JP2010246158A5 - Encryption apparatus and method - Google Patents

Encryption apparatus and method Download PDF

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JP2010246158A5
JP2010246158A5 JP2010158657A JP2010158657A JP2010246158A5 JP 2010246158 A5 JP2010246158 A5 JP 2010246158A5 JP 2010158657 A JP2010158657 A JP 2010158657A JP 2010158657 A JP2010158657 A JP 2010158657A JP 2010246158 A5 JP2010246158 A5 JP 2010246158A5
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本発明は、暗号化装置および方法に関し、特に、より安全性を高めるようにした暗号化装置および方法に関する。 The present invention relates to the encryption apparatus and method, in particular, it relates to the encryption apparatus and method to enhance the safety.

本発明の第１の側面の暗号化装置は、暗号鍵を用いてデータを暗号化する暗号化装置において、他の装置との認証処理を通じて得られる第１の鍵情報を供給する第１の供給部と、前記第１の鍵情報が使用される期間中に変更される第２の鍵情報を供給する第２の供給部と、前記第２の鍵情報の変更に応じて前記期間中に所定のタイミングで変更される前記暗号鍵を、前記第１の鍵情報と前記第２の鍵情報とに基づいて生成する生成部と、前記暗号鍵を用いてデータを暗号化する暗号化部とを備える。 An encryption apparatus according to a first aspect of the present invention is a first supply that supplies first key information obtained through an authentication process with another apparatus in an encryption apparatus that encrypts data using an encryption key. A second supply unit that supplies second key information that is changed during a period in which the first key information is used, and a predetermined value during the period according to the change in the second key information. A generating unit that generates the encryption key to be changed at the timing based on the first key information and the second key information, and an encryption unit that encrypts data using the encryption key. Prepare.

本発明の第１の側面の暗号化方法は、暗号鍵を用いてデータを暗号化する暗号化装置の暗号化方法において、他の装置との認証処理を通じて得られる第１の鍵情報を供給し、前記第１の鍵情報が使用される期間中に変更される第２の鍵情報を供給し、前記第２の鍵情報の変更に応じて前記期間中に所定のタイミングで変更される前記暗号鍵を、前記第１の鍵情報と前記第２の鍵情報とに基づいて生成し、前記暗号鍵を用いてデータを暗号化する。 An encryption method according to a first aspect of the present invention provides first key information obtained through authentication processing with another device in an encryption method of an encryption device that encrypts data using an encryption key. The second key information that is changed during a period in which the first key information is used is supplied, and the encryption that is changed at a predetermined timing during the period in response to the change in the second key information A key is generated based on the first key information and the second key information, and the data is encrypted using the encryption key .

本発明の第２の側面の暗号化装置は、暗号鍵を用いてデータを暗号化する暗号化装置において、セッションキーを供給する第１の供給部と、前記セッションキーが使用されるセッション中に変更される時変キーを供給する第２の供給部と、前記時変キーの変更に応じて前記セッション中に所定のタイミングで変更される前記暗号鍵を、前記セッションキーと前記時変キーとに基づいて生成する生成部と、前記暗号鍵を用いてデータを暗号化する暗号化部とを備える。 An encryption apparatus according to a second aspect of the present invention is an encryption apparatus that encrypts data using an encryption key, wherein a first supply unit that supplies a session key and a session in which the session key is used A second supply unit that supplies a time-varying key to be changed; and the encryption key that is changed at a predetermined timing during the session in response to the change of the time-varying key; And a generating unit that generates data based on the encryption key and encrypting data using the encryption key.

本発明の第２の側面の暗号化方法は、暗号鍵を用いてデータを暗号化する暗号化装置の暗号化方法において、セッションキーを供給し、前記セッションキーが使用されるセッション中に変更される時変キーを供給し、前記時変キーの変更に応じて前記セッション中に所定のタイミングで変更される前記暗号鍵を、前記セッションキーと前記時変キーとに基づいて生成し、前記暗号鍵を用いてデータを暗号化する。 An encryption method according to a second aspect of the present invention is an encryption method of an encryption apparatus that encrypts data using an encryption key, and is changed during a session in which the session key is supplied and the session key is used. And generating the encryption key that is changed at a predetermined timing during the session according to the change of the time-varying key based on the session key and the time-varying key, and Encrypt the data using the key .

