+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Unlimited_randomness_with_the_ChaosKey_.html">Unlimited randomness with the ChaosKey?</a></div>
+ <div class="date"> 1st March 2017</div>
+ <div class="body"><p>A few days ago I ordered a small batch of
+<a href="http://altusmetrum.org/ChaosKey/">the ChaosKey</a>, a small
+USB dongle for generating entropy created by Bdale Garbee and Keith
+Packard. Yesterday it arrived, and I am very happy to report that it
+work great! According to its designers, to get it to work out of the
+box, you need the Linux kernel version 4.1 or later. I tested on a
+Debian Stretch machine (kernel version 4.9), and there it worked just
+fine, increasing the available entropy very quickly. I wrote a small
+test oneliner to test. It first print the current entropy level,
+drain /dev/random, and then print the entropy level for five seconds.
+Here is the situation without the ChaosKey inserted:</p>
+
+<blockquote><pre>
+% cat /proc/sys/kernel/random/entropy_avail; \
+ dd bs=1M if=/dev/random of=/dev/null count=1; \
+ for n in $(seq 1 5); do \
+ cat /proc/sys/kernel/random/entropy_avail; \
+ sleep 1; \
+ done
+300
+0+1 oppføringer inn
+0+1 oppføringer ut
+28 byte kopiert, 0,000264565 s, 106 kB/s
+4
+8
+12
+17
+21
+%
+</pre></blockquote>
+
+<p>The entropy level increases by 3-4 every second. In such case any
+application requiring random bits (like a HTTPS enabled web server)
+will halt and wait for more entrpy. And here is the situation with
+the ChaosKey inserted:</p>
+
+<blockquote><pre>
+% cat /proc/sys/kernel/random/entropy_avail; \
+ dd bs=1M if=/dev/random of=/dev/null count=1; \
+ for n in $(seq 1 5); do \
+ cat /proc/sys/kernel/random/entropy_avail; \
+ sleep 1; \
+ done
+1079
+0+1 oppføringer inn
+0+1 oppføringer ut
+104 byte kopiert, 0,000487647 s, 213 kB/s
+433
+1028
+1031
+1035
+1038
+%
+</pre></blockquote>
+
+<p>Quite the difference. :) I bought a few more than I need, in case
<div class="title"><a href="http://people.skolelinux.org/pere/blog/Detect_OOXML_files_with_undefined_behaviour_.html">Detect OOXML files with undefined behaviour?</a></div>
<div class="date">21st February 2017</div>
<div class="entry">
<div class="title"><a href="http://people.skolelinux.org/pere/blog/Detect_OOXML_files_with_undefined_behaviour_.html">Detect OOXML files with undefined behaviour?</a></div>
<div class="date">21st February 2017</div>
@@ -751,61+822,6 @@ the mean time I provide an override in isenkram.</p>
</div>
<div class="padding"></div>
</div>
<div class="padding"></div>
- <div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Oolite__a_life_in_space_as_vagabond_and_mercenary___nice_free_software.html">Oolite, a life in space as vagabond and mercenary - nice free software</a></div>
<a href="http://people.skolelinux.org/pere/blog/Where_did_that_package_go___mdash__geolocated_IP_traceroute.html">Where did that package go? — geolocated IP traceroute</a>
<div class="entry">
<div class="title">
<a href="http://people.skolelinux.org/pere/blog/Where_did_that_package_go___mdash__geolocated_IP_traceroute.html">Where did that package go? — geolocated IP traceroute</a>
@@ -12078,6+12155,8 @@ be the only one fitting our needs. :/</p>
projects / homepage.git / commitdiff