公开(公告)号：JP2002051077A

公开(公告)日：2002-02-15

申请号：JP2001105972

申请日：2001-04-04

Applicant: IBM

Inventor： HEDDES MARCO C ,  CLARK DEBS JEFFREYS ,  PIYUSHI CHUNIRARU PATEL

IPC: H04L12/56 ,  G06F15/00 ,  H04L9/28

Abstract: PROBLEM TO BE SOLVED: To provide a method and system that provide a hash value of an item in a computer system and a supplementary value of the hash value. SOLUTION: Components are derived from items. The components include a 1st component and a final component. Each of the components includes a specific number of bits. The components are cascaded via at least one XOR to provide outcomes. The outcomes include the 1st outcome and the final outcome. The final outcome includes only the final component. The 1st outcome includes a result of applying exclusively ORing (EORing) to the 1st component and the remaining cascaded components among the entire components. In order to provide a hush value, a reversible hash function and a supplementary function of the reversible hash function are applied at least to the 1st outcome. The supplementary value of the hash value includes outcomes except the 1st outcome.