[특허]Method for protecting a volatile file using a single hash

Method for protecting a volatile file using a single hash 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-012/00 G06F-003/023
출원번호	US-0154520 (1993-11-19)
발명자 / 주소	Fischer Addison M. (4073 Merchantile Ave. Naples FL 33942)
인용정보	피인용 횟수 : 77 인용 특허 : 0

초록 ▼

The present invention permits the hash of a file to be taken on an incremental basis. It permits any part of the file to be changed while allowing a new aggregate hash to be computed based on the revised file portion and the prior total hash. The aggregate has is readily updated with each record revision without having to recompute the hash of the entire file in accordance with conventional techniques. These objectives are accomplished using two functions. The first function is an effective one-way hash function “H”for which it is computationally impossible to find two data values that hash to the same result. The second function is a commutative and associative function “F”(and inverse “Finv”) and provides a mechanism for combining the aggregate hash and the hash of updated records. Examples of these latter functions include exclusive OR (“XOR”) and arithmetic addition. The hash of each file record and the has of an identification of the record (i.e., a record number or key) are combined using a function (“F”) whereby individual records may be extracted using the inverse of that function (Finv). In this fashion, an individual record may be extracted from the aggregate hash and updated. Each record is represented by its identification hashed together with its data content. All such record hashs are added together to provide a highly secure integrity check. This aggregate hash covers the entire database such that the tampering (or rearranging) of any data record is revealed by the use of the record identifier (i.e., record number) in the hash calculation due to its impact on the aggregate hash (e.g., the sum).

대표청구항 ▼

A method for protecting a collection of a plurality of discrete data units which are modified from time to time by an associated data processing system comprising the steps of: obtaining an individual hash value for each of the discrete data units by performing a hash operation using at least the data value portion of the data unit which is to be protected; and aggregating said individual hash values into an aggregate hash value for said collection using a function which permits the independent inclusion and deletion of each individual hash value from the aggregate hash value, further including the step of including as part of the data to be hashed for each data unit, indicia which distinguishes the relative order of each data unit from the other data units, wherein said indicia is one of a plurality of sequentially ordered data unit numbers.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Method for protecting a volatile file using a single hash 원문보기

초록 ▼

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연합인증

Method for protecting a volatile file using a single hash 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (77)

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