Method, system, and apparatus for probabilistic identification of encrypted files
US11544390B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 2020 |
| Grant date | Jan 3, 2023 |
| Priority date | — |
| Expiry date | Sep 21, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2125
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A mechanism for probabilistically determining the contents of an encrypted file is provided, such that a transfer of the encrypted file can be restricted according to rules associated with an unencrypted version of the file. Embodiments generate a file size table of a subset of files, where each entry of the file size table includes a size information regarding the unencrypted file. Embodiments compare the size of the encrypted file against the file sizes and compressed file size ranges to determine whether the encrypted file has a match. If the size of the encrypted file has a single match in the table, then there is a high probability that the file associated with the matching entry is the unencrypted version of the encrypted file. Rules associated with restricting access of the file related to the matching entry can be used to control transfer of the encrypted file.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.