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HTML
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5.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title> MakeRand </title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="canonical" href="index.html">
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</head>
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<body>
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<div>
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<i> <a href="https://www.gryphel.com/index.html">www.gryphel.com</a>/c/<a href="../../index.html">minivmac</a>/<a href="../index.html">extras</a>/makerand
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- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
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</div>
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<hr>
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<h2 align=center>
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MakeRand
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</h2>
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<hr>
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<p> Download </p>
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<blockquote>
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<p> <a href="https://www.gryphel.com/d/minivmac/extras/makerand/makerand-1.0.0.zip">makerand-1.0.0.zip</a>
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(90K) a zipped hfs disk image and checksum file.
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The disk image can be mounted with Mini vMac.
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Includes source code.
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</p>
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</blockquote>
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<p>
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MakeRand is a tool for making random hexadecimal data,
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such as for use with the
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<a href="../makekeys/index.html">MakeKeys</a>
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tool.
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</p>
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<p> <img src="https://www.gryphel.com/d/minivmac/extras/makerand/screen.gif" width=514 height=344 border=0 alt="Screenshot"> </p>
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<p>
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To use MakeRand, launch the application, and start typing random
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text. Random data is gathered from the timing of your key presses. The
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text you type is also mixed in.
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</p>
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<p>
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MakeRand counts 2 to 7 bits of randomness per key press. When it
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thinks it has gathered at least 1024 bits of randomness, it
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“stirs” the pool of bits with a strong psuedo-randomizing
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function, and then takes 1024 bits and appends them in hexadecimal (base
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16) to the output window. </p>
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<p>
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You can copy this text to the clipboard to use in MakeKeys or
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elsewhere.
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When MakeRand is run inside Mini vMac, you can get
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text out of the emulated Macintosh using the “Host Copy”
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command in the Edit Menu. It is like the “Copy” command,
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except that it uses the clipboard of the real computer instead
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of the clipboard of the emulated computer. The keyboard shortcut
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is Command-Option-C. (The “Host Copy” command has
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similar effect to using the normal “Copy” command and then
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<a href="../clipout/index.html">ClipOut</a>.)
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</p>
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<p>
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If you want more than 1024 bits, you can keep typing to generate
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another block. If you want fewer bits, at any time you can click on the
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status bar (at the bottom of the window below the editing area)
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to save the bits collected so far. The status bar displays a count of
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how many bits have been collected.
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</p>
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<p>
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MakeRand does use the text you type, so how random it is does
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affect how random the output is. Perfectly typing in a passage
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from a book adds very little true randomness. Making lots of typos
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adds more randomness. Typing in gibberish is better. Mashing
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keys randomly might be better yet, except that people aren't very
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good at truly being random. Also, if you try to press keys randomly,
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you might easily fall into a simple rhythm, which would reduce the
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randomness of the timing, which is more important than the keys pressed.
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</p>
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<p>
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MakeRand is in part descended from MacPGP source code, which, as far as
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I can tell, allows derived works for noncommercial use.
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</p>
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<p>
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MacPGP has various code to try to protect secrets from other software
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running on the computer. MakeRand does not. If you are using the random
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data for something sensitive, such as with MakeKeys, you should instead
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try to secure the entire virtual machine that it is run in. Such as by
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putting the Mini vMac disk image on an encrypted volume of the host
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computer, for a start.
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</p>
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<p>
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MacPGP uses the time manager to try to determine more precisely when
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keys are pressed. But in Mini vMac, the emulated keyboard can only
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generate presses at each sixtieth of a second. So MakeRand only
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uses the “ticks” value for key presses (time in sixtieths
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of a second), so it won’t think it has more randomness than
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it really has when run in Mini vMac. How much randomness MakeRand
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counts for each keypress depends on how long it has been since the
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last key press: 0 ticks = 2 bits, 1 tick = 3 bits, 2 - 3 ticks = 4 bits,
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4 - 7 ticks = 5 bits, 8 - 15 ticks = 6 bits, 16 or more ticks = 7 bits.
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</p>
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<p>
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The Abort command in the File menu (shortcut: Command-Period)
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resets the count of randomness to zero, but it does not clear
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the pool of random bits. So if you worry that MakeRand is too optimistic
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in its estimate of randomness, you can use the Abort command
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to accumulate more, before the count reaches 1024 bits and output
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produced.
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</p>
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<p> Here is the md5 checksum for the download: </p>
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<blockquote>
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<pre>
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--------- GRY SIGNED TEXT ---------
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9131c13685ba2a4dda508056a3f1cf9c makerand-1.0.0.zip
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------- BEGIN GRY SIGNATURE -------
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Gry/4Xa8CFcUzxdN/DgElsQZEmjD6rWMMbDSL3ETqDoT8AiBeb2crMwkQAOmPeql
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NHdW0Wf93T0GMap2oo2KefpBBKd7+7Pqg43jqHmmnaZ0culMqDWlOyfJvJgv707S
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d0EVW0DbcuSySgjc0vstyb1Ds2XwjObrBMEn0D86OJA3pYwOtTXw/cj0TaMCrIyD
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-------- END GRY SIGNATURE --------
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</pre>
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</blockquote>
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<p> See the
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<a href="../../appc/index.html">Compiling</a>
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page for instructions on compiling MakeRand from the source code. </p>
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<p> : </p>
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<p> If you find MakeRand useful, please consider
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<a href="https://www.gryphel.com/c/help/index.html">helping the Gryphel Project</a>,
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of which it is a part. </p>
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<a href="https://www.gryphel.com/index.html">
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<img src="https://www.gryphel.com/d/gryphel-32.gif" width=32 height=32 border=0
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alt="gryphel logo, 1K"
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>
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</a>
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<hr>
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<div>
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<i> <a href="https://www.gryphel.com/index.html">www.gryphel.com</a>/c/<a href="../../index.html">minivmac</a>/<a href="../index.html">extras</a>/makerand
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- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
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<br>
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copyright (c) 2018 Paul C. Pratt - last update 10/15/2018
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</div>
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</body>
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</html>
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