JP2002135247A - Digital information storing method - Google Patents
Digital information storing methodInfo
- Publication number
- JP2002135247A JP2002135247A JP2000358500A JP2000358500A JP2002135247A JP 2002135247 A JP2002135247 A JP 2002135247A JP 2000358500 A JP2000358500 A JP 2000358500A JP 2000358500 A JP2000358500 A JP 2000358500A JP 2002135247 A JP2002135247 A JP 2002135247A
- Authority
- JP
- Japan
- Prior art keywords
- information
- storage
- digital
- stored
- shared information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、契約書などの取引
文書や個人情報などの秘密文書をデジタル記憶媒体に保
管して管理する方法に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a method for storing and managing transaction documents such as contract documents and secret documents such as personal information in a digital storage medium.
【０００２】[0002]
【発明が解決しようとする課題】インターネット時代の
到来と文書の電子化が進む中で、契約書などの取引文書
をコンピュータシステムに保管して管理するケースが増
えてきている。このようなコンピュータシステムに保管
した情報のセキュリティを守るためには、第三者による
情報の不正アクセスや破壊などの攻撃に備えると共に、
取引相手による証拠性の喪失や原本性の喪失などの不正
に備える必要がある。With the advent of the Internet age and digitization of documents, cases where transaction documents such as contracts are stored in a computer system and managed are increasing. In order to protect the security of information stored in such computer systems, be prepared for attacks such as unauthorized access or destruction of information by third parties,
It is necessary to prepare for fraud such as loss of evidence and originality by trading partners.
【０００３】この場合の証拠性の喪失は、取引相手が契
約書などの取引文書を偽造あるいは改ざんしたり、取引
内容や取引事実を不当に事後否認するような場合に生じ
る。また、原本性の喪失は、取引相手が契約書などの取
引文書を不正にコピーして関係者以外に配布するような
場合に起こる。[0003] In this case, the loss of evidentiality occurs when a counterparty forges or falsifies a transaction document such as a contract, or unfairly denies the transaction content or the fact of the transaction. Further, loss of originality occurs when a counterparty illegally copies a transaction document such as a contract and distributes it to anyone other than the parties concerned.
【０００４】このうち、第三者による攻撃を防ぐ方法と
しては、利用者のＩＤやパスワードによって侵入を防ぐ
ユーザ認証などの方法があるが、十分に安全で確実な方
法とはいえない。また、取引相手などの関係者による不
正を防ぐ方法としては、現代暗号技術を駆使したメッセ
ージ認証などの方法があるが、これには共通鍵や公開鍵
などの鍵の安全管理の問題が発生する。また、複雑な暗
号アルゴリズムによる膨大な計算をこなすための大型で
高性能な処理装置を必要とする。[0004] Among them, as a method of preventing an attack by a third party, there is a method such as user authentication for preventing intrusion by a user ID or a password, but it cannot be said that it is a sufficiently secure and reliable method. In addition, as a method of preventing fraud by parties such as trading partners, there is a method such as message authentication using modern encryption technology, but this raises the problem of security management of keys such as common keys and public keys. . In addition, a large-sized and high-performance processing device for performing enormous calculations by a complicated encryption algorithm is required.
【０００５】そこで本発明は、簡単な暗号アルゴリズム
で第三者による攻撃や関係者による不正を防止して安全
に情報を管理できるデジタル情報の保管方法を提案する
ことを目的になされたものである。Accordingly, an object of the present invention is to propose a method for storing digital information that can securely manage information by preventing attacks by third parties and fraud by related parties with a simple encryption algorithm. .
【０００６】[0006]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明は以下のように構成した。すなわち、請求
項１の発明は、利用者の依頼する保管情報をｎ個の分散
情報に符号化してデジタル記憶媒体に保存し、保管情報
を取出すときは保存したｎ個の分散情報の全てを集合さ
せて元の保管情報に復元してなるデジタル情報保管方法
である。In order to achieve the above object, the present invention is configured as follows. That is, according to the first aspect of the present invention, the storage information requested by the user is encoded into n pieces of shared information and stored in a digital storage medium, and when the stored information is taken out, all of the stored n pieces of shared information are collected. This is a digital information storage method in which the original stored information is restored.
