Tamper resistant packaging for information protection in electronic circuitry
First Claim
1. A tamper resistant apparatus for detecting intrusion into a region comprising:
- an enclosure being part of and substantially surrounding said region;
energy distribution means including a plurality of paths, each supporting energy distribution, means for changing the condition of the region to any one of a plurality of different conditions by selecting certain of said paths to carry energy and selecting others of the paths not to carry energy;
means for sensing predictable results for said conditions assumed by said region when there is no intrusion into said enclosure and detecting intrusion into said enclosure when results other than said predictable results are sensed, wherein;
said means for sensing predictable results comprises means for sensing the presence and absence of energy on said paths and where an intrusion is detected based on the presence and absence of energy on said paths.
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Abstract
A tamper-resistant package for protecting information stored in electronic circuitry is described. An energy source provides energy (electrical current, optical energy, microwave energy or RF energy, for example) within a region occupied by the circuitry to be protected. The energy is applied to an energy distribution system comprising a path or paths for energy distribution. Sensing means are provided which respond to the distribution system for sensing an intrusion. The distribution system includes an arrangement for changing or altering the path or paths over which the energy travels or altering the topology of the path or paths. The sensing means is informed of the appearance of the distribution system and senses an intrusion by comparing the appearance of the path(s) with the predicted appearance. In one embodiment, electrical current is selectively applied to a subset of electrical conductors. The pattern of current flowing in the conductors is sensed and compared to an expected pattern which is determined by the subset of energized conductors. Intrusion is evidenced by a disparity between the pattern of energized paths sensed by the sensing means compared to the pattern predicted by the sensing means. Dynamically varying the identity of the energized paths makes it difficult for an attacker to bypass the tamper detection.
374 Citations
25 Claims
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1. A tamper resistant apparatus for detecting intrusion into a region comprising:
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an enclosure being part of and substantially surrounding said region; energy distribution means including a plurality of paths, each supporting energy distribution, means for changing the condition of the region to any one of a plurality of different conditions by selecting certain of said paths to carry energy and selecting others of the paths not to carry energy; means for sensing predictable results for said conditions assumed by said region when there is no intrusion into said enclosure and detecting intrusion into said enclosure when results other than said predictable results are sensed, wherein; said means for sensing predictable results comprises means for sensing the presence and absence of energy on said paths and where an intrusion is detected based on the presence and absence of energy on said paths. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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2. A tamper resistant apparatus for protecting information stored in an electronic circuit comprising:
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an enclosure being part of and substantially surrounding a region containing said electric circuit; energy distribution means including a plurality of paths, each supporting energy distribution, means for changing the condition of the region to any one of a plurality of different conditions by selecting certain of said paths to carry energy and selecting others of the paths not to carry energy; means for sensing predictable results for said conditions assumed by said enclsoure when there is no intrusion into said enclosure, and detecting intrusion into said enclosure when results other than said predictable results are sensed, wherein said means for sensing predictable results comprises means for sensing the presence and absence of energy on said paths and where an intrusion is detected based on the presence and absence of energy on said paths; and impairing means for impairing said information contained in said electronic circuit when intrusion is detected by said sensing means. - View Dependent Claims (14, 16)
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17. A tamper resistant apparatus for detecting intrusion into a region comprising:
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(a) means for generating a time sequence of drive signals; (b) a plurality of sensing elements surrounding the region, the sensing elements responsive to a current one of said drive signals for assuming, in absence of intrusion, a particular state in conformity with the current one of the drive signals; (c) means for comparing an actual pattern of states of said sensing elements with a pattern of states predicted from the currant drive signal; and (d) means for detecting intrusion into said region when the actual pattern of states does not match the predicted pattern of states. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification