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Tamper-evident physical devices are common in sensitive computer installations. For example, network cabling can be run down transparent conduits and switches can be located in glass-fronted cabinets, allowing for any unusual device attached to the network tending to stand out in plain view.
Tamperproofing is a methodology used to hinder, deter or detect unauthorised access to a device or circumvention of a security system. Since any device or system can be foiled by a person with sufficient knowledge, equipment, and time, the term "tamperproof" is a misnomer unless some limitations on the tampering party's resources is explicit or assumed.
Anti-tamper software is software which makes it harder for an attacker to modify it. The measures involved can be passive such as obfuscation to make reverse engineering difficult or active tamper-detection techniques which aim to make a program malfunction or not operate at all if modified. [ 1 ]
Static RAM consists of 64 / 96 / 128 KB general purpose, 4 KB battery-backed, 80 bytes battery-backed with tamper-detection erase. Flash consists of 128 / 256 / 512 / 768 / 1024 KB general purpose, 30 KB system boot, 512 bytes one-time programmable (OTP), 16 option bytes. Each chip has a factory-programmed 96-bit unique device identifier number.
A tamper-evident band or security ring serves as a tamper resistant or tamper evident function to a screw cap, lid, or closure. [1] The term tamper-proof is sometimes used but is considered a misnomer given that pilfering is still technically possible. [2] A security band can be integrated with the cap or can be a separate package component.
As technology has advanced, additional data could then be captured, stored, and transmitted to the main computer, and often the metering devices could be controlled remotely. This can include events alarms such as tamper, leak detection, low battery, or reverse flow. Many AMR devices can also capture interval data, and log meter events.
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Fragile watermarks are commonly used for tamper detection (integrity proof). Modifications to an original work that clearly are noticeable, commonly are not referred to as watermarks, but as generalized barcodes. A digital watermark is called semi-fragile if it resists benign transformations, but fails detection after malignant transformations ...