本発明の第１の側面においては、他の装置との認証処理を通じて得られる第１の鍵情報が使用される期間中に変更される第２の鍵情報の変更に応じて前記期間中に所定のタイミングで変更される暗号鍵が、前記第１の鍵情報と前記第２の鍵情報とに基づいて生成され、前記暗号鍵を用いてデータが暗号化される。 In the first aspect of the present invention, predetermined during the period according to the change of the second key information that is changed during the period in which the first key information obtained through the authentication process with another device is used. encryption key that is changed at the timing, the first key information is a generated based on said second key information, data is encrypted using the encryption key.

本発明の第２の側面においては、セッションキーが使用されるセッション中に変更される時変キーの変更に応じて前記セッション中に所定のタイミングで変更される前記暗号鍵が、前記セッションキーと前記時変キーとに基づいて生成され、前記暗号鍵を用いてデータが暗号化される。 In the second aspect of the present invention, the encryption key that is changed at a predetermined timing during the session according to the change of the time-varying key that is changed during the session in which the session key is used is the session key, The data is generated based on the time-varying key, and the data is encrypted using the encryption key .

以上の如く、本発明の第１および第２の側面によれば、より安全に暗号化を行うことが可能となる。 As described above , according to the first and second aspects of the present invention, encryption can be performed more safely.

Claims (68)

