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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dita PUBLIC "-//OASIS//DTD DITA Composite//EN" "ditabase.dtd">
<dita xml:lang="en-GB">
<topic id="topic_flg_p3y_5db">
<title>Key Selection</title>
<body>
<p>Selecting keys to encrypt to or to sign with will be a common occurrence when working with
GPGMe and the means available for doing so are quite simple.</p>
<p>They do depend on utilising a Context; however once the data is recorded in another
variable, that Context does not need to be the same one which subsequent operations are
performed.</p>
<p>The easiest way to select a specific key is by searching for that key's key ID or
fingerprint, preferably the full fingerprint without any spaces in it. A long key ID will
probably be okay, but is not advised and short key IDs are already a problem with some being
generated to match specific patterns. It does not matter whether the pattern is upper or
lower case.</p>
<p>So this is the best method:</p>
<p>
<codeblock id="keysel-01" outputclass="language-python">import gpg
k = gpg.Context().keylist(pattern="258E88DCBD3CD44D8E7AB43F6ECB6AF0DEADBEEF")
keys = list(k)
</codeblock>
</p>
<p>This is passable and very likely to be common:</p>
<p>
<codeblock id="keysel-02" outputclass="language-python">import gpg
k = gpg.Context().keylist(pattern="0x6ECB6AF0DEADBEEF")
keys = list(k)
</codeblock>
</p>
<p>And this is a really bad idea:</p>
<p>
<codeblock id="keysel-03" outputclass="language-python">import gpg
k = gpg.Context().keylist(pattern="0xDEADBEEF")
keys = list(k)
</codeblock>
</p>
<p>Alternatively it may be that the intention is to create a list of keys which all match a
particular search string. For instance all the addresses at a particular domain, like
this:</p>
<p>
<codeblock id="keysel-04" outputclass="language-python">import gpg
ncsc = gpg.Context().keylist(pattern="ncsc.mil")
nsa = list(ncsc)
</codeblock>
</p>
</body>
</topic>
</dita>
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