While we have attempted to provide the necessary details of the current WinZip AES encryption format, developers and other interested third parties will need to have or obtain an understanding of basic encryption concepts, Zip file format, etc.ĭevelopers should also review AES Coding Tips page. This document is not a tutorial on encryption or Zip file structure. We believe that use of the free encryption code and of this specification will make it easy for all developers to add compatible advanced encryption to their Zip file utilities. Additionally, we are providing information about a no-cost third-party source for the actual AES encryption code-the same code that is used by WinZip. Without compromising the basic Zip file format, WinZip Computing has extended the format specification to support AES encryption, and this document fully describes the format extension.
Note that as of WinZip 11, WinZip itself encrypts most files using the AE-1 format and encrypts others using the AE-2 format.įrom time to time we may update the information provided here, for example to document any changes to the file formats, or to add additional notes or implementation tips. The AE-2 encryption specification, a minor variant of the original AE-1 specification differing only in how the CRC is handled, was introduced in WinZip 9.0 Beta 3, released in January, 2004. The AE-1 encryption specification was introduced in WinZip 9.0 Beta 1, released in May 2003. This document describes the file format that WinZip uses to create AES-encrypted Zip files. It is intended for developers of Zip file utilities.Ĭhanges since the original version of this document are summarized in the Change History section below.
NOTE: WinZip ® users do not need to read or understand the information contained on this page. AES Encryption Information: Encryption Specification AE-1 and AE-2ĭocument version: 1.04 Last modified: January 30, 2009
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