IDTECH SREDKey Manual de usuario

Tech Note #013

SREDKey Tamper Detection

Rev. A

Revised 1/16/2017

International Technologies & Systems Corporation

10721 Walker Street, Cypress, CA 90630-4720; Tel: (714) 761-6368; Fax (714) 761-8880

www.idtechproducts.com

This document is confidential and proprietary, and designed for use by ID TECH

customers only. It may not be reproduced or disseminated without the explicit

permission of ID TECH.

Introduction

ID TECH's SREDKey encrypted keypad is a PCI SRED device, which means (among other

things) it incorporates tamper detection features. This document gives background on

how the tamper detection functionality works and how units can be evaluated in the

field as to their tamper status.

Tamper Trigger State

Once a unit's tamper detection functionality has been triggered in service, the

SREDKey's LCD will display the trigger cause until power-down. Also, the unit will

erase all sensitive data, including cryptographic keys, and enter a deactivated state.

Once deactivation has occurred, each time the unit powers up, its LCD will display

the trigger cause for 5 seconds. Then “Activating…”displays on the LCD, and no

“Ready”message will appear until the unit is repaired and reactivated by the

manufacturer.

The trigger cause will appear in abbreviated form as one of: HTF LTF HVF3 HBF LBF

SDI1 SDI2 HVF1 or VGF. These abbreviations are explained in the table further below.

Note:

When powering on for the first time after triggering tamper, the LCD will

display “Init MSR, please wait... ”for several seconds, then display

the trigger cause for 5 seconds (until that message is erased on purpose);

then “Activating…”displays on the LCD. Because a tamper event causes

all keys and secure data to be lost, the MAXQ processor needs to re-

authenticate with SecureHead, internally. This needs to occur at the factory.

If the battery is off, all of the tamper settings will be lost. So for the first time

power on, the MAXQ will work in user-load mode to set tamper detection,

and the LCD backlight is on but displays nothing. Please re-apply power to

the unit.

There may be one or more reasons for the triggering of a tamper condition;

all appropriate display codes will display on the LCD. If multiple messages

displayed on the LCD, it means several tamper conditions were triggered.

(See below.) Contact your ID TECH representative.

Tamper Trigger Troubleshooting

Various conditions can lead to the triggering of a tamper event. Those conditions (and

the associated abbreviations: HTF, LTF, HVF3, etc.) are outlined in the table below.

Abbreviations

BOR –Battery-on reset (battery attach).

DRS –Destructive reset (that is, reset involving zeroization of secure data).

LCD Display

Tamper Trigger Cause

HTF

High Temperature Flag. When set, this bit indicates that the

enabled (TMPENH = 1) temperature sensor has detected

the chip temperature above +125 C and caused a DRS. The

bit is typically interrogated to determine if a DRS was caused

by the chip’s high temperature when the on-chip

temperature sensor is enabled. (Normally, this is enabled

when the security lock bit is locked by the ROM Loader.) This

flag must be cleared by software once set, otherwise this bit

is unaffected by any other resets except BOR. Setting of this

bit by software will not generate a DRS.

LTF

Low Temperature Flag. When set, this bit indicates that the

enabled (TMPENL = 1) temperature sensor has detected

the chip temperature below -60 C and caused a DRS. It is

typically interrogated to determine if a DRS was caused by

the chip’s low temperature when the on-chip temperature

sensor is enabled. (Normally, this is enabled when the

security lock bit is locked by the ROM Loader.) This flag

must be cleared by software once set, otherwise this bit is

unaffected by any other resets except BOR. Setting of this

bit by software will not generate a DRS.

HVF3

High VDDIO Flag. When set, this bit indicates that the

enabled (HIVOLEN = 1) voltage monitor has detected the

VDDIO has reached above +4V and caused a reset. The flag

is typically interrogated to determine if a reset was caused

by the chip’s high voltage when the voltage monitor is

enabled. (Normally it is enabled when the security lock bit

is locked by the ROM Loader.) This flag must be cleared by

software once set, otherwise this bit is unaffected by any

other resets except BOR. Setting of this bit by software will

not generate a reset.

HBF

High Battery Voltage Flag. When set, this bit indicates that

the enabled (TMPENH = 1) high battery voltage monitor has

detected the battery voltage has reached above +4 V and

caused a DRS. The flag is typically interrogated to determine

if a DRS was caused by the battery voltage being too

high.(Normally it is enabled when the security lock bit is

locked by the ROM Loader.) This flag must be cleared by

software once set, otherwise this bit is unaffected by any

other resets except BOR. Setting of this bit by software will

not generate a DRS.

LBF

Low Battery Voltage Flag. When set, this bit indicates that

the enabled (TMPENL = 1) low battery voltage monitor has

detected the battery voltage has reached below 2.2 V and

caused a DRS. This bit is typically interrogated to determine

if a DRS was caused by the battery voltage being too low.

(Normally it is enabled when the security lock bit is locked

by the ROM Loader.) This flag must be cleared by software

once set, otherwise this bit is unaffected by any other resets

except BOR. Setting of this bit by software will not generate

a DRS.

SDI1

SDI1 Flag. When set, this bit indicates that the external

tamper detection circuitry has been triggered and caused a

DRS by activating SDI1. The flag is typically interrogated to

determine if a DRS was caused by the SDI1. The SDI1 input

can be configured to be a normally open connection

(internal pull down resistor is in effect) or normally closed

connection (internal pull-up resistor is in effect), based

upon the SECNT.SDI1C configuration bit. This flag must be

cleared by software once set, otherwise this bit is

unaffected by any other resets except BOR. Setting of this

bit by software will not generate a DRS or reset

SDI2

SDI2 Flag. When set, this bit indicates that the external

tamper detection circuitry has been triggered and caused a

DRS by activating SDI2. The bit is typically interrogated to

determine if a DRS was caused by the SDI2. The SDI2 input

can be configured to be a normally open connection

(internal pull down resistor is in effect) or normally closed

connection (internal pull-up resistor is in effect) based upon

the SECNT.SDI2C configuration bit. This flag must be cleared

by software once set, otherwise this bit is unaffected by any

other resets except BOR. Setting of this bit by software will

not generate a DRS or reset.

HVF1

High VDDC Flag. When set, this bit indicates that the

enabled (HIVOLEN = 1) voltage monitor has detected the

VDDC voltage has reached above +2.5V and caused a reset.

The flag is typically interrogated to determine if a reset was

caused by the chip’s high voltage when the voltage monitor

is enabled. (Normally enabled when the security lock bit is

locked by the ROM Loader.) This flag must be cleared by

software once set, otherwise this bit is unaffected by any

other resets except BOR. Setting of this bit by software will

not generate a reset.

VGF

Voltage Glitch Failure. When set, this bit indicates that the

enabled (GLIEN = 1) voltage glitch monitor has detected a

1.5V negative/positive glitch from VDDIO or VDDC that

exceeded 20 ns in duration and caused a reset. It is typically

interrogated to determine if a reset was caused by voltage

glitch when the glitch monitor is enabled. This flag must be

cleared by software once set, otherwise this bit is

unaffected by any other resets except BOR. Setting of this

bit by software will not generate a reset.

Tamper Indication

The following photo shows what the LCD looks like when multiple tamper indications

are present:

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