verb (used with object)

1940–45; en-1 + -crypt (abstracted from cryptic, cryptography, etc.), modeled on encode

encryption, encryptation, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
encrypt (ɪnˈkrɪpt)
1.  to put (a message) into code
2.  to put (computer data) into a coded form
3.  to distort (a television or other signal) so that it cannot be understood without the appropriate decryption equipment
[C20: from en-1 + crypt, as in crypto-]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1975 in computer sense, from en- + crypt (see crypto-). Related: Encrypted; encrypting.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
encrypt   (ěn-krĭpt)  Pronunciation Key 
To alter information using a code or mathematical algorithm so as to be unintelligible to unauthorized readers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In theory, quantum cryptography--the use of quantum systems to encrypt
  information securely--is perfectly secure.
Critics say that it did not protect its servers sufficiently and used
  algorithms to encrypt data that can be easily cracked.
Instead, it is the keys used to encrypt the data that rely on quantum theory.
Past systems designed to encrypt e-mails all relied on ways of storing their
  keys safely.
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