The following typographical conventions are used in this book:
Constant width
For configuration files, things that can be found in configuration files (such as keywords and configuration file options), source code, and interactive terminal sessions.
Constant width italic
For replaceable parameters on command lines or within configuration files.
For filenames, URLs, hostnames, command names, command-line options, and new terms where they are defined.
In figures, the object labeled A has been secured using a cryptographic key labeled K. “Secured” means encrypted, signed, or some more complex relationship, depending on the context. If A is secured using multiple keys (say, K and L), they are listed in the subscript, separated by commas: A K, L.
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