暗号鍵を用いてデータを暗号化する暗号化装置において、
他の装置との認証処理を通じて得られる第１の鍵情報を供給する第１の供給部と、
前記第１の鍵情報が使用される期間中に変更される第２の鍵情報を供給する第２の供給部と、
前記第２の鍵情報の変更に応じて前記期間中に所定のタイミングで変更される前記暗号鍵を、前記第１の鍵情報と前記第２の鍵情報とに基づいて生成する生成部と、
前記暗号鍵を用いてデータを暗号化する暗号化部と
を備える暗号化装置。 In an encryption device that encrypts data using an encryption key,
A first supply unit that supplies first key information obtained through an authentication process with another device ;
A second supply unit for supplying second key information to be changed during a period in which the first key information is used ;
A generating unit configured to generate the encryption key that is changed at a predetermined timing during the period according to the change of the second key information based on the first key information and the second key information;
Encryption apparatus comprising an encryption section for encrypting the data using the encryption key. 前記期間はセッションである
請求項１に記載の暗号化装置。 The period is a session
The encryption device according to claim 1 . 前記第１の鍵情報と前記第２の鍵情報は秘密裡に扱われる
請求項１に記載の暗号化装置。 The first key information and the second key information are handled confidentially.
The encryption device according to claim 1 . 前記第２の鍵情報は、前記暗号化装置に与えられた情報に基づいて生成される
請求項３に記載の暗号化装置。 The second key information is generated based on information given to the encryption device.
The encryption device according to claim 3 . 前記暗号鍵は、復号装置と共有される鍵である
請求項１に記載の暗号化装置。 The encryption key is a key shared with the decryption device
The encryption device according to claim 1 . 前記他の装置は、復号装置である
請求項１に記載の暗号化装置。 The other device is a decoding device.
The encryption device according to claim 1 . 前記第２の鍵情報の元となる情報は、他の装置と秘密裡に共有される秘密情報を用いて前記第２の鍵情報に変更されるThe information that is the source of the second key information is changed to the second key information using secret information that is secretly shared with other devices.
請求項１に記載の暗号化装置。The encryption device according to claim 1. 前記第２の鍵情報の元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the second key information is information that changes for each packet.
請求項７に記載の暗号化装置。The encryption device according to claim 7. 前記秘密情報は、前記第２の鍵情報の元となる情報を攪乱するための攪乱キーであるThe secret information is a disturbing key for disturbing information that is the basis of the second key information.
請求項７に記載の暗号化装置。The encryption device according to claim 7. 前記第２の鍵情報の元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the second key information is information that changes for each packet.
請求項１に記載の暗号化装置。The encryption device according to claim 1. 前記第１の鍵情報を共通鍵方式で共有する共有部A sharing unit for sharing the first key information by a common key method
をさらに備えるFurther comprising
請求項１に記載の暗号化装置。The encryption device according to claim 1. 前記共有部は、Diffie-Hellman法によって前記第１の鍵情報を共有するThe sharing unit shares the first key information by a Diffie-Hellman method.
請求項１１に記載の暗号化装置。The encryption device according to claim 11. 前記第１の鍵情報は、他の装置から受信する情報と予め保持している鍵に基づいて暗号化関数を用いて得られる鍵であるThe first key information is a key obtained by using an encryption function based on information received from another device and a previously held key.
請求項１に記載の暗号化装置。The encryption device according to claim 1. 前記第１の鍵情報は、疑似乱数であるThe first key information is a pseudo random number.
請求項１３に記載の暗号化装置。The encryption device according to claim 13. 前記暗号化関数は、ハッシュ関数であるThe encryption function is a hash function
請求項１３に記載の暗号化装置。The encryption device according to claim 13. 前記生成部は、前記第２の鍵情報と前記第１の鍵情報を加算処理することで前記暗号鍵を生成するThe generation unit generates the encryption key by adding the second key information and the first key information.
請求項１に記載の暗号化装置。The encryption device according to claim 1. 前記加算処理は、排他的論理和を含むThe addition process includes exclusive OR.
請求項１６に記載の暗号化装置。The encryption device according to claim 16. 暗号鍵を用いてデータを暗号化する暗号化装置の暗号化方法において、
他の装置との認証処理を通じて得られる第１の鍵情報を供給し、
前記第１の鍵情報が使用される期間中に変更される第２の鍵情報を供給し、
前記第２の鍵情報の変更に応じて前記期間中に所定のタイミングで変更される前記暗号鍵を、前記第１の鍵情報と前記第２の鍵情報とに基づいて生成し、
前記暗号鍵を用いてデータを暗号化する
暗号化方法。 In an encryption method of an encryption device that encrypts data using an encryption key,
Providing first key information obtained through an authentication process with another device ;
Providing second key information to be changed during a period in which the first key information is used ;
Generating the encryption key to be changed at a predetermined timing during the period in accordance with the change of the second key information based on the first key information and the second key information;
Encrypt data using the encryption key
Encryption method . 前記期間はセッションである
請求項１８に記載の暗号化方法。 The period is a session
The encryption method according to claim 18 . 前記第１の鍵情報と前記第２の鍵情報は秘密裡に扱われる
請求項１８に記載の暗号化方法。 The first key information and the second key information are handled confidentially.