【０００７】請求項２の発明は、前記分散情報を前記保
管情報と同じ長さの乱数と補数で構成し、これらの乱数
と補数の各桁の加算値の１０を法とする代数値が対応す
る保管情報の各桁の数値と一致するようにしてなる請求
項１記載のデジタル情報保管方法である。According to a second aspect of the present invention, the shared information is composed of a random number and a complement having the same length as the storage information, and an algebraic value modulo 10 of an addition value of each digit of the random number and the complement corresponds. 2. The digital information storage method according to claim 1, wherein the digital information storage method is adapted to match each digit of the storage information to be stored.
【０００８】請求項３の発明は、前記分散情報を前記保
管情報と同じ長さの任意の数字列で構成し、これらの数
字列の各桁の加算値の１０を法とする代数値が対応する
保管情報の各桁の数値と一致するようになすと共に、前
記加算値の２桁目あるいはそれ以上の桁の数値が任意に
設定した数字列を形成するようにしてなる請求項１記載
のデジタル情報保管方法である。According to a third aspect of the present invention, the shared information is constituted by an arbitrary number string having the same length as the storage information, and an algebraic value modulo 10 of an added value of each digit of the number string corresponds. 2. The digital device according to claim 1, wherein each digit of the stored information matches a digit of the digit, and the digit of the second digit or more digits of the added value forms an arbitrarily set digit string. Information storage method.
【０００９】請求項４の発明は、前記分散情報の一部を
割符として利用者が保管し、残りを前記デジタル記憶媒
体に保存することを特徴とする請求項１記載のデジタル
情報保管方法である。The invention of claim 4 is the digital information storage method according to claim 1, wherein a user saves a part of the shared information as a tally and saves the rest in the digital storage medium. .
【００１０】請求項５の発明は、前記分散情報の一部を
さらに複数の分散情報に符号化し、これらを割符として
複数の利用者がそれぞれ個別に保管することを特徴とす
る請求項４記載のデジタル情報保管方法である。The invention according to claim 5 is characterized in that a part of the shared information is further encoded into a plurality of pieces of shared information, and these are stored individually as a tally by a plurality of users. Digital information storage method.
【００１１】請求項６の発明は、前記分散情報をデジタ
ル記憶媒体に保存するときは、２以上の分散情報を組合
せてこれらを同一の記憶領域に保存することを特徴とす
る請求項１記載のデジタル情報保管方法である。According to a sixth aspect of the present invention, when the shared information is stored in a digital storage medium, two or more pieces of shared information are combined and stored in the same storage area. Digital information storage method.
【００１２】請求項７の発明は、前記分散情報を組合せ
るときは、同じ組合せを排除することを特徴とする請求
項６記載のデジタル情報保管方法である。According to a seventh aspect of the present invention, there is provided the digital information storage method according to the sixth aspect, wherein the same combination is excluded when the shared information is combined.
【００１３】請求項８の発明は、前記分散情報をデジタ
ル記憶媒体に保存するときは、所定の圧縮方法で圧縮し
た分散情報の圧縮結果を付加して記憶保存することを特
徴とする請求項１記載のデジタル情報保管方法である。The invention of claim 8 is characterized in that, when the shared information is stored in a digital storage medium, a compression result of the shared information compressed by a predetermined compression method is added and stored. The digital information storage method described above.
【００１４】請求項９の発明は、前記分散情報をデジタ
ル記憶媒体に保存するときは、階層順位を設定し、所定
の圧縮方法で圧縮した分散情報の圧縮結果を階層順位の
下位の分散情報に付加し、これをインデックスとして分
散情報を階層順位の順番に従ってアクセスすることを特
徴とする請求項１記載のデジタル情報保管方法である。According to a ninth aspect of the present invention, when the shared information is stored in a digital storage medium, a hierarchical order is set, and a compression result of the shared information compressed by a predetermined compression method is assigned to the lower-level shared information of the hierarchical order. 2. A digital information storage method according to claim 1, wherein the shared information is accessed in accordance with the order of the hierarchical order using the added information as an index.
