Hardware Protection Against Software Piracy

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Presentation transcript:

Hardware Protection Against Software Piracy Published 1984 Tim Maude and Derwent Maude Presented by Mark Noble

Introduction(1) Author’s intent is to discourage piracy by making it more effort than it’s worth Pirates might Duplicate for friends (copying) Copy for resale (counterfeiting) Discover algorithms (reverse engineering) Proposed System designed for protection against (1) and to a degree (2)

Introduction (2) The authors give details on the Hardware aspect of the security unit Software aspect of the security unit Encryption algorithm for protecting the software Execution of the protected software Possible methods of attack

Security Unit Consists of RAM, ROM and a CPU Functions are decryption, runtime instruction execution and runtime control Security Unit’s Private Key is coded into the ROM Decryption SU Key RT control CPU RAM

Software Preparation Software Software is protected by Segmenting the code Randomly reordering the segments Move Runtime path control into the Security Unit Encrypt software with vendor’s public key Encrypt Vendor’s Private Key with Security Unit’s public key RT control Encoded SW

Software Startup On Startup, Vendor’s Private Key is decrypted using the Security Unit’s private key Decoded Key moved to RAM Decryption SU Key Encoded SW RAM

Runtime Execution During runtime, instructions are passed to the Security Unit, decrypted using the Vendor’s Private Key and then executed If required, results are passed back Decryption Encoded SW CPU RAM

Runtime Control Branch and case statement decisions are made in the runtime controller At the end of each code segment, the Security Unit’s runtime controller is called to determine which segment is executed next RT control Encoded SW CPU RAM

Conclusion Basic ideas of the paper are good but the hardware, software and cryptography need to be updated Hardware protection makes hacking an order of magnitude more difficult The protection suggested in this paper is adequate for an average person (“Duplicating for a friend” and possibly “Copy for Resale” ), but, in my opinion, it will not stop a determined hacker Q How much more secure is a hardware and software combination compared with software only?