Format-preserving cipher
US9313023B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 2014 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Dec 22, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/14
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A format-preserving cipher including an encryption and a decryption scheme supporting non-linear access to input data by allowing the selection of portions of data from a potentially larger dataset to be encrypted, thus avoiding a necessarily sequential access into the input plaintext data. The cipher first defines a forward mapping from the allowable ciphertext values to an integer set of the number of such allowable ciphertext values, and a corresponding reverse mapping. It also supports exclusion of a certain set of characters from the ciphering process. Further, the encryption algorithm can encrypt the input plaintext data while preserving its original format and length and a corresponding decryption algorithm. The cipher advantageously embodies the encryption and decryption of multi-byte values or strings of data, thus fitting a variety of industrial needs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.