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1 Improvement of the secure dynamic ID based remote user authentication scheme for multi-server environment Authors : Han-Cheng Hsiang and Wei-Kuan Shih Speaker : Chun-Yen Lee Date : 2009/7/15 Source: to appear in Computer Standards & Interfaces
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2 Outline Review of Liao-Wang’s scheme Cryptanalysis of Liao-Wang’s scheme The improved scheme Performance comparisons
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3 Review of Liao-Wang’s scheme Registration phase secure channel
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4 Review of Liao-Wang’s scheme Login phase
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5 Mutual verification and session key agreement phase (1/2)
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6 Mutual verification and session key agreement phase (2/2)
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7 Masquerade attack U E is a legal user. U E intercepted the message { CID i, P ij, Q i, N i }. Eve computes Eve obtains T i, h(PW i ) and B i, so he can masquerade U i.
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8 The improved scheme RC x, r, y Server j Registration phase U i computes UiUi RC ID i, h(b ⊕ PW i ) (V i, B i, H i, R i, h( )) (ID i, V i, B i, b, H i, R i, h( ))
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9 The improved scheme Login phase UiUi Inputs PW i (CID i, P ij, Q i, D i, C 0, N i ) Server j
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10 The improved scheme (verification phase) Server j RC (M jr, SID j, D i, C 0, N i ) ( C 1, C 2, N rj )
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11 The improved scheme (verification phase) Server j UiUi Session key: h(B i ||A i ||N i ||N j ||SID j )
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12 Performance comparisons
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