Protection of secure electronic modules against attacks

Details Protection of secure electronic modules against attacks Protection of secure electronic modules against attacks

2011-05-31

2011-05-31

Orgad, Edan (Department: 2439)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S192000, C713S193000

Reexamination Certificate

active

07953987

ABSTRACT:
A method and apparatus is disclosed for preventing the unintended retention of secret data caused by preferred state/burn-in in secure electronic modules. Sequentially storing the data and its inverse on alternating clock cycles, and by actively overwriting it to destroy it, prevents SRAM devices from developing a preferred state. By encrypting a relatively large amount of secret data with a master encryption key, and storing said master key in this non-preferred state storage, the electronic module conveniently extends this protection scheme to a large amount of data, without the overhead of investing or actively erasing the larger storage area.

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