![]() ![]() For purposes of security, the more difficult it is to decrypt the ciphertext, the better. ![]() For example, encryption is used in the creation of certificates and digital signatures, in secure storage of secrets in the keychain, and in secure transport of information.Įncryption can be anything from a simple process of substituting one character for another-in which case the key is the substitution rule-to a complex mathematical algorithm. Most of the security APIs in macOS and iOS rely to some degree on encryption of text or data. Use of a key to reverse this process and return the data to its original ( cleartext or plaintext) form is called decryption. Such transformed data is referred to as ciphertext. You may find it helpful to read that document before reading this chapter.Įncryption is the transformation of data into a form in which it cannot be made sense of without the use of some key. Note: This chapter repeats many of the concepts in Security Overview, but with additional detail and depth.
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