System for preventing electronic memory tampering

Details System for preventing electronic memory tampering System for preventing electronic memory tampering

1996-09-05

2000-02-15

Dolinar, Andrew M.

Telecommunications

Radiotelephone system

Security or fraud prevention

455418, 380 4, 380 25, 380 30, 711164, H04L 928, H04L 930, H04Q 732

Patent

active

060262931

ABSTRACT:
Methods and apparatus for preventing tampering with memory in an electronic device, such as a cellular telephone, are disclosed. An electronic device having a memory and a processing means contains logic that is used to perform a one-way hash calculation on the device's memory contents whereby an audit hash value, or signature, of such contents is derived. The audit hash value is compared to a an authenticated valid hash value derived from authentic memory contents. A difference between the audit and valid hash values can be indicative of memory tampering. In accordance with another aspect of the invention, electronic device memory contents can be updated by a data transfer device that is authenticated before being permitted access to the memory contents. Data transfer device authentication involves the use of a public/private key encryption scheme. When the data transfer device interfaces with a electronic device and requests memory access, a process to authenticate the data transfer device is initiated.

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