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LectureNote16-DiffieHellman

LectureNote16-DiffieHellman - D IFFIE-H ELLMAN C...

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Unformatted text preview: D IFFIE-H ELLMAN C RYPTOSYSTEM P UBLIC K EY C RYPTOGRAPHY I NTRO . TO N UMBER T HEORY D IFFIE-H ELLMAN C RYPTOSYSTEM RSA C RYPTOSYSTEM O THER P UBLIC K EY C RYPTOSYSTEMS M ESSAGE D IGESTS AND C ERTIFICATES CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 30 / 93 Diffie-Hellman PKDS P UBLIC K EY C RYPTOGRAPHY I NTRO . TO N UMBER T HEORY D IFFIE-H ELLMAN C RYPTOSYSTEM RSA C RYPTOSYSTEM O THER P UBLIC K EY C RYPTOSYSTEMS M ESSAGE D IGESTS AND C ERTIFICATES CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 31 / 93 ● First public-key type scheme proposed was a PKDS by Diffie & Hellman in 1976 ● Strength based on the difficulty of the finding discrete logarithms ● Cannot be used to exchange any arbitrary message ● Cannot be used to sign a message Diffie-Hellman PKDS P UBLIC K EY C RYPTOGRAPHY I NTRO . TO N UMBER T HEORY D IFFIE-H ELLMAN C RYPTOSYSTEM RSA C RYPTOSYSTEM O THER P UBLIC K EY C RYPTOSYSTEMS M ESSAGE D IGESTS AND C ERTIFICATES CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 32 / 93 Alice Bob 1: Chooses xa...
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LectureNote16-DiffieHellman - D IFFIE-H ELLMAN C...

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