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EP3C5E324A8ES

Cyclone III Device Handbook

Altera Corporation 

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

Design Security

9–71

Security Against Copying

The volatile key is securely stored in the Cyclone III LS device and cannot be read out

through any interfaces. The information of your design cannot be copied because the

configuration file read-back feature is not supported in Cyclone III LS devices.

Security Against Reverse Engineering

Reverse engineering from an encrypted configuration file is very difficult and time

consuming because Cyclone III LS configuration file formats are proprietary and the

file contains million of bits which require specific decryption. Reverse engineering the

Cyclone III LS device is just as difficult because the device is manufactured on the

advanced 60-nm process technology.

Security Against Tampering

Cyclone III LS devices support the following anti-tamper features:

■ Ability to limit JTAG instruction set and provides protection against configuration

data readback over the JTAG port

■ Ability to clear contents of FPGA logic, configuration memory, user memory, and

volatile key

■ Error detection (ED) cycle indicator to core Cyclone III LS devices provide a pass

or fail indicator at every ED cycle and visibility over intentional or unintentional

change of CRAM bits.

f For more information about anti-tamper protection for Cyclone III LS devices, refer to

AN 593: Anti-Tamper Protection for Cyclone III LS Devices.

f For more information about the implementation of secure configuration flow in

Quartus II, refer to AN 589: Using Design Security Feature in Cyclone III LS Devices.

AES Decryption Block

The main purpose of the AES decryption block is to decrypt the configuration

bitstream prior to entering configuration. Prior to receiving encrypted data, you must

enter and store the 256-bit volatile key in the device with battery backup. The key is

scrambled prior to storing it in the key storage to make it more difficult for anyone to

retrieve the stored key using de-capsulation of the device.

Key Storage

Cyclone III LS devices support volatile key programming. Table 9–24 lists the volatile

key features.

Table 9–24. Security Key Features (Part 1 of 2)

Volatile Key Features

Description

Key programmability

Reprogrammable and erasable

External battery

Key programming method (1)

Required

On-board

August 2012 Altera Corporation

Cyclone III Device Handbook

Volume 1

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