Workbook, Sheets and Ranges passwords can be instantly recovered or removed by Excel Password. It is highly optimized tool as you can see from test results listed below for some common CPUs and GPUs. Excel Password allows you to setup multiple password search attacks such as advanced mixed attacks to exploit any known password details (parts or patterns) and to cut search time required. Excel 2007-2021 (and Office 365) formats are AES-encrypted with keys generated from passwords using PBKDF2 derivation function (with many thousands of SHA hash iterations to counteract exhaustive search), thus password is required to access encrypted data. Excel 97-2003 default encryption is not very strong (40-bit RC4) and data is extractable with guarantee (please check ExcelDecryptor for details).
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