The encryption method according to claim 18 . 前記第２の鍵情報は、前記暗号化装置に与えられた情報に基づいて生成される
請求項２０に記載の暗号化方法。 The second key information is generated based on information given to the encryption device.
The encryption method according to claim 20 . 前記暗号鍵は、復号装置と共有される鍵である
請求項１８に記載の暗号化方法。 The encryption key is a key shared with the decryption device
The encryption method according to claim 18 . 前記他の装置は、復号装置である
請求項１８に記載の暗号化方法。 The other device is a decoding device.
The encryption method according to claim 18 . 前記第２の鍵情報の元となる情報は、他の装置と秘密裡に共有される秘密情報を用いて前記第２の鍵情報に変更されるThe information that is the source of the second key information is changed to the second key information using secret information that is secretly shared with other devices.
請求項１８に記載の暗号化方法。The encryption method according to claim 18. 前記第２の鍵情報の元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the second key information is information that changes for each packet.
請求項２４に記載の暗号化方法。The encryption method according to claim 24. 前記秘密情報は、前記第２の鍵情報の元となる情報を攪乱するための攪乱キーであるThe secret information is a disturbing key for disturbing information that is the basis of the second key information.
請求項２４に記載の暗号化方法。The encryption method according to claim 24. 前記第２の鍵情報の元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the second key information is information that changes for each packet.
請求項１８に記載の暗号化方法。The encryption method according to claim 18. 前記第１の鍵情報を共通鍵方式で共有するSharing the first key information by a common key method
請求項１８に記載の暗号化方法。The encryption method according to claim 18. 前記第１の鍵情報をDiffie-Hellman法によって共有するSharing the first key information by Diffie-Hellman method
請求項２８に記載の暗号化方法。The encryption method according to claim 28. 前記第１の鍵情報は、他の装置から受信する情報と予め保持している鍵に基づいて暗号化関数を用いて得られる鍵であるThe first key information is a key obtained by using an encryption function based on information received from another device and a previously held key.
請求項１８に記載の暗号化方法。The encryption method according to claim 18. 前記第１の鍵情報は、疑似乱数であるThe first key information is a pseudo random number.
請求項３０に記載の暗号化方法。The encryption method according to claim 30. 前記暗号化関数は、ハッシュ関数であるThe encryption function is a hash function
請求項３０に記載の暗号化方法。The encryption method according to claim 30. 前記第２の鍵情報と前記第１の鍵情報を加算処理することで前記暗号鍵を生成するThe encryption key is generated by adding the second key information and the first key information.
請求項１８に記載の暗号化方法。The encryption method according to claim 18. 前記加算処理は、排他的論理和を含むThe addition process includes exclusive OR.
請求項３３に記載の暗号化方法。The encryption method according to claim 33. 暗号鍵を用いてデータを暗号化する暗号化装置において、In an encryption device that encrypts data using an encryption key,
セッションキーを供給する第１の供給部と、A first supply for supplying a session key;
前記セッションキーが使用されるセッション中に変更される時変キーを供給する第２の供給部と、A second supply for supplying a time-varying key that is changed during a session in which the session key is used;
前記時変キーの変更に応じて前記セッション中に所定のタイミングで変更される前記暗号鍵を、前記セッションキーと前記時変キーとに基づいて生成する生成部と、A generating unit that generates the encryption key that is changed at a predetermined timing during the session according to the change of the time-varying key, based on the session key and the time-varying key;
前記暗号鍵を用いてデータを暗号化する暗号化部とAn encryption unit for encrypting data using the encryption key;
を備える暗号化装置。An encryption device comprising: 前記セッションキーと前記時変キーは秘密裡に扱われるThe session key and the time-varying key are treated confidentially
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記時変キーは、前記暗号化装置に与えられた情報に基づいて生成されるThe time-varying key is generated based on information given to the encryption device.
請求項３６に記載の暗号化装置。The encryption device according to claim 36. 前記暗号鍵は、復号装置と共有される鍵であるThe encryption key is a key shared with the decryption device
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記セッションキーは、他の装置との通信により行われる認証処理を通じて得られる鍵であるThe session key is a key obtained through an authentication process performed by communication with another device.
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記他の装置は、復号装置であるThe other device is a decoding device.
請求項３９に記載の暗号化装置。40. The encryption device according to claim 39. 前記時変キーの元となる情報は、他の装置と秘密裡に共有される秘密情報を用いて前記時変キーに変更されるThe information that is the source of the time-varying key is changed to the time-varying key using secret information that is secretly shared with other devices.
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記時変キーの元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the time-varying key is information that changes for each packet.
請求項４１に記載の暗号化装置。The encryption device according to claim 41. 前記秘密情報は、前記時変キーの元となる情報を攪乱するための攪乱キーであるThe secret information is a disturbing key for disturbing information that is a source of the time-varying key.