【００１５】請求項１０の発明は、前記割符を複数に分
割するときは、階層順位を設定し、所定の圧縮方法で圧
縮した割符の圧縮結果を階層順位の下位の割符に付加
し、これをインデックスとして割符を階層順位の順番に
従ってアクセスすることを特徴とする請求項５記載のデ
ジタル情報保管方法である。According to a tenth aspect of the present invention, when the tally is divided into a plurality of tallies, a hierarchy order is set, and a compression result of the tally compressed by a predetermined compression method is added to a tally lower in the hierarchy order. 6. The digital information storage method according to claim 5, wherein a tally is accessed as an index according to a hierarchical order.
【００１６】請求項１１の発明は、前記保管情報を取出
すときは、所定の圧縮方法で圧縮した保管前と取出後の
保管情報の圧縮結果を照合して同一であることを確認し
てから利用者に提供することを特徴とする請求項１記載
のデジタル情報保管方法である。According to the eleventh aspect of the present invention, when the storage information is taken out, the compression result of the storage information before and after the storage is compressed by a predetermined compression method is compared with each other to confirm that they are identical before use. The digital information storage method according to claim 1, wherein the digital information storage method is provided to a user.
【００１７】[0017]
【発明の実施の形態】以下に図面を参照して本発明の実
施の形態について説明する。図１に、本発明を実施した
デジタル情報保管方法の処理フローを示す。デジタル情
報保管方法は、利用者が保管条件Ｓを指定して保管者に
原文Ｍの保管要求を行う保管要求ステップ１００と、利
用者が取出条件Ａを指定して保管者に原文Ｍの取出要求
を行う取出要求ステップ２００と、利用者が保管者に原
文Ｍの抹消要求を行う抹消要求ステップ３００で構成す
る。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a processing flow of a digital information storage method embodying the present invention. The digital information storage method includes a storage request step 100 in which a user specifies a storage condition S and requests the custodian to store the original M, and a user specifies a retrieval condition A and requests the custodian to retrieve the original M. And a deletion request step 300 in which the user requests the custodian to delete the original text M.
【００１８】保管要求ステップ１００は、原文Ｍを所定
の圧縮方法で圧縮して圧縮原文Ｍｃを生成し、これを保
管ファイルのインデックスに付加するステップ１０１
と、保管条件Ｓに従って原文Ｍをｎ個の分割暗文Ｍｄに
分割して符号化するステップ１０２と、ｎ個の分割暗文
Ｍｄを個別にファイルに保管するステップ１０３で構成
する。A storage request step 100 is a step 101 for compressing the original text M by a predetermined compression method to generate a compressed original text Mc and adding this to the index of the storage file.
And a step 102 of dividing and encoding the original sentence M into n divided ciphertexts Md according to the storage condition S, and a step 103 of storing the n divided ciphertexts Md individually in a file.
【００１９】インデックスは、受付番号、利用者のＩＤ
とパスワード、タイムスタンプなどのヘッダ情報に圧縮
原文Ｍｃを付加する。これらのヘッダ情報は、保管要求
がある度に新たに作成して利用者に付与する。また、複
数の利用者が保管要求する場合は、それぞれの利用者に
対して個別にＩＤとパスワードを発行する。The index is a reception number, a user ID
And a compressed original Mc to header information such as a password and a time stamp. The header information is newly created and given to the user every time there is a storage request. When a plurality of users make a storage request, an ID and a password are individually issued to each user.
【００２０】保管条件Ｓは、保管情報の内容によって原
文Ｍの分割数ｎ、割符の要否、保管期限、抹消の可否な
どを指定する。なお、利用者の事後否認を防止する必要
のある保管情報に対しては、原文Ｍにデジタル署名文を
付加することを条件とする。The storage condition S designates the number of divisions n of the original text M, necessity of tally, storage time limit, availability of deletion, etc. according to the contents of the storage information. It should be noted that a condition in which a digital signature sentence is added to the original sentence M for the stored information that needs to be prevented from subsequent denial of the user.
【００２１】分割暗文Ｍｄは、原文Ｍと同じ長さのｎ−
１個の乱数列ｒと１個の補数列ｓで構成し、例えば分割
数を４とした場合、図２に示すように、３個の乱数列ｒ
１、ｒ２、ｒ３と１個の補数列ｓの各桁の加算値の１０
を法とする代数値が対応する原文Ｍの各桁の数値と一致
するように補数列ｓの各桁の値を決定する。このとき、
これらｎ−１個の乱数列ｒと１個の補数列ｓの値を任意
に設定すると、各桁の合計値の２桁目の数はｎが１２以
上であれば１０進数の０〜９、ｎが１８以上であれば１
６進数の０〜Ｆの範囲を設定できるので、保管者だけが
知る任意の秘密数を指定できる。The divided cryptogram Md has the same length as that of the original M.
