Patent ID: 8392703
Filing Date: 2013-03-05
Classification: H04L

Abstract:
1. An electronic signature verification method, employing a secret key infrastructure (SKI) to act as a secret key registration center and a signature verification key issuance center, and a trusted third party to act as a signature verification center, and the method processing a document signed by a signer computer, and comprising: (a) the signer computer registering a first secret key to the secret key registration center; (b) the signature verification center registering a second secret key to the secret key registration center; (c) the signer computer applying for a signature key and a verification key to the signature verification key issuance center; (d) the signature verification key issuance center encrypting a second packet by the second secret key, and the second packet comprising the verification key; (e) the signature verification key issuance center encrypting a first packet by the first secret key, and the first packet comprising the signature key and the second packet; (f) the signature verification key issuance center transmitting the first packet to the signer computer; (g) the signer computer using the signature key to sign a document to produce a signed document, after decrypting the first packet by using the first secret key; (h) the signer computer transmitting a third packet to a recipient computer, and the third packet comprising the signed document and the second packet; (i) the recipient computer transmitting the signed document and the second packet to the signature verification center; (j) the signature verification center using the verification key to verify whether or not the signed document is valid, after decrypting the second packet by using the second secret key; and (k) the signature verification center returning a verification result to the recipient computer, wherein the secret key registration center, the signature verification key issuance center, and the signature verification center are implemented by computer servers physically separated from each other and the signer computer and the recipient computer are physically separated from each other and physically separated from the computer servers.