga veidraid SSLiga seotud veateateid. Mõnel juhul võib see tulla entroopia lõppemisest. Saadaoleva entroopia hulk tähendab suvalisi (random) nu...&#039;</p> <p><b>Uus lehekülg</b></p><div>Vahel võivad anda serverid väga veidraid SSLiga seotud veateateid. Mõnel juhul võib see tulla entroopia lõppemisest. Saadaoleva entroopia hulk tähendab<br /> suvalisi (random) numbreid, mis on hetkel kättesaadavad /dev/random kaudu ja kui seal pole vabu suvalisi numbreid ei saa süsteem enal SSL ühendusi luua.<br /> <br /> Näiteks võib ssh katki minna ja teatada &quot;PRNG is not seeded&quot;<br /> <br /> Tähele tasub seejuures panna, et probleem on /dev/randomiga, mis hakkab blokeerima, kui etroopia hulk on liiga väike, /dev/urandom annab seevastu pseudorandomit. Seega on üks kiire võimalus randomi lõppemise korral kasutada ka psuedorandomit, näiteks asendades random device /dev all. Linuxi tavakombeks on kasutada klaviatuurist ja hiirest tulevat infot, et genereerida entroopiat juhuarvude generaatoriks<br /> <br /> [[Pilt:Image01.png]]<br /> <br /> Seda palju entroopiat hetkel on saada näeb käsuga<br /> <br /> # cat /proc/sys/kernel/random/entropy_avail<br /> <br /> Kui tulemuseks on vähem kui 100-200 võib olla tegemist entroopia vähesuse probleemiga. <br /> <br /> <br /> rm /dev/random <br /> mknod -m 644 /dev/random c 1 9<br /> chown root:root /dev/random<br /> <br /> Entroopiast veel https://hackaday.com/2017/11/02/what-is-entropy-and-how-do-i-get-more-of-it/<br /> <br /> https://blog.cloudflare.com/ensuring-randomness-with-linuxs-random-number-generator/</div>

Jj