It is composed of one random number sequence r and one complement sequence s. For example, when the number of divisions is 4, as shown in FIG.
1, r2, r3 and 10 of the sum of each digit of one complement sequence s
The value of each digit of the complement string s is determined so that the algebraic value modulo the corresponding value of each digit of the corresponding original text M. At this time,
If the values of the n-1 random number sequence r and one complement sequence s are set arbitrarily, the second digit of the total value of each digit is a decimal number 0 to 9 if n is 12 or more, 1 if n is 18 or more
Since the range of hexadecimal numbers 0 to F can be set, any secret number known only to the custodian can be designated.
【００２２】この秘密数は、利用者や第三者が知り得な
いので秘密情報として利用することができ、利用者や第
三者によって不正コピーなどが行われた場合の証明の根
拠になる。また、この秘密数は、特殊関数などの公知の
数字列を設定して疑念が生じたときに公表したり、ある
いは設定値をあらかじめ利用者に知らせておくことによ
り、保管者が保管情報を部分的に改ざんするなどの不正
行為をしていないことの証になる。This secret number can be used as confidential information because it cannot be known by the user or a third party, and serves as a basis for proof of unauthorized copying or the like performed by the user or the third party. The confidential number may be disclosed by the custodian when a suspicion arises by setting a known number string such as a special function, or by notifying the user of the set value in advance, so that the This is a proof that you have not been tampered with.
【００２３】保管条件Ｓに割符要を指定した場合は、分
割暗文Ｍｄの一部をＩＣカードなどの記憶媒体に記録し
て利用者に付与する。この割符を保管者が保管しない場
合は、保管ファイルのデータだけでは原文Ｍを復元でき
ないので、保管者に対して情報を秘匿できることにな
る。また、複数の利用者に割符を付与する場合は、分割
暗文Ｍｄの一部を同じ方法で利用者の数だけ再分割し、
再分割した複数の分割暗文Ｍｄ’をそれぞれ利用者に付
与する。これにより、全ての関係者の割符が揃わないと
原文Ｍを復元できないので、関係者是認の同意を得ない
と情報を取出せないことになる。When a tally is required in the storage condition S, a part of the divided ciphertext Md is recorded on a storage medium such as an IC card and given to the user. If the tally is not stored by the custodian, the original text M cannot be restored only by the data of the archiving file, so that the information can be kept secret from the custodian. In addition, in the case where a tally is given to a plurality of users, a part of the divided ciphertext Md is re-divided by the same number of users as the
A plurality of re-divided ciphertexts Md ′ are given to the user. As a result, the original text M cannot be restored unless the tally of all the related parties are aligned, so that information cannot be extracted unless the consent of the related parties is obtained.
【００２４】分割暗文Ｍｄは、ファイルに保管するとき
に各分割暗文Ｍｄを２重化して重複保管する。このと
き、図３に示すように、例えば、分割暗文Ｍｄの１番目
とｎ番目、２番目と１番目、ｎ−１番目とｎ−２番目、
ｎ番目とｎ−２番目というように、２つの異なる分割暗
文Ｍｄを同じ組合せがないように組合せて１つのファイ
ルあるいはレコードに保管する。When the divided ciphertext Md is stored in a file, each of the divided ciphertexts Md is duplicated and stored. At this time, as shown in FIG. 3, for example, the first and n-th, second and first, n-1 and n-2,
Two different divided ciphertexts Md, such as the nth and the (n-2) th, are stored in one file or record by combining them so as not to have the same combination.
