JP5548912B2 - 無線通信デバイスにおけるローカルなセキュリティ鍵更新 - Google Patents
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Description
本願は2010年3月5日提出の米国仮特許出願第61/311,174号の優先権を主張しており、この全体をここに参照として組み込む。
技術的な実施形態の概略を先ず示した後で、特定の技術的な実施形態の詳述に入る。この要約は、読み手に本技術を分からせる手助けを意図しており、技術の鍵となる特徴または本質的な特徴を特定したり、請求する主題の範囲を限定したりする意図はない。
Claims (25)
- 基地局(BS)でセキュリティ鍵を更新する方法であって、
前記基地局から移動局にハンドオーバコマンドを送信する段階と、
前記基地局で認証鍵カウンタの基地局インスタンスを増分する段階と、
前記認証鍵カウンタの前記基地局インスタンスと、予め認証器から得ておいた認証鍵(AK)とを利用して、前記基地局で新たなローカル認証鍵(AK*)を計算する段階と、
所定のアクション時間の後に、前記新たなローカル認証鍵を用いて前記基地局が前記移動局と通信する段階と
を備える方法。 - 前記ハンドオーバコマンドを送信する段階は、
対象となる前記基地局を、サービス提供を行う前記基地局に設定する段階を有する請求項1に記載の方法。 - 前記新たなローカル認証鍵から計算され、前記基地局が前記移動局から受信した新たなCMAC(シーマック:Cipher-based Message Authentication Code)ダイジェストを利用して、前記基地局で前記新たなローカル認証鍵を検証する段階をさらに備える、請求項1または請求項2に記載の方法。
- 認証鍵カウンタ値を持つ前記基地局インスタンスで、前記認証器において前記認証鍵カウンタの認証器インスタンスを更新する段階をさらに備える請求項1から請求項3のいずれか1つに記載の方法。
- 前記移動局から認証鍵カウンタ値を持つ移動局インスタンスを受信する段階をさらに備える請求項1から請求項4のいずれか1つに記載の方法。
- 前記認証鍵カウンタ値を持つ前記移動局インスタンスが、認証鍵カウンタ値を持つ基地局インスタンスより大きい場合には、前記認証鍵カウンタ値を持つ前記基地局インスタンスを、前記認証鍵カウンタ値を持つ前記移動局インスタンスで更新する段階をさらに備える請求項5に記載の方法。
- 前記基地局が、前記基地局と通信する中継局(RS)へ前記新たなローカル認証鍵を送信する段階と、
前記新たなローカル認証鍵を利用して、前記中継局を介して前記移動局と通信する段階と
をさらに備える請求項1から請求項6のいずれか1つに記載の方法。 - 前記基地局から前記ハンドオーバコマンドを送信する段階は、
前記移動局が、前記基地局から前記中継局への直接通信を送信するとき、前記中継局から直接前記基地局に送信するとき、または、前記中継局から別の中継局に送信するときに行われる請求項7に記載の方法。 - 前記新たなローカル認証鍵を計算する段階は、
移動局の識別情報と基地局の識別情報とを利用する段階を有し、
前記移動局の識別情報は、移動局の媒体アクセス制御(MAC)アドレスであり、前記基地局の識別情報は、基地局のMACアドレスである、請求項1から請求項8のいずれか1つに記載の方法。 - 前記新たなローカル認証鍵を計算する段階は、
前記新たなローカル認証鍵(AK*)を、AK*=KDF(AK,MSID|BSID|AK_COUNT|"AK*",長さ)で計算する段階を有し、
鍵導出関数(KDF)は、前記AK、MS識別情報(MSID)用のMS媒体アクセス制御(MAC)アドレス、BS識別情報(BSID)用のBS MACアドレス、及び、前記認証鍵カウンタ(AK_COUNT)の最新の基地局インスタンスを用いて、「長さ」分の鍵サイズの前記新たなローカル認証鍵を計算する、請求項1から請求項9のいずれか1つに記載の方法。 - CMAC鍵及びトランスポート暗号鍵(TEK)の少なくともいずれかを、前記新たなローカル認証鍵を利用して導出する段階をさらに備える請求項1から請求項10のいずれか1つに記載の方法。
- 前記ハンドオーバコマンドの送信は、トランスポート暗号鍵(TEK)カウンタのロールオーバがトリガとなって行われる請求項1から請求項11のいずれか1つに記載の方法。
- 前記認証器からAKを取得する段階をさらに備え、
前記AKは、前記認証鍵を得る前に、ペアワイズマスター鍵(PMK)から前記認証器で導出され、前記PMKは、拡張可能認証プロトコル(EAP)認証の一部として、AAA(Authentication, Authorization and Accounting)サーバと前記移動局(MS)との間で生成され、前記AAAサーバは、前記PMKを前記認証器に送信する、請求項1から請求項12のいずれか1つに記載の方法。 - 移動局(MS)でセキュリティ鍵を更新する方法であって、
同じ現在のサービス提供基地局にハンドオーバするために、前記移動局において前記基地局からハンドオーバコマンドを受信する段階と、
