Secure mobile storage

• US 5,442,706 A
• Filed: 02/27/1992
• Issued: 08/15/1995
• Est. Priority Date: 02/27/1992
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Kung, Kenneth C.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US07/842,833
• Time in Patent Office: 1,265 Days
• Field of Search: 380/4, 380/22, 380/23, 380/25, 380/30, 380/49, 380/50, 380/52, 380/24, 235/379, 235/380
• US Class Current: 380/30
• CPC Class Codes: G06F 21/62 Protecting access to data via a platform, e.g. using keys or access control rules
• CPC Class Codes: H04L 9/0894 Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage

Abstract

A method of secure data transfer by physical transport of an electronic storage device wherein the sender, using a type 1 encryption/decryption algorithm, sequentially encrypts data, in any order, with the public key of the receiver and the private key of the sender and then stores then the encrypted data on the transportable electronic storage medium. The receiver, upon receipt of the transportable electronic storage medium, sequentially, in the reverse order of public key/private key use, decrypts using the type 1 encryption/decryption algorithm for said decryption, the data stored on the transportable electronic storage medium with the public key of said sender and the private key of the receiver to provide data in its state prior to by the sender.

Claims

1. A method of ensuring the security of data transferred from a sender to a receiver when said data is to be transported in a transportable electronic storage medium by the physical transport of said electronic storage medium, said sender having a first public key/first private key cryptosystem key pair and said receiver having a second public key/second private key cryptosystem key pair, comprising the steps of:

(a) said sender sequentially encrypting said data with said second public key of the receiver and thereafter with the first private key of the sender and storing said encrypted data on said transportable electronic storage medium, said sender using a type 1 encryption/decryption algorithm for said encryption;

(b) transporting said transportable electronic storage medium from said sender to said receiver;

(c) said receiver sequentially decrypting data stored on the transportable electronic storage medium with the first public key of said sender and thereafter with the second private key of the receiver to provide data in its state prior to encryption in step (a), said receiver using said type 1 encryption/decryption algorithm for said decryption.

2. A method of ensuring the security of data transferred from a sender to a receiver when said data is to be transported in a transportable electronic storage medium by the physical transport of said electronic storage medium, said sender having a first public key/first private key cryptosystem key pair and said receiver having a second public key/second private key cryptosystem key pair, comprising the steps of:

(a) said sender sequentially encrypting said data with said first private key of the sender and thereafter with the second public key of the receiver and storing said encrypted data on said transportable electronic storage medium;

said sender using a type 1 encryption/decryption algorithm for said encryption and decryption

(b) transporting said transportable electronic storage medium from said sender to said receiver;

(c) said receiver sequentially decrypting data stored on the transportable electronic storage medium with the second private key of the receiver and thereafter with the first public key of the sender to provide data in its state prior to encryption in step (a), said receiver using said type 1 encryption/decryption algorithm for said decryption.

3. A method of ensuring the security of data transferred from a sender to a receiver when said data is to be transported in a transportable electronic storage medium by the physical transport of said electronic storage medium, said sender having a first public key/first private key cryptosystem key pair and said receiver having a second public key/second private key cryptosytem key pair, comprising the steps of:

(a) said sender sequentially encrypting said data with said second public key of the receiver and thereafter with the first private key of the sender and storing said encrypted data on said transportable electronic storage medium, said sender using a type 2 encryption/decryption algorithm for said encryption;

(b) transporting said transportable electronic storage medium from said sender to said receiver;

(c) said receiver sequentially decrypting data stored on the transportable electronic storage medium with the first public key of said sender and thereafter with the second private key of the receiver to provide data in its state prior to encryption in step (a), said receiver using said type 2 encryption/decryption algorithm for said decryption.

4. A method of ensuring the security of data transferred from a sender to a receiver when said data is to be transposed in a transportable electronic storage medium by the physical transport of said electronic storage medium, said sender having a first public key/first private key cryptosystem key pair and said receiver having a second public key/second private key cryptosystem key pair, comprising the steps of:

(a) said sender sequentially encrypting said data with said first private key of the sender and thereafter with the second public key of the receiver and storing said encrypted data on said transposable electronic storage medium;

said sender using a type 2 encryption/decryption algorithm for said decryption.

(b) transporting said transportable electronic storage medium from said sender to said receiver;

(c) said receiver sequentially decrypting data stored on the transposable electronic storage medium with the second private key of the receiver and thereafter with the first public key of the sender to provide data in its state prior to encryption in step (a), said receiver using said type 2 encryption/decryption algorithm for said deception.