decrypt

[dee-kript, di-]
verb (used with object)
to decode or decipher.

Origin:
1935–40; de- + crypt(ogram)

decryption, noun
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World English Dictionary
decrypt (diːˈkrɪpt)
 
vb
1.  to decode (a message) with or without previous knowledge of its key
2.  to make intelligible (a television or other signal) that has been deliberately distorted for transmission
 
[C20: from de- + crypt, as in cryptic]
 
de'crypted
 
adj
 
de'cryption
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

decrypt
"to solve a cryptogram," 1936, from de- + cryptogram.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In fact, repeat the encryption enough times and you will actually decrypt the
  message.
People employ public-key to distribute regular, symmetric keys, which are then
  used to encrypt and decrypt actual messages.
The user must then provide proper authentication keys to decrypt the data.
Your job is to decrypt these words, figure out what's special about these words
  and where they come from.
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