認証鍵カウンタの移動局インスタンスを、前記移動局で増分する段階と、
前記認証鍵カウンタの前記移動局インスタンスと、予め前記移動局で計算しておいた認証鍵(AK)とを利用して、前記移動局で新たなローカル認証鍵(AK*)を計算する段階と、
所定のアクション時間の後に、前記新たなローカル認証鍵を利用して前記移動局が前記基地局と通信する段階と
を備える方法。 - 前記移動局によって前記基地局にハンドオーバ要求を送信して、前記同じ現在のサービス提供基地局である、要求を受ける対象の基地局で、前記ローカル認証鍵を更新する段階をさらに備える請求項14に記載の方法。
- 新たなCMACを利用して前記新たなローカル認証鍵を検証する段階をさらに備え、前記移動局は、前記新たなCMACを前記基地局に送信し、前記新たなCMACは、前記新たなローカル認証鍵から計算される、請求項14または請求項15に記載の方法。
- 前記新たなCMACを利用して前記新たなローカル認証鍵を検証する段階は、
前記基地局からの、基地局計算CMACとともにハンドオーバコマンドを受信する段階を有する請求項16に記載の方法。 - 前記基地局からの認証鍵カウンタ値の基地局インスタンスを受信する段階をさらに備える請求項14から請求項17のいずれか1つに記載の方法。
- 前記新たなローカル認証鍵を計算する段階は、
移動局識別情報及び基地局識別情報を利用する段階を有し、
前記移動局識別情報は、移動局媒体アクセス制御(MAC)アドレスであり、前記基地局識別情報は、基地局MACアドレスである、請求項14から請求項18のいずれか1つに記載の方法。 - 前記新たなローカル認証鍵を計算する段階は、
前記新たなローカル認証鍵(AK*)を、AK*=KDF(AK,MSID|BSID|AK_COUNT|"AK*",長さ)で計算する段階を有し、
鍵導出関数(KDF)は、前記AK、MS識別情報(MSID)用のMS媒体アクセス制御(MAC)アドレス、BS識別情報(BSID)用のBS MACアドレス、及び、前記認証鍵カウンタ(AK_COUNT)の前記移動局インスタンスを用いて、「長さ」分の鍵サイズの前記新たなローカル認証鍵を計算する、請求項14から請求項19のいずれか1つに記載の方法。 - ローカルセキュリティ鍵更新をする基地局(BS)であって、
移動局にハンドオーバコマンドを送信するトランシーバモジュールと、
認証鍵カウンタの基地局インスタンスを増加させるカウンタモジュールと、
前記認証鍵カウンタの前記基地局インスタンスと、予め認証器から得ておいた認証鍵(AK)とを利用して、新たなローカル認証鍵(AK*)を導出する処理モジュールと、
所定のアクション時間を示すクロックモジュールと
を備え、
前記所定のアクション時間の後で、前記新たなローカル認証鍵を利用して前記トランシーバモジュールが前記移動局と通信することができるようになる、基地局。 - 前記トランシーバモジュールは、対象となる前記基地局を、サービス提供を行う前記基地局に設定して、前記ハンドオーバコマンドを送信する、請求項21に記載の基地局。
- 前記トランシーバモジュールは、認証鍵カウンタ値を持つ前記基地局インスタンスで、前記認証器における前記認証鍵カウンタの認証器インスタンスを更新する、請求項21または請求項22に記載の基地局。
- セキュリティ鍵を更新するプログラムであって、
移動局(MS)のコンピュータに、
基地局からハンドオーバコマンドを受信する段階と、
認証鍵カウンタの移動局インスタンスを増加させる段階と、
前記認証鍵カウンタの前記移動局インスタンスと、予め計算しておいた認証鍵(AK)とを利用して、新たなローカル認証鍵(AK*)を導出する段階と、
所定のアクション時間の後に、前記新たなローカル認証鍵を利用して前記基地局と通信する段階と
を実行させるためのプログラム。 - 前記ハンドオーバコマンドを受信する段階は、
対象となる前記基地局を、サービス提供を行う前記基地局に設定する段階を有する請求項24に記載のプログラム。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US31117410P | 2010-03-05 | 2010-03-05 | |
US61/311,174 | 2010-03-05 | ||
PCT/US2011/027323 WO2011109795A2 (en) | 2010-03-05 | 2011-03-05 | Local security key update at a wireless communication device |
Publications (2)
Publication Number | Publication Date |
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JP2013521722A JP2013521722A (ja) | 2013-06-10 |
JP5548912B2 true JP5548912B2 (ja) | 2014-07-16 |
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