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All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 1 Internet/Marks Hitachi, Ltd. 1999.4.15,16 - Visual Marks for Cyber World -

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Presentation on theme: "All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 1 Internet/Marks Hitachi, Ltd. 1999.4.15,16 - Visual Marks for Cyber World -"— Presentation transcript:

1 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 1 Internet/Marks Hitachi, Ltd. 1999.4.15,16 - Visual Marks for Cyber World -

2 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 2 Basic Concept of Cyber-World Marks Marks (e.g., traffic signals) are extremely useful in real world. Convey information briefly and clearly Familiar to non-professionals Marks (e.g., blue-ribbon marks) are useful BUT insecure in cyber world. Easy to forge and tamper Easy to copy-paste on unauthorized data Useful and Secure marks are desired for cyber world.

3 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 3 Internet/Marks (IMs) Internet/Marks (IMs) Material Image Data （ JPEG, bitmap, etc ） Internet/Marks （ JPEG, bitmap, etc ） Water- marking Embedded digital signature Recommend for School Education SCIENCE Recommend for School Education SCIENCE Digital Signature for - Material image data - WWW page contents - URL of WWW site - Certificate of IMs issuer

4 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 4 Structure of Internet/Marks Data on which IMs is pasted IMs Hash Digital signature Secret key Embed by Digital Watermarking Paste Digital signature detects - Forge and tamper of IMs - IMs copied on unauthorized data - Forge and tamper of data

5 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 5 IMs Application to WWW Authentication WWW page on which IMs is pasted IMs Hash Digital signature Secret key Embed by Digital Watermarking Paste Digital signature detects - Forge and tamper of IMs - IMs copied on unauthorized data - Forge and tamper of data and - IMs and WWW page copied on unauthorized site URL Hash

6 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 6 Structure of IMs-Based WWW Authentication CA IMs Issuer WWW Page Owner 1. Application for IMs with URL and WWW page contents IMs WWW page with IMs 2. Make sign, issue IMs 3. Paste IMs on WWW page 4. Read IMs, Verify signature when needed Register public key Public Key for signature verification* *This process can be eliminated by embedding public key and its certificate in IMs. WWW Page User 5. Verify current validation when needed

7 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 7 Alternative Methods Digital Signature Digital Signature 1. Simple mark 2. Digital signature 3. Simple mark + Digital signature 4. Internet/Marks

8 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 8 Comparison with Alternative Methods - Performance Summary -

9 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 9 Comparison with Alternative Methods - Operations -

10 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 10 Requirements for Internet/Marks WWW page on which IMs is pasted IMs Hash Digital signature Secret key Embed by Digital Watermarking Paste URL Hash Requirements Function - Hash - Sign/Verify using public-key cryptography - Embed/Detect data by watermarking technique Inclusion of signature (basic) - Visual Marks (IMs) - WWW page - URL of legitimate WWW site/page Inclusion of signature (option) - URL of IMs issuer etc.

11 All rights reserved. Copyright (c) 1999, Hitachi, Ltd. Slide 11 Relation between Signed XML and IMs Signed XML … … … … … … … … IMs … sample.jpg

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