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Published: 25 August 2022



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  • 監査担当者や規制当局の要件では多要素認証 (MFA) が課せられているが、このような要件を満たすためだけにユーザー認証を選択しても、アカウント乗っ取り (ATO) やその他のアイデンティティ関連リスクを十分に軽減できず、ユーザー・エクスペリエンス (UX) も損なわれる恐れがある。

  • ユーザーや環境を示すシグナルのわずかな違いに基づいてそれぞれの認証フローに引き渡す「リスク・ベース」のアプローチは有用であるが、複数のツール間で機能が断片化されていることが原因で、より多数のシグナルと豊富なアナリティクスを組み合わせる効果的なアプローチの実施が妨げられる。

  • ステップアップ認証によってトラスト (信頼性) を高める従来型のリスク・ベース認証のアプローチでは、「合格 (Pass)」という結果を暗黙的に信頼して追加の分析を行わない場合、かなりのリスクが残存する可能性がある。


アイデンティティ/アクセス管理 (IAM) を担当するセキュリティ/リスク・マネジメント (SRM) のリーダーは、以下を行う。

  • 単にチェックボックスを埋めるような形でコンプライアンスの取り組みを進めるのではなく、リスクに応じた選択肢を重視し、多様なUXニーズを網羅することで、MFAに対して効果的な選択を行う。

  • アダプティブ・アクセスのコンテキストにおいて「リスク・ベース」のアプローチを拡大し、深化させることで、レジリエンス (回復力)、柔軟性、およびUXを強化する。

  • アナリティクス・ツールおよびオーケストレーション・ツールにさらに投資し、有効性の向上を総合的に図ることで、継続的でアダプティブなトラスト (Continuous Adaptive Trust: CAT) を提供し、コンテキストに応じた対応を実現する。

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Kaoru Yano

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