【００２５】これにより、保管した分割暗文Ｍｄの一部
が欠損したときのリカバリを可能にする。同時に、分割
暗文Ｍｄを所定の圧縮方法で圧縮し、これを元の分割暗
文Ｍｄ、もしくは別の分割暗文Ｍｄに付加してファイル
に保管するこれにより、各分割暗文Ｍｄが改ざんされて
いないかどうかを個別に検証できるようにする。This enables recovery when a part of the stored divided ciphertext Md is lost. At the same time, the divided ciphertext Md is compressed by a predetermined compression method, and the compressed ciphertext Md is added to the original divided ciphertext Md or another divided ciphertext Md and stored in a file. Be individually verified for
【００２６】取出要求ステップ２００は、取出条件Ａを
審査して取出しの可否を判定するステップ２０１と、取
出要求に応じて保管ファイルから分割暗文Ｍｄを取出す
ステップ２０２と、取出した分割暗文Ｍｄを元の原文Ｍ
に復元するステップ２０３と、復元した原文Ｍをステッ
プ１０１と同じ圧縮方法で圧縮して圧縮復元原文Ｍｃ’
を生成するステップ２０４と、この圧縮復元原文Ｍｃ’
とインデックスに付加した圧縮原文Ｍｃを照合するステ
ップ２０５と、この圧縮復元原文Ｍｃ’と圧縮原文Ｍｃ
の一致を確認して復元した原文Ｍを利用者に提供するス
テップ２０６で構成する。An extraction request step 200 examines the extraction condition A to determine whether or not extraction is possible, a step 202 for extracting the divided ciphertext Md from the storage file in response to the extraction request, and a step 202 for extracting the divided ciphertext Md To the original text M
Step 203, and the restored original text M is compressed by the same compression method as in step 101 to obtain a compressed restored original text Mc '.
Is generated, and the original compressed decompression text Mc ′
Step 205 for comparing the compressed original text Mc added to the index with the compressed original text Mc ′ and the compressed original text Mc
And provides the user with the restored original sentence M after confirming the match.
【００２７】取出条件Ａは、同意書の要否、関係者の署
名の要否、抹消の要否、取出履歴の要否などを指定す
る。また、取出条件Ａを審査するときに保管情報の取出
しを要求した利用者のＩＤとパスワードをチェックして
利用者の正当性を認証する。The extraction condition A designates the necessity of a consent form, the necessity of a signature of a person concerned, the necessity of deletion, the necessity of an extraction history, and the like. Also, when examining the retrieval condition A, the validity of the user is verified by checking the ID and password of the user who has requested the retrieval of the storage information.
【００２８】保管時に割符を付与した場合は、ファイル
に保管した分割暗文Ｍｄに利用者の記憶媒体に記録した
割符を付加して分割暗文Ｍｄを元の原文Ｍに復元する。
復元した原文Ｍは、取出しを要求した利用者に提供する
前に保管時と同じ圧縮方法で圧縮して圧縮復元原文Ｍ
ｃ’を生成し、これと保管時にインデックスに付加した
圧縮原文Ｍｃを照合して同じかどうかをチェックする。When the tally is added at the time of storage, the tally recorded on the user's storage medium is added to the divided ciphertext Md stored in the file, and the divided ciphertext Md is restored to the original original text M.
The decompressed original M is compressed by the same compression method as at the time of storage before being provided to the user who requested the extraction.
c ′ is generated, and the compressed original text Mc added to the index at the time of storage is collated to check whether they are the same.
【００２９】これにより、ファイルに保管した分割暗文
Ｍｄまたは利用者に付与した割符に改ざんのないことを
確認する。また、取出しを要求した利用者に対しては、
希望により保管履歴を交付する。In this way, it is confirmed that the divided ciphertext Md stored in the file or the tally assigned to the user is not falsified. In addition, for the user who requested removal,
A storage history will be issued if desired.
【００３０】抹消要求ステップ３００は、保管条件Ｓを
審査して抹消の可否を判定するステップ３０１と、抹消
要求に応じて関連する分割暗文Ｍｄを削除するステップ
３０２で構成する。このとき、保管ファイルのインデッ
クスは指定により保管履歴として保存する。The deletion requesting step 300 comprises a step 301 for examining the storage conditions S to determine whether or not deletion is possible, and a step 302 for deleting the related divided ciphertext Md in response to the deletion request. At this time, the index of the storage file is stored as a storage history by designation.
