A Calibration Service for Wattmeters and Watthour Meters - download pdf or read online

By J. D Ramboz

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3. By publicly revealing PK, the user does not reveal an easy way to compute SK. A function satisfying properties (1) to (3) above is known as a “trapdoor one-way function” and fulfills the basic criteria for public-key cryptosystems. 14 Public-key cryptosystem. 40 Electronic Payment Systems for E-Commerce PK (SK (M)) 5 M This is known as a “trapdoor one-way permutation” and can be used to implement digital signatures. This process will be described below. 2 Trapdoor one-way functions The notion of one-way functions is central to public-key cryptography.

A Kerberos ticket has the form: TCS 5 [S, [C, Addr, N, Validity, KCS]KS] 36 Electronic Payment Systems for E-Commerce A ticket contains: ◗ The name of the server (S) in plaintext; ◗ The name of the client (C); ◗ The network address of the client (Addr); ◗ A timestamp in the form of a nonce (N) to prevent replays; ◗ The period of validity of the ticket; ◗ A session key (KCS) that will be used to secure dialogues between the client and the server. TE AM FL Y A ticket is only valid for a single server and a single client.

However, deducing k given Y and G is very difficult. This form of addition constitutes a oneway function. Choosing an appropriate elliptic curve and selecting appropriate points on the curve are complex problems. However, once this has been done, the resulting curve parameters may be used for multiple users within a group. G is the public-key component that can be published widely. Current known methods for computing elliptic curve logarithms are much less efficient than those for factoring integers or computing conventional logarithms.

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A Calibration Service for Wattmeters and Watthour Meters by J. D Ramboz

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