Using the extended format, the member file size, Zip file size, and number of member files you can add to a Zip file are limited only by your system's resources. For all practical purposes, the 64-bit extended format eliminates all these restrictions. The original Zip file format limited the number of member files in a Zip file to 65,535, and the maximum size of both the Zip file itself and any member file to 4 gigabytes. The extended format lets you store all the data you need in Zip files of virtually unlimited size. In addition to supporting the original Zip file format, WinZip 9.0 also supports the 64-bit extensions to the Zip file format.

We have published the full specification for creating WinZip-compatible AES-encrypted Zip files, and we expect that other Zip file utility vendors will provide support for the format. Note: Recipients to whom you send AES-encrypted Zip files must have a compatible Zip file utility in order to decrypt the files. The most noticeable of these enhancements is the ability to easily encrypt the files that are already in a Zip file previously, files could be encrypted only while they were being added to the Zip file.

In addition to the new AES encryption technology, WinZip 9.0 provides a number of usability enhancements that make it easier for you to use encryption. WinZip's AES encryption is just as easy to use as traditional Zip 2.0 encryption: all you have to do is select the encryption strength and specify your password. When properly implemented as a key component of an overall security protocol, the AES permits a very high degree of cryptographic security, yet is fast and efficient in operation. government, private businesses, and individuals. WinZip 9.0's advanced encryption (FIPS-197 certified) uses the Rijndael cryptographic algorithm which, in 2001, was specified by the National Institute of Standards and Technology (NIST) in Federal Information Processing Standards (FIPS) Publication 197 as the Advanced Encryption Standard (AES).Īfter a three-year competition, the AES was announced by NIST as an approved encryption technique for use by the U.S. WinZip 9.0 supports 128- and 256-bit key AES encryption, which provide much greater cryptographic security than the traditional Zip 2.0 encryption method used in earlier versions of WinZip.

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