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Storing Secrets on a PDA
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Secrets can also be stored on a PDA or a cell phone. These two types of devices can be considered together because they exhibit the same characteristics with regard to storing secrets. As opposed to some smart cards, in which users have to enter PINs into an untrusted reader, users may be able to have a higher level of trust in a PDA or cell phone that they own. Cell phones have a direct line of communication with the user, and do not require another device to serve as an intermediary to allow the user to enter his PIN. The keypad on the PDA or cell phone is used instead of the keypad on an untrusted reader. PDAs and cell phones also have more memory to store secrets and faster computational speed than smart cards.
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CHAPTER 14 s KEY MANAGEMENT AND EXCHANGE
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The RAM in PDAs and cell phones, however, is typically not tamper-resistant. If an attacker gets ahold of a cell phone, it is much easier for the attacker to open up the device and access the chip containing the memory for the device. Another disadvantage is that a cell phone or PDA is usually larger than most smart cards. Finally, PDAs and phones are just little computers that can serve as a second factor, but can have bugs and software security vulnerabilities of their own. In addition, communication between such devices and other computers may be awkward but simple using wires. Wireless protocols such as Bluetooth can be used, but secure setup and association can be cumbersome.
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Another device that one could consider using for storing secrets is a key disk. A USB or key disk is a device that can attach into the USB port on a PC. A key disk has a set of non-volatile memory that can be used to store the bits of a secret or key. The key disk s biggest advantage is that it serves as a second factor. The key itself will not be on the user s PC, and will require the user to plug in the second factor, the USB key disk. However, most of these disks don t have a CPU that can run arbitrary programs. The device is not tamper-resistant. If an attacker gets ahold of it, he could simply stick the key disk into his PC and start reading the bits on it. In this case, a user could encrypt the bits on the key disk such that a password could be used to decrypt the data. As with smart cards, key disks have the problem of the untrusted reader. Whatever the user is entering the password into can be used to decrypt the bits on the key disk. The password could be potentially captured, and the key disk may not have good support for authentication.
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An external device allows the owner of a key to remove the key from the host system, and maintain physical possession of the device that carries the key. However, all of the options introduced are vulnerable to situations in which the host system the device is connected to has been compromised and is running malicious code. Such malicious code could, for instance, make the user believe that she is providing her key to authorize an intended transaction, but actually causes the key to be used to authorize a modified or entirely different transaction. An important advantage arises from devices where the cryptographic operation (e.g., digital signature) is actually executed on the device, and where the private key material never leaves the device (e.g., smart cards or HSMs). If the device is connected to a compromised host, the attacker s malicious code may be able to use the device to perform cryptographic operations with the user s key while it is connected. However, unlike in the case of a key disk, the malicious code cannot extract the key and continue using it after the device has been disconnected again.
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