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    <title>Cisco TrustSec FC Link Encryption Terminology </title>
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<a name="wp1072791"> </a><h1 class="pTitle">
Cisco TrustSec FC Link Encryption Terminology

</h1>
<a name="wp1072792"> </a><p class="pBody">
The following Cisco TrustSec FC Link Encryption-related terms are used in this chapter:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1072793"> </a><li class="pSmartList1">Galois Counter Mode (GCM)&#8212;A block cipher mode of operation providing confidentiality and 
data-origin authentication.
</li>
<a name="wp1072794"> </a><li class="pSmartList1">Galois Message Authentication Code (GMAC)&#8212;A block cipher mode of operation providing only 
data-origin authentication. It is the authentication-only variant of GCM.
</li>
<a name="wp1072795"> </a><li class="pSmartList1">Security Association (SA)&#8212;A connection that handles the security credentials and controls how 
they propagate between switches. The SA includes parameters such as salt and keys.
</li>
<a name="wp1072796"> </a><li class="pSmartList1">Key&#8212;A 128-bit hexadecimal string that is used for frame encryption and decryption. The default 
value is zero.
</li>
<a name="wp1072797"> </a><li class="pSmartList1">Salt &#8212;A 32-bit hexadecimal number that is used during encryption and decryption. The same salt 
must be configured on both sides of the connection to ensure proper communication. The default 
value is zero.
</li>
<a name="wp1072754"> </a><li class="pSmartList1">Security Parameters Index (SPI) number&#8212;A 32-bit number that identifies the SA to be configured 
to the hardware. The range is from 256 to 4,294,967,295. 	
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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