8085 Microprocessor Pin Diagram

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Conclusions and Opinions Handwritten and digital signatures share some similarities: • Both provide the security services of authentication, data integrity, and non-repudiation. • Both handwritten and digital signatures have legal standing, and the legal standing of digital signatures is increasing with the passage of various state and national laws to become the equal (or more) of handwritten signatures. Differences between digital and handwritten signatures include: • A handwritten signature is biologically linked to a specific individual, whereas a digital signature relies on the protection afforded a private signature key by the signer, and the procedures implemented by a Certification Authority. • Handwritten signatures are under the direct control of the signer, whereas digital signatures must be applied by a computer commanded by the signer. • Forgery of handwritten signatures has been practiced for centuries, whereas forgery of digital signatures, in the absence of compromise of the private signature key, or hijacking of the signature mechanism, is virtually impossible. The mechanisms of forgery for handwritten and digital signatures are fundamentally different. • The detection of handwritten signature forgery depends on the skill of the examiner. Many handwritten forgery attempts will not be detected until after action is taken on the basis of the suspect signature (e.g., after the check is cashed). Due to the cryptographic nature of digital signatures, attempted forgeries are immediately obvious to any verifier, except in the case where a private signature key has been compromised, or control of the signing mechanism has been seized. In these cases, distinguishing between a valid and invalid digital signature may be impossible, even for a computer forensics specialist. • The data integrity service provided by digital signatures is much stronger than that

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