Variable-length cipher system and method
US9361617B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2009 |
| Grant date | Jun 7, 2016 |
| Priority date | — |
| Expiry date | Oct 21, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/56
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Systems and methods for enciphering data are provided. In one embodiment, information is enciphered using a variable block length cipher that returns the encrypted symbol set in the same format as the plaintext symbol set. The cipher can be based on DES, AES or other block ciphers. In one example implementation a method for enciphering token information the invention provides for enciphering token information by constructing a tweak of a defined length using token information; converting the tweak to a bit string of a defined size to form a first parameter; converting a number of digits of plaintext to a byte string of a defined size to form a second parameter, wherein the number of digits converted varies; defining a data encryption standard key; applying the data encryption standard key to the first and second parameters; computing a specified number of encryption rounds; and receiving enciphered token information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.