Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
| mission:log:2011:06:09:random-numbers-the-fast-and-the-furious [2012-02-15 08:32] – created chrono | mission:log:2011:06:09:random-numbers-the-fast-and-the-furious [2013-06-05 14:34] (current) – external edit 127.0.0.1 | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | ====== Random numbers: The fast and the furious ====== | ||
| + | The expression **security = usability< | ||
| + | |||
| + | To wipe a 1TB (1024GB) disk with random data or prep a disk for encryption, it takes a little more than 4 days (97 hours) when utilizing / | ||
| + | |||
| + | ===== ===== | ||
| + | |||
| + | |||
| + | ===== Introducing / | ||
| + | |||
| + | [[http:// | ||
| + | |||
| + | < | ||
| + | make | ||
| + | </ | ||
| + | |||
| + | < | ||
| + | insmod ./ | ||
| + | </ | ||
| + | |||
| + | In case of missing device nodes, create them manually: | ||
| + | |||
| + | < | ||
| + | mknod / | ||
| + | chmod 444 / | ||
| + | mknod / | ||
| + | chmod 444 / | ||
| + | </ | ||
| + | |||
| + | ===== Tests ===== | ||
| + | |||
| + | ==== ebuild for dieharder test suite ==== | ||
| + | |||
| + | |||
| + | <sxh bash> | ||
| + | |||
| + | # Copyright 1999-2008 Gentoo Foundation | ||
| + | # Distributed under the terms of the GNU General Public License v2 | ||
| + | # $Header: $ | ||
| + | |||
| + | inherit eutils autotools | ||
| + | |||
| + | DESCRIPTION=" | ||
| + | | ||
| + | | ||
| + | ber generators as well as /dev/random and / | ||
| + | | ||
| + | | ||
| + | | ||
| + | | ||
| + | | ||
| + | made up or that are improvements on tests from other sources. | ||
| + | |||
| + | The primary point of this tester is to make it easy to time and test | ||
| + | | ||
| + | Three examples are provided of wrapping a random number | ||
| + | | ||
| + | | ||
| + | | ||
| + | not) that can generate a table of random numbers. | ||
| + | |||
| + | | ||
| + | | ||
| + | hence openly available for adaptation, testing, modification, | ||
| + | | ||
| + | | ||
| + | | ||
| + | It is my hope that by providing this tool in autodocumenting source, it | ||
| + | | ||
| + | suite in general." | ||
| + | |||
| + | HOMEPAGE=" | ||
| + | SRC_URI=" | ||
| + | |||
| + | LICENSE=" | ||
| + | SLOT=" | ||
| + | KEYWORDS=" | ||
| + | IUSE="" | ||
| + | |||
| + | DEPEND=" | ||
| + | RDEPEND=" | ||
| + | |||
| + | src_unpack() { | ||
| + | unpack ${A} | ||
| + | cd " | ||
| + | eautoreconf | ||
| + | } | ||
| + | |||
| + | src_compile() { | ||
| + | econf || die " | ||
| + | emake -j1 || die " | ||
| + | } | ||
| + | |||
| + | |||
| + | src_install() { | ||
| + | emake install DESTDIR=" | ||
| + | dodoc NEWS README* NOTES | ||
| + | docinto " | ||
| + | dodoc dieharder/ | ||
| + | docinto " | ||
| + | dodoc libdieharder/ | ||
| + | } | ||
| + | |||
| + | </ | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | ==== urandom test results ==== | ||
| + | |||
| + | < | ||
| + | |||
| + | < | ||
| + | # Random number generator tested: stdin_input_raw | ||
| + | # Samples per test pvalue = 100000 (test default is 100000) | ||
| + | # P-values in final KS test = 100 (test default is 100) | ||
| + | # | ||
| + | # Histogram of p-values | ||
| + | ################################################################## | ||
| + | # Counting histogram bins, binscale = 0.100000 | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # 8|****|****|****|****|****|****|****|****|****| | ||
| + | # | ||
| + | # 6|****|****|****|****|****|****|****|****|****|****| | ||
| + | # | ||
| + | # 4|****|****|****|****|****|****|****|****|****|****| | ||
| + | # | ||
| + | # 2|****|****|****|****|****|****|****|****|****|****| | ||
| + | # | ||
| + | # | ||
| + | # | 0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8| 0.9| 1.0| | ||
| + | # | ||
| + | # Results | ||
| + | Kuiper KS: p = 0.97927058 | ||
| + | Assessment: PASSED at > 5% for RGB Permutations Test | ||
| + | |||
| + | real 1m7.539s | ||
| + | user 0m13.536s | ||
| + | sys 0m51.354s | ||
| + | |||
| + | </ | ||
| + | |||
| + | ==== frandom test results ==== | ||
| + | |||
| + | < | ||
| + | |||
| + | < | ||
| + | # Run Details | ||
| + | # Random number generator tested: stdin_input_raw | ||
| + | # Samples per test pvalue = 100000 (test default is 100000) | ||
| + | # P-values in final KS test = 100 (test default is 100) | ||
| + | # | ||
| + | # Histogram of p-values | ||
| + | ################################################################## | ||
| + | # Counting histogram bins, binscale = 0.100000 | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # | ||
| + | # 8|****|****|****| | ||
| + | # | ||
| + | # 6|****|****|****|****|****|****|****|****|****|****| | ||
| + | # | ||
| + | # 4|****|****|****|****|****|****|****|****|****|****| | ||
| + | # | ||
| + | # 2|****|****|****|****|****|****|****|****|****|****| | ||
| + | # | ||
| + | # | ||
| + | # | 0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8| 0.9| 1.0| | ||
| + | # | ||
| + | # Results | ||
| + | Kuiper KS: p = 0.99947994 | ||
| + | Assessment: PASSED at > 5% for RGB Bit Distribution Test | ||
| + | |||
| + | real 0m15.707s | ||
| + | user 0m13.545s | ||
| + | sys 0m1.947s | ||
| + | |||
| + | </ | ||
| + | |||
| + | ===== Conclusion ===== | ||
| + | |||
| + | Given a good kernel entropy source (try rng-tools), / | ||
| + | |||
| + | {{tag> | ||
| + | |||
| + | ~~DISCUSSION~~ | ||