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Shooting at your widest f-stop will aid you in your endeavors, allowing you to also do this as well as affording you the ability to shoot at the fastest possible shutter speed for your chosen ISO..

Stored passwords should be protected such that only the password mechanism(s) is authorized access to a password. Examples include:

Most systems have a password file that can be legitimately read only by the log-on process Some systems separate the password file from the authorized user file Some systems encrypt passwords, either reversibly (two-way) or irreversibly (one-way) using a data encrypting key. Passwords that are encrypted before they are stored should be protected from substitution that is, protection should be provided such that one encrypted password cannot be replaced with another unless the replacement is authorized.

FIGURE 7.4 Following the violation of its trendline, Yahoo collapsed, losing almost its entire value.

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10. Transmission. Transmission is the set of acceptable methods for communicating a password from its point of entry to its point of comparison with a stored, valid password. Consider the following good practice: Passwords that are transmitted between the place of entry and the location for comparison against a stored password should be protected to the degree specified by the security officer, and at least equivalent to the protection required for the entities, such as the system or its data, that the password is protecting. Passwords used as encryption keys should be selected at random from the set of all possible keys (for example, 236 keys for the Data Encryption Standard) and used either as data-encrypting keys or key-encrypting keys, but not both. Unencrypted passwords should be transmitted as ASCII characters if interchanged between systems, while encrypted passwords and virtual passwords should be transmitted either as 64-bit binary fields, or as the ASCII representations of the hexadecimal character set [0-9, A-F].

Discussion: Evolution in password thinking As noted in [Smith2002], the classical password selection rules can be summarized as follows: the password must be impossible to remember and never written down. This illustrates the limitation of passwords as authenticators, and is compounded by the large number of passwords typically needed by a single individual-for example, for different computers, networks, and Web sites. It can be argued that the set of passwords that simultaneously conform to all the classic rules is a null set. Because of this limitation, and because of the trend toward more network use, the prohibition against

6.4 In many venues, uncluttered or smooth backgrounds are hard to nd. I decided to use a camera angle that diminished the background and used the striped track lines to frame my subject, long-distance runner Ian Reschke. Taken at ISO 500, f/2.8, 1/4000 second with a 15.2mm lens setting.

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FIGURE 7.5 Here is the SPY over a period close to a decade. Its ascending trendline was intact from 1994 through 2000, but once it was violated, the fall that followed was severe.

Identification and Authentication (I&A)

writing down passwords is being reconsidered. The risk of having passwords compromised on the network has increased to the point where it significantly outweighs the risks of local compromise, that is, writing down passwords. One password guide [Geodsoft2002b] recommends recording sensitive passwords and protecting the recorded passwords, especially root or administrator passwords. This guidance may also apply when one person must remember a significant number of passwords. For example, multiple passwords could be stored and protected on a USB token.

[NIST800-63] defines four levels of assurance for authentication. Level 1 allows password challenge-response protocols, and does not require cryptographic methods. Level 2 allows passwords, but requires a secure authentication protocol and the use of cryptographic techniques. Level 3 requires at least two authentication factors, of which one can be a one-time password. Level 4 also requires multi-factor authentication, but does not allow passwords: both factors must be physical cryptographic tokens.

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