【００３１】なお、以上の実施例では分割暗文Ｍｄを個
別に保管ファイルに保存する方法を説明したが、分割暗
文Ｍｄを所定の圧縮方法で圧縮し、これをインデックス
として別の分割暗文Ｍｄに付加することにより、全ての
分割暗文Ｍｄを保管ファイルに階層化して格納してもよ
い。In the above-described embodiment, the method of individually storing the divided ciphertext Md in the storage file has been described. However, the divided ciphertext Md is compressed by a predetermined compression method, and another divided ciphertext is used as an index. By adding to Md, all the divided ciphertexts Md may be layered and stored in a storage file.
【００３２】このとき、取出時に原文Ｍの圧縮結果、ま
たは割符の圧縮結果から最初の分割暗文Ｍｄを検索し、
この分割暗文Ｍｄの圧縮結果を付加したインデックスを
手掛かりに次の分割暗文Ｍｄを検索することを繰り返え
しながら順次分割暗文Ｍｄを取出すようにする。これに
より、分割暗文Ｍｄの階層化保存が可能になり、保管上
の安全性が向上する。At this time, at the time of extraction, the first divided ciphertext Md is searched from the compression result of the original M or the compression result of the tally,
Using the index to which the compression result of the divided ciphertext Md is added as a clue, the search for the next divided ciphertext Md is repeated to sequentially extract the divided ciphertext Md. This makes it possible to hierarchically store the divided ciphertext Md, thereby improving storage security.
【００３３】[0033]
【発明の効果】以上説明したように、本発明のデジタル
情報保管方法は、保管情報をｎ個の分散情報に符号化し
て個別に保存し、これらｎ個の分散情報の全てを集合さ
せて元の保管情報に復元する。従って、本発明によれ
ば、第三者が不正にアクセスしても符号化された個々の
分散情報だけでは元の保管情報に関して全く情報が得ら
れないので、第三者に対して高いレベルで情報を秘匿で
きる。As described above, according to the digital information storage method of the present invention, the storage information is encoded into n pieces of shared information and stored individually, and all of the n pieces of shared information are aggregated to obtain the original information. To the saved information. Therefore, according to the present invention, even if a third party gains unauthorized access, no information regarding the original storage information can be obtained at all from the encoded individual shared information alone. Information can be kept secret.
【００３４】また、本発明のデジタル情報保管方法は、
各桁の加算値の１０を法とする代数値が対応する保管情
報の各桁の数値と一致する乱数と補数で分散情報を構成
する。従って、本発明によれば、管理が面倒な鍵などを
共有する手間がなく、複雑で膨大な量の計算をしなくて
も簡単に保管情報を暗号化できる。Further, the digital information storage method of the present invention comprises:
The shared information is composed of a random number and a complement, each of which has an algebraic value modulo 10 of the added value of each digit, which coincides with the numerical value of each digit of the corresponding storage information. Therefore, according to the present invention, there is no need to share a key or the like which is cumbersome to manage, and the storage information can be easily encrypted without performing a complicated and enormous amount of calculations.
【００３５】また、本発明のデジタル情報保管方法は、
分散情報の各桁の加算値の２桁目あるいはそれ以上の桁
の数値が任意に設定した数字列を形成するようにする。
従って、本発明によれば、これを秘密情報として利用す
ることにより、保管情報の改ざんや不正コピーを抑止す
る有効な手段となり得る。Further, the digital information storage method of the present invention comprises:
Numerical values of the second digit or more of the added value of each digit of the shared information form an arbitrarily set numeric string.
Therefore, according to the present invention, by using this as confidential information, it can be an effective means for preventing falsification of the storage information and illegal copying.
【００３６】また、本発明のデジタル情報保管方法は、
分散情報の一部を割符として利用者が保管し、残りをデ
ジタル記憶媒体に保存する。また、分散情報の一部をさ
らに複数の分散情報に符号化し、これらを割符として複
数の利用者がそれぞれ個別に保管する。Further, the digital information storage method of the present invention comprises:
A part of the shared information is stored by the user as a tally, and the rest is stored in a digital storage medium. Further, a part of the shared information is further encoded into a plurality of pieces of shared information, and these are stored as tally by a plurality of users individually.
