Theory:

• The Model 100 KeySafe is secured by a list of single use key codes. While this method of security may seem simple, it is also one of the strongest methods of security known to man. A brute force approach attack (IE trying all possible numbers) would take, on average, nearly 10 years, assuming a new number was tried every ten seconds 24 hours a day.


• The keys are stored encrypted inside the safe on a micro SD memory card. This encrypted file contains a million digits scrampled in such a way that even having the file, figuring out the actual keys would be nearly impossible, and likely take years of effort. For a small charge, the SD card can be replaced to create a new list of key codes and responses.


• To further enhance security, each key code has a randomly chosen response. This response takes the form of a pattern of lighted LEDs presented whenever the safe is unlocked. Requiring the user to report what response was displayed, provides an assurance that the user actually opened the safe with the given code, rather than hoading it for a future usage.

Usage:

• Most persons using this type of Keysafe will link it to the website. In this case, the web server will keep track of which code is next. The Keyholder would then use the Keys page to control the wearer's access to the codes. If a printed list is used, the Keyholder can decide when to unlock the safe simply by giving the next code in sequence. The keyholder should then cross off the codes as they are used, so She/He will always know what code to use next for unlocking the safe.


• To add additional security, the Keyholder could watch the safe being opened, the key being used, and then the safe locked back up, via a web cam.


• To improve security even further, you may want to secure the key to the inside of the safe using a piece of wire rope, crimped tightly at both ends. That way, the safe door cannot be closed until the key is placed back inside. Of course, the wire should be long enough for the key to be used to unlock the device.


• The keyholder should insist that the response code be reported each time the safe is unlocked. This is to ensure that the code was actually used, IE not saved for a future use, and to also ensure that the micro SD card was not replaced. If the key codes are stored on the KeySafe web site, the web server will keep track of the responses.


• Please note that the Strict Mistress / Strict Master features of this web site *WILL* work with a Model 100 keysafe, if your codes are placed on this webserver site.

Operation:

• The keypad on the safe is used to enter the Keycode. All KeyCodes are 7-8 digits numbers, and you use the keys 0-9 to enter the code. The green LED will be on solid indicating the safe is ready to accept a code. When the first digit is entered, the green LED will go out and the yellow LED will start blinking. This will indicate the safe has received the first digit and is ready for the other 7 digits. Each time you enter a digit, the safe's buzzer will sound for a very short time, to signal that the digit has been received.


• You have 30 seconds to enter the other 7 digits, if you take longer than that, the safe will reset back to the ready state, with the green LED on while waiting for the first digit. If you make a mistake, hit the "A" key. Hitting this key will let you start over. The "B" key acts as an "enter" key and is not used for an 8 digit number.


• Once you enter all 8 digits, the safe will compare the entered digits with the next KeyCode in sequence. If the digits entered match this code, the safe will display a certain pattern on the LEDs and unlock the safe; you will have 5 seconds to open the door once it unlocks. Note the LED pattern, you will need it in case you Keyholder asks or the web site requires you to enter it. If the code you entered does not match the expected code, the safe will light all 3 LEDs and sound its buzzer for 3 seconds. If you wish, you may then try again once the green LED lights.


• The safe will advance to the next KeyCode in sequence whenever the safe is unlocked. If you are using the web site, the web server will advance to the next code when you correctly enter the LED response to the unlock.

White Papers:

There are two 'white papers' available that describe, in even greater detail, how to setup and operate the Model 100 Keysafe from both a Wearers and from a Holders perspective. These papers were written by a member of this site, who happened to purchase the very first production safe of this model. I encourage everyone who purchases a Model One Safe or manages the keys using one to read these documents carefully.

• White Paper for the Wearer (pdf format)
• White Paper for the Holder (pdf format)

V 1.1a - 01/07/12