2. In these Rules —| “approved certification authority” means a person or an organisation appointed by the Chief Surveyor to issue a certificate; |
| “asymmetric cryptosystem” means a system capable of generating a secure key pair, consisting of a private key for creating a digital signature, and a public key to verify the digital signature; |
“certificate” means a record that at a minimum —| (a) | identifies the approved certification authority issuing it; | | (b) | names or identifies its subscriber; | | (c) | contains the subscriber’s public key; and | | (d) | is digitally signed by the approved certification authority issuing it; |
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| “correspond”, in relation to private or public keys, means to belong to the same key pair; |
“digital signature” means an electronic signature consisting of a transformation of an electronic record using an asymmetric cryptosystem and a hash function such that a person having the initial untransformed electronic record and the signer’s public key can accurately determine —| (a) | whether the transformation was created using the private key that corresponds to the signer’s public key; and | | (b) | whether the initial electronic record has been altered since the transformation was made; |
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| “electronic record” means a record generated, communicated, received or stored by electronic, magnetic, optical, or other means of storage in an information system or for transmission from one information system to another; |
| “electronic signature” means any letter, character, number or other symbol in digital form attached to or logically associated with an electronic record, and executed or adopted with the intention of authenticating or approving the electronic record; |
“hash function” means an algorithm mapping or translating one sequence of bits into another, generally smaller set (called in these Rules 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 infeasible that a record can be derived or reconstituted from the hash result produced by the algorithm; and | | (c) | it is computationally infeasible that 2 records can be found that produce the same hash result using the algorithm; |
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| “information system” means the information system specified by a subscriber to which electronic records may be transmitted by the Chief Surveyor to the subscriber; |
| “key pair”, in an asymmetric cryptosystem, means a private key and its mathematically related public key, having the property that the public key can verify a digital signature that the private key creates; |
| “private key” means the key of a key pair used to create a digital signature; |
| “public key” means the key of a key pair used to verify a digital signature; |
| “registered surveyor” has the meaning given by the Land Surveyors Act 1991; |
| “signature” includes any symbol executed or adopted, or any methodology or procedure employed or adopted, by a person with the intention of authenticating a record, including electronic or digital methods; |
| “subscriber” means a registered surveyor who is the subject named or identified in a certificate issued to him or her by an approved certification authority and who holds a private key that corresponds to a public key listed in that certificate; |
“verify a digital signature”, in relation to a given digital signature, record and public key, means to determine accurately that —| (a) | the digital signature was created using the private key corresponding to the public key listed in the certificate; and | | (b) | the record has not been altered since its digital signature was created. |
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