smartcard_systems - CSE 425 Introduction to Computer...

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CSE 425, Introduction to Computer Security Smartcard Systems © 2008 by Wayne R. Dyksen. All Rights Reserved. SC-1 Michigan State University Department of Computer Science and Engineering Smartcard Systems Professor Wayne Dyksen Department of Computer Science and Engineering Michigan State University Spring 2008 CSE 425, Introduction to Computer Security SC-2 Smartcard Systems Security Concepts Smartcard Architecture(s) Smartcard Examples SC-3 Encryption Encryption Key Clear Text Encryption Algorithm Cipher Text SC-4 Encryption Illustrated wrd5573 hello world Encryption Algorithm zfqqa#mayqj Encryption Key Clear Text Cipher Text SC-5 Decryption Decryption Key Cipher Text Encryption Algorithm Clear Text SC-6 Decryption Illustrated mlb5779 zfqqa#mayqj Decryption Algorithm hello world Decryption Key Cipher Text Clear Text
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CSE 425, Introduction to Computer Security Smartcard Systems © 2008 by Wayne R. Dyksen. All Rights Reserved. SC-2 Michigan State University Department of Computer Science and Engineering SC-7 Encryption/Decryption • Symmetric – Encryption key == decryption key – E.g., UNIX crypt command • Asymmetric – Encryption key != decryption key – E.g., Public key cryptography SC-8 Public Key Cryptography • Private Key – Encryption key – My secret – E.g., wrd5573 • Public Key – Decryption key – For the world to know – E.g., mlb5779 SC-9 PK Exam Question mlb5779 zfqqa#mayqj Public Key Decryption Algorithm hello world What can you conclude? Public Decryption Key Cipher Text Clear Text SC-10 Digital Signature Illustrated (1) wrd5573 Transfer $1,000 Signed, Wayne Dyksen Public Key Signing Algorithm Transfer $1,000 Signed, 3obxl$g(kbvzlx Private Encryption Key SC-11 Digital Signature Illustrated (2) mlb5779 Transfer $1,000 Signed, 3obxl$g(kbvzlx Public Key Decryption Algorithm Transfer $1,000 Signed, Wayne Dyksen Public Decryption Key SC-12 Digital Certificate Illustrated (1) Verisign Private Key Wayne Dyksen [email protected] mlb5779 Verisign Certificate Generator Wayne Dyksen [email protected] mlb5779 Signed, 8oWmqmaH
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smartcard_systems - CSE 425 Introduction to Computer...

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