众所周知，垃圾邮件发送者不仅会抓取网页并自动从 HTML 文件中提取电子邮件地址，还会从其他格式（例如 PDF）中提取电子邮件地址。
因此，最好有一种 TeX 电子邮件地址混淆方法，该方法适用于常用格式（例如 PDF、PostScript、DVI），产生的结果与未混淆的结果相同，并且不允许任何常用软件（例如 pdftotext）提取未混淆的电子邮件地址。（我想到的一个用例是将包含电子邮件地址的论文上传到 arXiv。）
因此，混淆所需的属性可以概括如下。
可移植性：使用任何常用软件编译时，最终结果必须与未混淆的版本完全相同：tex、tex+dvips、tex+dvipdfm(x)、pdftex、tex+dvips+ghostscript（直接或通过 ps2pdf 等脚本）。 特别是，当由 arXiv 编译时，所有三个生成的文件（DVI、PostScript 和 PDF）中的电子邮件地址必须与未混淆的电子邮件地址完全一样，也就是说，论文的读者不应该能够仅通过查看论文就猜出使用了混淆（尽管复制粘贴可能会失败）。
稳健性：没有常用的软件，例如
- catdvi、dvi2tty、crudetype 代表 DVI，
- ghostscript（直接或通过 ps2ascii 等脚本）、ps2txt、ps2a、用于 PostScript 的 pstotext，
- pdftotext、pdfbox、pdf2txt.py 或用于 PDF 的 ghostscript，
应该能够从 1 中生成的任何文件中提取（可能删除空格后）未混淆的电子邮件。
自包含性：该方法不得要求任何外部文件，并且只能使用当前字体。（否则，人们只能使用带有随机重新映射字符的字体，这将是一种非常可靠的混淆方法，但如果想在期刊上发表论文，这种方法就不太实用。出于同样的原因，使用其他字体（即使是同一系列的字体）也是不可接受的，因为如果更改字体，它很容易被破坏。）
已知无效的方法：
以非平凡顺序排版电子邮件地址，例如，随机排列字母。使用 catdvi、dvipdfm+pdftotext、pdftex+pdftotext 失败。
在电子邮件地址中间插入一些用微型字体排版的附加文本（例如，cmr10 at 1sp）。tex+dvipdfm+pdftotext 会失败。它还会暴露 catdvi 和 pdftex 1.40.15 中的错误，即后者是 TeX 的不合规实现。尽管可以通过使用 8sp 而不是 1sp 来解决这些错误，但该方法在 pdftex+pdftotext 中也会失败。
在电子邮件地址中间插入水平微空格，例如 1sp 或 -1sp。与 2 相同。
将单个字母稍微升高或降低一点（例如 1sp）。适用于 catdvi，但无法适用于 pdftotext。
将某个句号替换为降低其高度减去句号高度的点重音。虽然这种方法确实满足了上述所有标准，并且从某种意义上来说是一种解决方案（我目前在论文中使用它，同时以不同的顺序排版），但对于 pdftotext 来说，它只是用空格替换了句号，这仍然容易受到自动收集的影响（众所周知，垃圾邮件软件可以对更复杂的变体进行反混淆，例如“user at example dot com”，用空格替换句号肯定不会出现问题），因此它违反了条件 2，如果不是字面意思，那么就是精神上。它还依赖于 Computer Modern 字体相当微妙的属性，这意味着如果发布者使用设计较差的字体，它可能会破坏条件 1。
在电子邮件地址前插入一些排版的白色文本，并与其重叠。与以前的方法不同，这种方法有些不便于移植，但它可以很好地与大多数使用颜色特效的软件以及一些针对 pdftex 的特殊破解程序配合使用（它确实会破坏一些不太常用的软件，例如 dvilj）。不幸的是，当在非白色纸张上打印文档或只是在非白色背景上显示文档时，这种方法完全失效（这并不罕见，有些人更喜欢浅灰色或类似的颜色作为背景）。表面上，可以使用背景色的文本来解决该问题，但我不知道有任何合理的可移植方法可以做到这一点，尽管有些程序可能允许这样的破解。
答案1
如果您真的想隐藏文本，您可以提取路径并绘制它们，接下来的效果很差，主要是因为我忽略了移动和线段之间的区别，但可以改进以呈现与原始文本基本相同的效果。
首先使用一些后记将文本转换为路径；
/Times-Roman findfont 10 scalefont setfont
newpath
100 100 moveto
([email protected])
true
charpath
flattenpath
{== == (move) ==}
{== == (line) ==}
{== == == ==(curve) ==}
{(close) ==}
pathforall
showpage
产生
形式的路径
104.429482
103.061745
(line)
104.429482
102.952805
(line)
104.320549
102.795456
(line)
然后进行一些编辑，您就可以使用 tikz 渲染该路径：
稍微注意一下，就可以关闭和填充各个路径段，以产生基本上原始的字体渲染，但在这里我只是描边整个路径。
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\usepackage{tikz}
\begin{document}
aaa
