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Certificate issuing method and certificate verifying method
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Certificate, certificate issuing method and system and certificate verifying method and device
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Certificate issuing method and certificate verifying method
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Electronic document, genuineness management method for print medium thereof, genuineness management system, program, and program recording medium
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Authentication method and authentication system
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Time stamp generating system
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Coupon ticket issuing system
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Method for specifying product delivery destinations
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Digital signature generating method and digital signature verifying method
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Electronic commerce advertising method and system
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Method for conducting a shareholders meeting with remote participation using a network
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Electronic payment method and system
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Method and system for recovering the validity of cryptographically signed digital data
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Automatic trading method and apparatus
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