Patent ID: 11934368
Assignee: LENOVO (SINGAPORE) PTE. LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 8:
9. A method comprising:
receiving, by use of a processor, an encrypted data file comprising encrypted data, the encrypted data file being encrypted with an encrypted cipher using a block cipher key length selected to preserve macroscopic artifacts of the data file contents from an encrypted form of the encrypted data file, the macroscopic artifacts sufficient to identify a file type of the data file from encrypted data in the encrypted data file, the file type comprising a category of the encrypted data file;
and
determining a data type for the encrypted data file from macroscopic artifacts from the encrypted data of the encrypted data file,
wherein the data type comprises a file type, a file content class, and/or an image class.