147 lines
4.9 KiB
Markdown
147 lines
4.9 KiB
Markdown
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Like this project? Consider tipping me: [https://github.com/sponsors/bartobri](https://github.com/sponsors/bartobri)
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No More Secrets
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===============
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This project provides a command line tool called `nms` that recreates the
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famous data decryption effect seen on screen in the 1992 hacker movie Sneakers.
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For reference, you can see this effect at 0:35 in [this movie clip](https://www.youtube.com/watch?v=F5bAa6gFvLs&t=35).
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This command works on piped data. Pipe any ASCII or UTF-8 text to `nms`,
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and it will apply the Hollywood effect, initially showing encrypted data,
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then starting a decryption sequence to reveal the original plain-text characters.
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Also included in this project is a program called `sneakers` that recreates
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what we see in the above movie clip. Note that this program requires the
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user to select one of the menu options before it terminates.
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By default, this project has no dependencies, but it does rely on ANSI/VT100
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terminal escape sequences to recreate the effect. Most modern terminal
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programs support these sequences so this should not be an issue for most
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users. If yours does not, this project also provides a ncurses implementation
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which supports non-ANSI terminals, but at the expense of losing the inline
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functionality (ncurses will always clear the screen prior to displaying output).
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Table of Contents
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-----------------
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1. [Download and Install](#download-and-install)
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2. [Usage](#usage)
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3. [The NMS Library](#the-nms-library)
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4. [License](#license)
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Download and Install
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--------------------
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More and more Unix/Linux platforms are including this project in their
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package manager. You may wish to search your package manager to see if it
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is an installation option. If you install from a package manager, please
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check that you have the latest version (`nms -v`). If not, I suggest
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installing from source by following the instructions below.
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To install this project from source, you will need to have the tools `git`,
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`gcc`, and `make` to download and build it. Install them from your package
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manager if they are not already installed.
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Once you have the necessary tools installed, follow these instructions:
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#### Install:
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```
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$ git clone https://github.com/bartobri/no-more-secrets.git
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$ cd ./no-more-secrets
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$ make nms
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$ make sneakers ## Optional
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$ sudo make install
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```
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#### Uninstall:
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```
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$ sudo make uninstall
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```
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#### Install with Ncurses Support
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If your terminal does not support ANSI/VT100 escape sequences, the effect
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may not render properly. This project provides a ncurses implementation
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for such cases. You will need the ncurses library installed. [Install this
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library from your package manager](NCURSES.md). Next, follow these instructions:
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```
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$ git clone https://github.com/bartobri/no-more-secrets.git
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$ cd ./no-more-secrets
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$ make nms-ncurses
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$ make sneakers-ncurses ## Optional
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$ sudo make install
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```
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Usage
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-----
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`nms` works on piped data. Pipe any ASCII or UTF-8 characters to it and
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enjoy the magic. In the below examples, I use a simple directory listing.
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```
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$ ls -l | nms
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$ ls -l | nms -a // Set auto-decrypt flag
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$ ls -l | nms -s // Set flag to mask space characters
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$ ls -l | nms -f green // Set foreground color to green
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$ ls -l | nms -c // Clear screen
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$ nms -v // Display version
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```
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Note that by default, after the initial encrypted characters are displayed,
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`nms` will wait for the user to press a key before initiating the decryption
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sequence. This is how the it is depicted in the movie.
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#### Command Line Options
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`-a`
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Set the auto-decrypt flag. This will automatically start the
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decryption sequence without requiring a key press.
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`-s`
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Set a flag to mask space characters. This will only mask single blank space
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characters. Other space characters such as tabs and newlines will not be masked.
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`-f <color>`
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Set the foreground color of the decrypted text to the color
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specified. Valid options are white, yellow, black, magenta, blue, green,
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or red. This is blue by default.
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`-c`
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Clear the screen prior to printing any output. Specifically,
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it saves the state of the terminal (all current output), and restores it
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once the effect is completed. Note that when using this option, `nms` requires
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the user to press a key before restoring the terminal.
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`-v`
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Display version info.
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The NMS Library
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---------------
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For those who would like to use this effect in their own projects, I have
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created a C library that provides simple interface and can easily be used
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for any program that runs from the command line.
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See [LibNMS](https://github.com/bartobri/libnms) for more info.
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License
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-------
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License. See [LICENSE](LICENSE) for
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more details.
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