公开(公告)号：US07212631B2

公开(公告)日：2007-05-01

申请号：US09920784

申请日：2001-08-01

Applicant: Roberto Fabian Averbuj ,  Pradeep Kumar Mishra ,  Rajat Rajinderkumar Dhawan

Inventor： Roberto Fabian Averbuj ,  Pradeep Kumar Mishra ,  Rajat Rajinderkumar Dhawan

IPC: H04L9/00

CPC classification number: H04L9/0625 ,  H04L2209/12 ,  H04L2209/24

Abstract: Techniques for efficient KASUMI ciphering are disclosed. In one aspect, one KASUMI round for generating a fractional portion of the KASUMI cipher is deployed with appropriate feedback such that eight sequential rounds produce the KASUMI output. In another aspect, one third of the FO function is deployed with appropriate feedback such that three successive cycles produce the FO output. In yet another aspect, the FI function is deployed with appropriate feedback such that two subsequent cycles produce the FI output. In yet another aspect, a sub-key generator comprising two shift registers produces sub-keys for each round and sub-stage thereof in an efficient manner. These aspects, collectively, yield the advanced benefits of low area and low cost implementations of KASUMI with a simple user interface. Various other aspects of the invention are also presented.

Abstract translation: 公开了用于高效KASUMI加密的技术。 在一个方面，用适当的反馈部署用于产生KASUMI密码的小数部分的一个KASUMI循环，使得八个连续循环产生KASUMI输出。 在另一方面，FO功能的三分之一部署有适当的反馈，使得三个连续的周期产生FO输出。 在另一方面，FI功能部署有适当的反馈，使得两个后续周期产生FI输出。 在另一方面，一种包括两个移位寄存器的子密钥生成器以有效的方式为其每个轮次和子级产生子密钥。 通过简单的用户界面，这些方面统一地产生了KASUMI的低面积和低成本实施的先进优势。 还提出了本发明的各种其它方面。