Encryption is the process of making a document unreadable by applying an algorithmic transformation to it. The encryption algorithm uses a secret key as the basis of this transformation. You can decode the encrypted text by applying the reverse transformation. If you choose the right encryption algorithm and secret key, then it is virtually impossible for anyone else to make the text readable without the key.
This encryption and decryption process is shown in Figure 7.9.
Modern encryption techniques enable you to encrypt data so that they are practically ...
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