A method for securing original data in a local memory device connectable to a first terminal and a second terminal both having a data link interface, characterized by the following steps performed in the first terminal having the local memory device connected thereto: generating, by a pseudorandom number generator, a first pseudorandom bit stream in response to input of a seed data, dividing the original data to a first portion and a second portion, wherein the second portion is formed by removing from the original data the bits corresponding to selected bits of the pseudorandom bit stream, and the first portion is formed from the remaining bits of the original data, storing the first portion in the local memory device; sending the second portion and said seed data via the data link interface for storage in a remote memory device, removing the local memory device from the first terminal, and the further steps performed in the second terminal upon connecting the local memory device thereto: receiving a read request targeted to the original data, sending to the remote memory device a request for obtaining the second portion and said seed data, retrieving, upon successful access rights authentication of the request at the remote memory device, via the data link interface the second portion and said seed data stored in the remote memory device, combining the first portion stored in the local memory device and the retrieved second portion by placing the bits of the second portion into their original positions among the bits in the first portion in conformity with the selected bits of a second pseudorandom bit stream generated, in the second terminal, in response to input of said data, wherein the combination of the first and second data portions reconstructs the original data when the first and second pseudorandom bit streams are identical. generating, by a pseudorandom number generator, a first pseudorandom bit stream in response to input of a seed data, dividing the original data to a first portion and a second portion, wherein the second portion is formed by removing from the original data the bits corresponding to selected bits of the pseudorandom bit stream, and the first portion is formed from the remaining bits of the original data, storing the first portion in the local memory device; sending the second portion and said seed data via the data link interface for storage in a remote memory device, removing the local memory device from the first terminal, receiving a read request targeted to the original data, sending to the remote memory device a request for obtaining the second portion and said seed data, retrieving, upon successful access rights authentication of the request at the remote memory device, via the data link interface the second portion and said seed data stored in the remote memory device, combining the first portion stored in the local memory device and the retrieved second portion by placing the bits of the second portion into their original positions among the bits in the first portion in conformity with the selected bits of a second pseudorandom bit stream generated, in the second terminal, in response to input of said data, wherein the combination of the first and second data portions reconstructs the original data when the first and second pseudorandom bit streams are identical.