請求項４１に記載の暗号化装置。The encryption device according to claim 41. 前記時変キーの元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the time-varying key is information that changes for each packet.
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記セッションキーを共通鍵方式で共有する共有部A sharing unit for sharing the session key by a common key method
をさらに備えるFurther comprising
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記共有部は、Diffie-Hellman法によって前記セッションキーを共有するThe sharing unit shares the session key by a Diffie-Hellman method.
請求項４５に記載の暗号化装置。The encryption device according to claim 45. 前記セッションキーは、他の装置から受信する情報と予め保持している鍵に基づいて暗号化関数を用いて得られる鍵であるThe session key is a key obtained by using an encryption function based on information received from another device and a pre-stored key
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記セッションキーは、疑似乱数であるThe session key is a pseudo-random number
請求項４７に記載の暗号化装置。48. The encryption device according to claim 47. 前記暗号化関数は、ハッシュ関数であるThe encryption function is a hash function
請求項４７に記載の暗号化装置。48. The encryption device according to claim 47. 前記生成部は、前記時変キーと前記セッションキーを加算処理することで前記暗号鍵を生成するThe generation unit generates the encryption key by adding the time-varying key and the session key.
請求項３５に記載の暗号化装置。36. The encryption device according to claim 35. 前記加算処理は、排他的論理和を含むThe addition process includes exclusive OR.
請求項５０に記載の暗号化装置。51. The encryption device according to claim 50. 暗号鍵を用いてデータを暗号化する暗号化装置の暗号化方法において、In an encryption method of an encryption device that encrypts data using an encryption key,
セッションキーを供給し、Supply a session key
前記セッションキーが使用されるセッション中に変更される時変キーを供給し、Providing a time-varying key that is changed during the session in which the session key is used;
前記時変キーの変更に応じて前記セッション中に所定のタイミングで変更される前記暗号鍵を、前記セッションキーと前記時変キーとに基づいて生成し、The encryption key that is changed at a predetermined timing during the session according to the change of the time-varying key is generated based on the session key and the time-varying key,
前記暗号鍵を用いてデータを暗号化するEncrypt data using the encryption key
暗号化方法。Encryption method. 前記セッションキーと前記時変キーは秘密裡に扱われるThe session key and the time-varying key are treated confidentially
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記時変キーは、前記暗号化装置に与えられた情報に基づいて生成されるThe time-varying key is generated based on information given to the encryption device.
請求項５３に記載の暗号化方法。54. The encryption method according to claim 53. 前記暗号鍵は、復号装置と共有される鍵であるThe encryption key is a key shared with the decryption device
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記セッションキーは、他の装置との通信により行われる認証処理を通じて得られる鍵であるThe session key is a key obtained through an authentication process performed by communication with another device.
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記他の装置は、復号装置であるThe other device is a decoding device.
請求項５６に記載の暗号化方法。The encryption method according to claim 56. 前記時変キーの元となる情報は、他の装置と秘密裡に共有される秘密情報を用いて前記時変キーに変更されるThe information that is the source of the time-varying key is changed to the time-varying key using secret information that is secretly shared with other devices.
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記時変キーの元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the time-varying key is information that changes for each packet.
請求項５８に記載の暗号化方法。The encryption method according to claim 58. 前記秘密情報は、前記時変キーの元となる情報を攪乱するための攪乱キーであるThe secret information is a disturbing key for disturbing information that is a source of the time-varying key.
請求項５８に記載の暗号化方法。The encryption method according to claim 58. 前記時変キーの元となる情報は、パケット毎に変化する情報であるThe information that is the basis of the time-varying key is information that changes for each packet.
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記セッションキーを共通鍵方式で共有するSharing the session key using a common key method
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記セッションキーをDiffie-Hellman法によって共有するShare the session key by Diffie-Hellman method
請求項６２に記載の暗号化方法。The encryption method according to claim 62. 前記セッションキーは、他の装置から受信する情報と予め保持している鍵に基づいて暗号化関数を用いて得られる鍵であるThe session key is a key obtained by using an encryption function based on information received from another device and a pre-stored key
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記セッションキーは、疑似乱数であるThe session key is a pseudo-random number
請求項６４に記載の暗号化方法。The encryption method according to claim 64. 前記暗号化関数は、ハッシュ関数であるThe encryption function is a hash function
請求項６４に記載の暗号化方法。The encryption method according to claim 64. 前記時変キーと前記セッションキーを加算処理することで前記暗号鍵を生成するThe encryption key is generated by adding the time-varying key and the session key.
請求項５２に記載の暗号化方法。53. The encryption method according to claim 52. 前記加算処理は、排他的論理和を含むThe addition process includes exclusive OR.
請求項６７に記載の暗号化方法。The encryption method according to claim 67.
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