Patent ID: 8218763
Filing Date: 2012-07-10
Classification: H04L

Abstract:
1. A method for electronically storing and retrieving at a later date a true copy of a document stored on a remote storage device comprising: receiving, at a store entity, a document in electronic format sent from a document owner's computing device to said store entity for storing said document, said store entity remotely located from said computing device; generating, by said store entity, a digest of said document while said document is at said store entity by applying a hash function to the document; adding to said digest a time of expiration for storing said document at said store entity; signing said digest electronically with a key while said document is at said store entity; generating a receipt that includes said signed digest and said time of expiration; sending, by said store entity, a copy of said receipt to said document owner; verifying, at the document owner's computing device, that the received receipt corresponds to the document sent from the owner's computing device; and subsequently renewing, by said document owner, the receipt to extend said time of expiration for storing said document, said store entity sending said renewed receipt to said owner's computing device.