Note that the Zip file format extension used by WinZip to store AES-encrypted files is supported by WinZip 9.0 or later and is supported by some other Zip file utilities. Please read about encryption passwords and about password policy standards defined in the WinZip configuration. The security of your data depends not only on the strength of the encryption method but also on the strength of your password, including factors such as length and composition of the password and the measures you take to ensure that your password is not disclosed to unauthorized third parties. An advantage of 128-bit AES is that it is slightly faster than 256-bit AES, that is, it takes less time to encrypt or decrypt a file. 256-bit AES is stronger than 128-bit AES, but both of them can provide significantly greater security than the standard Zip 2.0 method described below. These numbers refer to the size of the encryption keys that are used to encrypt the data. WinZip supports AES encryption in two different strengths: 128-bit AES and 256-bit AES. This encryption method, also known as Rijndael, has been adopted by NIST as a Federal Information Processing Standard. Government's National Institute of Standards (NIST).
WinZip's ® encryption facility gives you a way to protect sensitive documents contained in your archives from unauthorized viewing. About Encryption About encryption and encryption methods
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