Page:Electronic Transactions Ordinance (Cap. 553).pdf/6

ELECTRONIC TRANSACTIONS ORDINANCE :(a) transmitted within an information system or from one information system to another; and
 * (b) stored in an information system or other medium;

“electronic signature” (電子簽署) means any letters, characters, numbers or other symbols in digital form attached to or logically associated with an electronic record, and executed or adopted for the purpose of authenticating or approving the electronic record;

“hash function” (雜湊函數) means an algorithm mapping or transforming one sequence of bits into another, generally smaller, set as the hash result, such that—
 * (a) a record yields the same hash result every time the algorithm is executed using the same record as input;
 * (b) it is computationally not feasible for a record to be derived or reconstituted from the hash result produced by the algorithm; and
 * (c) it is computationally not feasible that 2 records can be found to produce the same hash result using the algorithm;

“information” (資訊) includes data, text, images, sound codes, computer programmes, software and databases;

“information system” (資訊系統) means a system which—
 * (a) processes information;
 * (b) records information;
 * (c) can be used to cause information to be recorded, stored or otherwise processed in other information systems (wherever situated); and
 * (d) can be used to retrieve information, whether the information is recorded or stored in the system itself or in other information systems (wherever situated);

“intermediary” (中介人), in relation to a particular electronic record, means a person who on behalf of a person, sends, receives or stores that electronic record or provides other incidental services with respect to that electronic record;

“issue” (發出), in relation to a certificate, means the act of a certification authority of creating a certificate and notifying its contents to the person named or identified in that certificate as the person to whom it is issued;

“key pair” (配對密碼匙), in an asymmetric cryptosystem, means a private key and its mathematically related public key, where the public key can verify a digital signature that the private key generates;

“originator” (發訊者), in relation to an electronic record, means a person, by whom, or on whose behalf, the electronic record is sent or generated but does not include an intermediary;

“Postmaster General” (郵政署署長) means the Postmaster General within the meaning of the Post Office Ordinance (Cap. 98);