RC4 is the name of a symmetric key stream cipher algorithm.
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Encryption
“To alter (a file, for example) using a secret code so as to be unintelligible to unauthorized parties.” The American Heritage® Dictionary of the English Language, Fourth Edition, Copyright © 2000 by Houghton Mifflin Company. See Cipher.
View PostAdvanced Encryption Standard (AES)
The Advanced Encryption Standard (AES) was adopted by the US National Institute of Standards and Technology (NIST) to replace the Data Encryption Standard (DES). With regard to PDF; Adobe added 128 bit AES to PDF 1.7; and, 256 bit AES to PDF 1.8.
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