公开(公告)号：US07477738B2

公开(公告)日：2009-01-13

申请号：US11275260

申请日：2005-12-21

Applicant: Ajith Kumar Parameswaran Rajamma

Inventor： Ajith Kumar Parameswaran Rajamma

IPC: H04L9/08

CPC classification number: H04L9/16 ,  H04L9/0891 ,  H04L9/3236 ,  H04L2209/601 ,  H04L2209/80

Abstract: A device and method of encrypting a sequence. The method (300) encrypts data (Di) over a sequence of encryption periods (Ti) by generating (315) a sequence of forward encryption keys (GKfi) each associated with a respective encryption period (Ti). Each forward encryption key is generated recursively by applying a forward one way function (FFi−1) to the forward encryption key (GKFi−1) associated with the preceding encryption period (Ti−1). Next the method (300) generates (320) a sequence of reverse encryption keys (GKRi), each associated with a respective encryption period (Ti), each reverse encryption key being generated recursively by applying a reverse one way function (FRi−1) to the reverse encryption key (GKRi+1) associated with the subsequent encryption period (Ti+1). Encrypting (325) the data (Di) for each encryption period (Ti) with a respective forward encryption key (GKFi) and a respective reverse encryption key (GKFi) is then performed.

Abstract translation: 一种加密序列的设备和方法。 方法（300）通过生成（315）每个与相应的加密周期（Ti）相关联的一系列前向加密密钥（GKfi），通过加密周期序列（Ti）对数据（Di）进行加密。 通过将前向单向功能（FFi-1）应用于与先前加密周期（Ti-1）相关联的前向加密密钥（GKFi-1）来递归地生成每个前向加密密钥。 接下来，方法（300）产生（320）每个与相应加密周期（Ti）相关联的反向加密密钥序列（GKRi），每个反向加密密钥通过应用反向单向函数（FRi-1）递归地生成， 到与后续加密周期（Ti + 1）相关联的反向加密密钥（GKRi + 1）。 然后，执行用各自的前向加密密钥（GKFi）和相应的反向加密密钥（GKFi）对每个加密周期（Ti）的数据（Di）进行加密（325）。