【００３７】従って、本発明によれば、保管者の分散情
報だけでは元の保管情報を復元できないので、保管者に
対して効果的に情報を秘匿できる。また、複数の利用者
が割符を個別に保管するので、関係者全員の合議のもと
に保管情報の取出しを管理できる。Therefore, according to the present invention, the original stored information cannot be restored only by the distributed information of the custodian, so that the information can be effectively concealed from the custodian. In addition, since a plurality of users store the tally individually, it is possible to manage the retrieval of the storage information based on the discussion of all the concerned parties.
【００３８】また、本発明のデジタル情報保管方法は、
同じ組合せを排除しながら２以上の分散情報を組合せて
これらを同一の記憶領域に保存する。また、分散情報に
所定の圧縮方法で圧縮した分散情報の圧縮結果を付加し
てこれらを同一の記憶領域、または別の分散情報の記憶
領域に保存する。Further, the digital information storage method of the present invention comprises:
While excluding the same combination, two or more pieces of shared information are combined and stored in the same storage area. Further, a compression result of the shared information compressed by a predetermined compression method is added to the shared information, and these are stored in the same storage area or another storage area of the shared information.
【００３９】従って、本発明によれば、分散情報の一部
が破壊されても別の記憶領域に保存した分散情報がこれ
を補うので、保管情報の回復を可能にしてシステムの信
頼性を高めることができる。また、分散情報に保管前の
圧縮結果を付加することにより、取出時に保管情報を圧
縮してこれと照合すれば、保管情報の改ざん等を検出す
ることが可能となる。Therefore, according to the present invention, even if a part of the shared information is destroyed, the shared information stored in another storage area compensates for this, so that the stored information can be recovered and the reliability of the system is improved. be able to. Further, by adding the compression result before storage to the shared information, the storage information is compressed at the time of extraction and collated with the storage information, so that falsification of the storage information can be detected.
【００４０】また、本発明のデジタル情報保管方法は、
所定の圧縮方法で圧縮した保管前と取出後の保管情報の
圧縮結果を照合して同一であることを確認してから保管
情報を利用者に提供する。従って、本発明によれば、保
管前と取出後の保管情報に変化がないかどうかを必ずチ
ェックするので、保管中に改ざんなどの不正があれば、
それを確実に検知することができる。Further, the digital information storage method of the present invention comprises:
After comparing the compression results of the storage information before storage and the storage information after extraction with a predetermined compression method to confirm that they are the same, the storage information is provided to the user. Therefore, according to the present invention, it is always checked whether or not the storage information before and after storage has changed, so if there is any fraud such as falsification during storage,
This can be reliably detected.
【図１】本発明を実施したデジタル情報保管方法の処理
フローである。FIG. 1 is a processing flow of a digital information storage method embodying the present invention.
【図２】本発明を実施した原文と分割暗文の構成例を示
す図である。FIG. 2 is a diagram showing a configuration example of an original sentence and a divided secret sentence according to the present invention;
【図３】本発明を実施した分割暗文を保管するときの組
合せを示す図である。FIG. 3 is a diagram showing a combination when storing divided ciphertexts according to the present invention;
Ａ 取出条件 Ｍ 原文 Ｍｃ 圧縮原文 Ｍｃ’ 圧縮復元原文 Ｍｄ 分割暗文 Ｓ 保管条件 ｒ 乱数列 ｓ 補数列 A Extraction condition M Original text Mc Compressed original Mc 'Compression decompressed original Md Separated cryptogram S Storage condition r Random number sequence s Complement sequence
フロントページの続き Ｆターム(参考） 5B017 AA03 BA07 CA16 5B082 GA02 GA11 5J104 AA01 AA12 AA41 JA03 Continued on the front page F-term (reference) 5B017 AA03 BA07 CA16 5B082 GA02 GA11 5J104 AA01 AA12 AA41 JA03
Claims (11)
情報に符号化してデジタル記憶媒体に保存し、保管情報
を取出すときは保存したｎ個の分散情報の全てを集合さ
せて元の保管情報に復元してなるデジタル情報保管方
法。The storage information requested by a user is encoded into n pieces of shared information and stored in a digital storage medium. When the stored information is taken out, all of the stored n pieces of shared information are aggregated to obtain the original information. A digital information storage method that restores stored information.
