Arcfour and CipherSaber

This is my implementation of RC4 algorithm and CipherSaber.

You may run some functional tests with:

make check

Also, you may build the project with:

make

Arcfour

To cipher a file with RC4, you need a (hopefully secret) key stored in a file. arcfour program will cipher or decipher the stdin and write the result to stdout.

For example:

echo -n "Secret" > my.key       # my secret key
echo -n "Attack at dawn" | ./arcfour my.key > message.rc4       # The encrypted message

To decipher, you need the same key:

./arcfour my.key < message.rc4

CipherSaber

To cipher with CipherSaber, you need a secret key again. But this time, first parameter is cipher or decipher.

echo -n "Attack at dawn" | ./saber1 cipher my.key > message.cs

Then, if you want to decipher the message:

./saber1 decipher my.key < message.cs

Creating a key

There is a lot of ways to create a secret key. You may use a passphrase or a random stream of bytes.

This is a way to create a secret key with 128 bytes long:

head -c 128 < /dev/urandom > my.key
chmod 400 my.key