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;
\end{tikzpicture}}
bbb
\end{document}
答案2
以下是按照 David Carlisle 的建议更“独立”的方法，通过以下链接进行操作我们可以从字体文件中提取构成字符的点吗？ 并尝试使用那里的代码。这是用 编译的pdflatex。
\immediate\write18{tex pgflibraryshapes.letters.dtx}
%\documentclass[border=10]{standalone}
\documentclass[landscape]{article}
\pagestyle{empty}
\thispagestyle{empty}
\usepackage{tikz}
\usetikzlibrary{
shapes.letters,
decorations.pathmorphing,
decorations.pathreplacing,
decorations.text,
decorations.footprints,
fadings,
}
\pgfmathsetmacro{\emcm}{1em/1cm}
\pgfkeys{
/pgf/letter/.cd,
% load font={stikz}{italic},
load font={stikz}{normal},
size=1,
load encoding=char,
every letter/.append style={
fill,
},
sentence width=.9\textwidth,
}
\begin{document}
\begin{tikzpicture}[every letter/.append style={path fading=west},scale=.1]
\node[letter=h] (1) {};
\node[letter=o,right of previous letter,at=(1.east)] (2) {};
\node[letter=l,right of previous letter,at=(2.east)] (3) {};
\node[letter=t,right of previous letter,at=(3.east)] (4) {};
\node[letter=z,right of previous letter,at=(4.east)] (5) {};
\node[letter=e,right of previous letter,at=(5.east)] (6) {};
\node[letter=r,right of previous letter,at=(6.east)] (7) {};
\node[letter=m,right of previous letter,at=(7.east)] (8) {};
\node[letter=a,right of previous letter,at=(8.east)] (9) {};
\node[letter=n,right of previous letter,at=(9.east)] (10) {};
\node[letter=n,right of previous letter,at=(10.east)] (11) {};
\node[letter=1,right of previous letter,at=(11.east)] (12) {};
\node[letter=7,right of previous letter,at=(12.east)] (13) {};
\node[letter=@,right of previous letter,at=(13.east)] (14) {};
\node[letter=g,right of previous letter,at=(14.east)] (15) {};
\node[letter=m,right of previous letter,at=(15.east)] (16) {};
\node[letter=a,right of previous letter,at=(16.east)] (17) {};
\node[letter=i,right of previous letter,at=(17.east)] (18) {};
\node[letter=l,right of previous letter,at=(18.east)] (19) {};
\node[letter=.,right of previous letter,at=(19.east)] (20) {};
\node[letter=c,right of previous letter,at=(20.east)] (21) {};
\node[letter=o,right of previous letter,at=(21.east)] (22) {};
\node[letter=m,right of previous letter,at=(22.east)] (23) {};
\node[above=23] (joe) {Hi, I'm Joe};
\node[below=23] (joe) {Corneli, Phd};
\end{tikzpicture}
\end{document}