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42 <div class="section" id="introduction">
43<h1>Introduction</h1>
44<p>Arm’s Platform Security Architecture (PSA) is a holistic set of threat models,
45security analyses, hardware and firmware architecture specifications, an
46open source firmware reference implementation, and an independent evaluation
47and certification scheme. PSA provides a recipe, based on
48industry best practice, that allows security to be consistently designed in, at
49both a hardware and firmware level.</p>
50<p>The PSA Cryptographic API (Crypto API) described in this document is an
51important PSA component that provides an interface to cryptographic operations
52on resource-constrained devices. The interface is user-friendly, while still
53providing access to the low-level primitives used in modern cryptography. It
54does not require that the user has access to the key material. Instead, it uses
55opaque key identifiers.</p>
56<p>This document is part of the PSA family of specifications. It defines an
57interface for cryptographic services, including cryptography primitives and a
58key storage functionality.</p>
59<p>This document includes:</p>
60<ul class="simple">
61<li>A <a class="reference internal" href="goals.html#design-goals"><span class="std std-ref">rationale</span></a> for the design.</li>
62<li>A <a class="reference internal" href="functionality.html#functionality-overview"><span class="std std-ref">high-level overview of the functionality</span></a>
63provided by the interface.</li>
64<li>A <a class="reference internal" href="sample-arch.html#architectures"><span class="std std-ref">description of typical architectures</span></a> of
65implementations for this specification.</li>
66<li>General considerations <a class="reference internal" href="implementation.html#implementation-considerations"><span class="std std-ref">for implementers</span></a>
67of this specification and <a class="reference internal" href="usage.html#usage-considerations"><span class="std std-ref">for applications</span></a> that
68use the interface defined in this specification.</li>
69<li>A <a class="reference internal" href="../api/library/index.html#api-reference"><span class="std std-ref">detailed definition</span></a> of the API.</li>
70</ul>
71<p>Companion documents will define <em>profiles</em> for this specification. A profile is
72a minimum mandatory subset of the interface that a compliant implementation must
73provide.</p>
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82<h3>Related Topics</h3>
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84 <li><a href="../index.html">Documentation overview</a><ul>
85 <li>Previous: <a href="../index.html" title="previous chapter">PSA Cryptography API 1.0</a></li>
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