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Public Key Cryptography

This presentation outlines the fundamentals of Public Key Cryptography (PKC), focusing on its role in ensuring confidentiality, integrity, and availability of data. PKC is highlighted as a methodology rather than just a technology, emphasizing its principles such as digital identity assurance, data privacy, and protection against alteration. It also discusses the implications of digital signatures, key management, and the importance of establishing a secure digital identity. Lastly, challenges like key revocation and exposure are addressed, ensuring better understanding for real estate professionals.

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Public Key Cryptography

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Presentation Transcript

  1. Public Key Cryptography Michael Watson Security Incident Management Director Virginia Real Estate Appraiser Board Electronic Portal Committee Meeting November 17, 2008 www.vita.virginia.gov 1

  2. What is Public Key Cryptography? • Methodology not technology • Technology adopts this process • Based on three principles • Confidentiality • Integrity • Availability • Ties to a digital identity • Provides assurance the data retains its privacy, is not altered, and the original data remains available

  3. Confidentiality • Definition • Assurance of data privacy – only the intended entity or entities may read the data • Digital Encryption • Certificates can provide complete confidentiality using encryption • Private Key • Accessible only by the digital identity who would send related messages

  4. Integrity • Definition • Assurance of non-alteration – the data has not been undetectably modified • Public Key/Private Key • Data encrypted or signed with one can be decrypted with the other • Digital Signature • The encryption of the unique identifier (often referred to as a hash) for the message sent • Typically an encrypted hash • Hash can’t be calculated without the original message • Public key used to decode message verification sent by the public key owner

  5. Availability • Definition • Assurance the original data remains accessible – all algorithms protecting the data should be able to provide access to the data. • PKI algorithms provide availability to the original data

  6. Establishing a Digital Identity • You need to be who you say you are… • Establish your digital identity with a digital representation. • Private Key • Public Key • You need a way for others to confirm they have the right digital identity for you. • Confirmation that the digital representation hasn’t been tampered with and is the one that belongs to you. • Fingerprint/Hash • Digital Signature • Positive Identification Required • Self Certify vs Third Party

  7. The Downside – Key Management • Revoking Certificates • Compromise, Loss, Exposure, etc. • Certificate Revocation Lists • Expiring Trust • Keys, like passwords, can, and should, expire after a period of time.

  8. Questions? Thank you!

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