CHARLIE (thoughtfully) We could apply frequency-domain processors. Larry can help, he worked with the NSA on noise analysis...

This Demonstration creates a white-noise sequence and then uses a low-pass filter to produce a red-noise sequence. The "filter cut-off" is
the fractional point in [0, 1] on the spectral frequency axis to apply the filter, as measured from zero frequency. The rate of suppression
of frequencies larger than the filter cut-off is given by the "filter roll-off" exponent *n* (1 to 4); larger values of *n* mean greater suppression
of the higher frequencies. A new time sequence is generated with the "randomize" button. The amplitude spectrum of the time series is plotted
simultaneously, with spectral values on a log scale, out to the Nyquist frequency.

Where one computer shows the restaurant's plain password request page, and another is filled with computer code, which the FBI has started to decipher. DON Amita, that's the restaurant's computer hard drive... AMITA Multi-layer encryption... DON Our techs could crack it -- but you're faster and I don't have a lot of time.

The RSA cryptosystem was invented by R. Rivest,
A. Shamir, and L. Adleman. This Demonstration
1) generates a large RSA modulus *n* (up to 700 decimal digits);
2) creates the corresponding public and private keys, *e* and *d*;
3) provides a simple, practical way to encrypt and decrypt messages in various UNICODE supported languages.

CHARLIE (cont'd) Same in audiology. We shrink sounds we don't want so the sound we do want becomes foreground. LARRY We use filters to diminish or blur noise -- identifying each unwanted sound by its frequency, then discriminating against it.

The geometric mean filter is a member of a set of nonlinear filters that are used to
remove Gaussian noise. It operates by replacing each pixel by the geometric mean of the values in its neighborhood.

LARRY (intrigued) Or under the squares. (tries some keys) Like a dragon hiding in its lair. Seems Yoon had a thing for numbers 8 and 9. AMITA I've tried every number, and every combination of number.

After selecting the colors using the controls, imagine that one color is picked at random from each disk. The order of the combination of colors
is not important; for example, red, blue, orange is considered the same combination as red, orange, blue.