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144<a name="Security">
145<h1>Security</h1>
146</a>
147<p>The .tel platform includes a friending mechanism for controlling access
148to published contact information. In fact, any NAPTR data can be secured
149and made private to any friend. For example, if Alice owns alice.tel and
150she has friends Bob and Charlie, she could make her office telephone number public,
151 restrict her email address to be shown only to Bob and Charlie, and make her home
152 phone number viewable only by Bob.</p>
153<p>Private data is encrypted and stored inside NAPTR records of type "x-crypto".
154The X-Crypto NAPTR has been designed not to break IANA ENUM service type formats
155 and abide by the IETF &#147;ENUM Experiences&#148; document.</p>
156<p>The process to secure data consists of three procedures that are
157performed by the encryption routines:</p>
158<ol>
159<li>The plaintext is processed with PKCS#1.5 or OAEP padding to provide
160extra protection against attack and create a standard block size
161(in this case 128 bytes).</li>
162<li>The plaintext is 1024-bit encrypted with the reader's public
163key to obtain 128 bytes of binary data.</li>
164<li>The binary data is Base 64 encoded so that the encrypted data
165 can be stored in a NAPTR record without containing special characters.</li>
166</ol>
167<p class="note">
168<span class="header">Note:</span> We do NOT recommend storing sensitive
169personal information such as credit card numbers inside a .tel domain. This is
170not the purpose of the .tel. </p>
171<p>The public-private key pair technique can be used for secure
172data exchange bypassing the &#147;official&#148; .tel friending system.
173All you need to know is how to decrypt your friend&#146;s encrypted data.
174</p>
175<p>For more information on the .tel security model, please read our whitepaper
176<a href="/docs/privacy.pdf">Privacy in .tel</a>.</p>
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