の乱数と補数で構成し、これらの乱数と補数の各桁の加
算値の１０を法とする代数値が対応する保管情報の各桁
の数値と一致するようにしてなる請求項１記載のデジタ
ル情報保管方法。2. The shared information is composed of a random number and a complement having the same length as the storage information, and each of the storage information corresponding to an algebraic value modulo 10 of the addition value of each digit of the random number and the complement. 2. The digital information storage method according to claim 1, wherein the digital information storage device is configured to match a digit value.
の任意の数字列で構成し、これらの数字列の各桁の加算
値の１０を法とする代数値が対応する保管情報の各桁の
数値と一致するようになすと共に、前記加算値の２桁目
あるいはそれ以上の桁の数値が任意に設定した数字列を
形成するようにしてなる請求項１記載のデジタル情報保
管方法。3. The shared information is composed of an arbitrary number sequence having the same length as the storage information, and each of the storage information corresponding to an algebraic value modulo 10 of the added value of each digit of these number sequences corresponds to the shared information. 2. The digital information storage method according to claim 1, wherein the numerical value of the second digit or the digit of the second digit or more of the added value forms a numerical string arbitrarily set, while being made to coincide with the numerical value of the digit.
が保管し、残りを前記デジタル記憶媒体に保存すること
を特徴とする請求項１記載のデジタル情報保管方法。4. The digital information storage method according to claim 1, wherein a user saves a part of the shared information as a tally and saves the rest in the digital storage medium.
情報に符号化し、これらを割符として複数の利用者がそ
れぞれ個別に保管することを特徴とする請求項４記載の
デジタル情報保管方法。5. The digital information storage method according to claim 4, wherein a part of the shared information is further encoded into a plurality of pieces of shared information, and these are stored as individual tallies by a plurality of users.
するときは、２以上の分散情報を組合せてこれらを同一
の記憶領域に保存することを特徴とする請求項１記載の
デジタル情報保管方法。6. The digital information storage method according to claim 1, wherein when the shared information is stored in a digital storage medium, two or more pieces of shared information are combined and stored in the same storage area.
合せを排除することを特徴とする請求項６記載のデジタ
ル情報保管方法。7. The digital information storage method according to claim 6, wherein when combining the shared information, the same combination is excluded.
するときは、所定の圧縮方法で圧縮した分散情報の圧縮
結果を付加して記憶保存することを特徴とする請求項１
記載のデジタル情報保管方法。8. The method according to claim 1, wherein when the shared information is stored in a digital storage medium, a compression result of the shared information compressed by a predetermined compression method is added and stored.
Digital information storage method described.
するときは、階層順位を設定し、所定の圧縮方法で圧縮
した分散情報の圧縮結果を階層順位の下位の分散情報に
付加し、これをインデックスとして分散情報を階層順位
の順番に従ってアクセスすることを特徴とする請求項１
記載のデジタル情報保管方法。9. When storing the shared information in a digital storage medium, a hierarchical order is set, and a compression result of the shared information compressed by a predetermined compression method is added to the shared information lower in the hierarchical order. 2. The shared information is accessed as an index according to the order of the hierarchical order.
Digital information storage method described.
層順位を設定し、所定の圧縮方法で圧縮した割符の圧縮
結果を階層順位の下位の割符に付加し、これをインデッ
クスとして割符を階層順位の順番に従ってアクセスする
ことを特徴とする請求項５記載のデジタル情報保管方
法。10. When dividing the tally into a plurality, a hierarchy order is set, a compression result of the tally compressed by a predetermined compression method is added to a lower tally of the hierarchy order, and the tally is used as an index to divide the tally into a hierarchy. 6. The digital information storage method according to claim 5, wherein access is performed according to the order of the order.
圧縮方法で圧縮した保管前と取出後の保管情報の圧縮結
果を照合して同一であることを確認してから利用者に提
供することを特徴とする請求項１記載のデジタル情報保
管方法。11. When retrieving the storage information, the compression results of the storage information before storage and the storage information compressed by a predetermined compression method are collated to confirm that they are the same, and then provided to the user. 2. The digital information storage method according to claim 1, wherein:
Priority Applications (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000358500A JP2002135247A (en) | 2000-10-20 | 2000-10-20 | Digital information storing method |
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|---|---|
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| Country | Link |
|---|---|
| JP (1) | JP2002135247A (en) |
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