Vernam Cipher in PHP

A high performance vernam cipher with compression in PHP for encoding and decoding plain texts to cipher text. Used in private messaging, cookies and more.

Credits to the Creator

Vernam cipher, created by Gilber Sandford Vernam (3 April 1890 – 7 February 1960), is a symmetrical stream cipher in which the plaintext is combined with a random or pseudorandom stream of data (the "keystream") of the same length, to generate the ciphertext, using the XOR function. Though sounds simple, it is the only existing mathematically unbreakable encryption, and thus it provides very long-term message secrecy.

Vernam also patented a "Secret Signaling System" in July 22, 1919. The NSA has called this patent "perhaps one of the most important in the history of cryptography." Also, the US Army 1925 SIGTOT teletype system was based on Vernam's machine encipherment concept.

Vernam cipher is also called an unbreakable cipher, as long as the key is kept secret.

How to Use Vcrypt:

Vcrypt sanitizes the text from common code injections and compresses before applying the Vernam Cipher. Thus, provides double security with compression. Average compression for 1500 characters is 48% and processes in <= 0.001ms .

include "vernam-class.php";

$text = "Turning away from the ledge, he started slowly down the mountain, deciding that he would, that very night, satisfy his curiosity about the man-house.";

$key = "f0971dbfe2ca3c75b4dac60f087670f2caa19781057abb432a24daee6c915e93";

Encoding

$res = new Vcrypt($text, $key);

$enc = $res->encode();

echo $enc;

Decoding

$res = new Vcrypt($enc, $key);

$dec = $res->decode();

echo $dec;

How to use (vernam.php):

include "vernam.php";

$key = "b8d285ce189d4e06a884053a4cede2bde6bb81242354b500aac3360a4344a2c0";

$text = "The quick brown fox jumps over the lazy dog.";

$cipher = vernam ( $text, $key ); # Encoding

echo $cipher;

$plain = vernam ( $cipher, $key ); # Decoding

echo $plain;

How to use (vernam-class.php):

include "vernam-class.php";

$text = "A long black shadow slid across the pavement near their feet and the five Venusians, very much startled, looked overhead. They were barely in time to see the huge gray form of the carnivore before it vanished behind a sign atop a nearby building.";

$key = "0c5e096996e96407238d8c02c473844449187d3f98ef618c84a4a316cedce58b";

$res = new Vernam( $text, $key ); # Encoding

$cipher = (string)$res;

echo $cipher;

$res = new Vernam( $text, $key ); # Decoding

$plain = (string)$res;

echo $plain;

Benchmark Performance in a Slow PC

Windows 7 64Bit, 4GB RAM, Dual Core 2Ghz

< 1500 chars in < 0.0009ms

< 5000 chars in < 0.0039ms

< 20000 chars in < 0.0079ms

< 100000 chars in < 0.019ms

< 200000 chars in < 0.079ms

< 400000 chars in < 0.19ms