Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A terminal for a system requiring secure access, the terminal having means capable of reading data stored in a card or other token, means for entry by the card user of a personal identifier, and means for encyrpting the personal identifier prior to transmission to a checking entity, characterised in that, the personal identifier is encrypted by means of a selected key, that key being transmitted, after encryption using a public key corresponding to a secret key held by the checking entity, along with the encrypted personal identifier.
Claim 2
Dependent Claim
88 words
A terminal for a system requiring secure access, the terminal having means capable of reading data stored in a card or other token, means for entry by the card user of a personal identifier, and means for encyrpting the personal identifier prior to transmission to a checking entity, characterised in that, the personal identifier is encrypted by means of a selected key, that key being transmitted, after encryption using a public key corresponding to a secret key held by the checking entity, along with the encrypted personal identifier.
Claim 3
Dependent Claim
17 words
A terminal according to claim 1 in which the selected key is a random or pseudo-random number.
Claim 4
Dependent Claim
20 words
A terminal according to claim 1 in which the selected key is a second secret key held by the terminal.
Claim 5
Dependent Claim
29 words
A terminal according to claim 2 in which a second secret key held by the terminal is used to encrypt the selected key prior to the public key encryption.
Claim 6
Dependent Claim
39 words
A terminal according to claims 2, 3 or 4 arranged in operation to append to its transmissions a cryptographic checksum of the message generated using the selected key whereby the message content and origin may be verified upon receipt.
Claim 7
Dependent Claim
41 words
A terminal according to claim 2 arranged in operation to append to its transmissions a cryptographic checksum of the message generated using a second secret key held by the terminal whereby the message content and origin may be verified upon receipt.
Claim 8
Dependent Claim
38 words
A terminal according to claim 4 arranged in operation to append to its transmissions a cryptographic checksum of the message generated using said second secret key whereby the message content and origin may be verified upon receipt. -
Claim 9
Dependent Claim
33 words
A terminal according to claims 3, 4, 6 or 7 in which information encrypted by the terminal using a secret key is accompanied by the corresponding (second) public key together with a certificate.
Claim 10
Dependent Claim
27 words
A terminal according to any one of the preceding claims, including means for communication with the card or other token, in which the checking entity is located.
Claim 11
Independent Claim
16 words
A system requiring secure access including a terminal according to any one of the preceding claims.