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Provides the classes and interfaces for cryptographic operations. The
cryptographic operations defined in this package include encryption,
key generation and key agreement, and Message Authentication Code
(MAC) generation.

<p>Support for encryption includes symmetric, asymmetric, block, and
stream ciphers. This package also supports secure streams and sealed
objects.

<p>Many of the classes provided in this package are provider-based.  The
class itself defines a programming interface to which applications may
write.  The implementations themselves may then be written by
independent third-party vendors and plugged in seamlessly as needed.
Therefore application developers may take advantage of any number of
provider-based implementations without having to add or rewrite code.

<h2>Related Documentation</h2>

For further documentation, please see:
<ul>
  <li>
    <a href=
      "{@docRoot}/../technotes/guides/security/crypto/CryptoSpec.html">
      <b>Java<FONT SIZE=-2><SUP>TM</SUP></FONT>
       Cryptography Architecture API Specification and Reference
      </b></a></li>
  <li>
    <a href=
      "{@docRoot}/../technotes/guides/security/crypto/HowToImplAProvider.html">
      <b>How to Implement a Provider for the
      Java<FONT SIZE=-2><SUP>TM</SUP></FONT> Cryptography Architecture
      </b></a></li>
</ul>

@since 1.4
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