A short-key one-time pad cipher

TL;DR

This paper introduces a multiple-time pad (MTP) cipher that combines the simplicity and security of OTP with the practicality of reusing keys, enabling fast, secure data transmission for high-speed applications.

Contribution

It proposes a novel MTP cipher that uses a set of reusable basic keys and a short keyword for secure, high-speed data transmission, overcoming OTP's key exchange limitations.

Findings

Provides information-theoretic security with reusable keys.

Enables secure high-speed data and multimedia streaming.

Resists known-plaintext attacks through additional design elements.

Abstract

A process for the secure transmission of data is presented that has to a certain degree the advantages of the one-time pad (OTP) cipher, that is, simplicity, speed, and information-theoretically security, but overcomes its fundamental weakness, the necessity of securely exchanging a key that is as long as the message. For each transmission, a dedicated one-time pad is generated for encrypting and decrypting the plaintext message. This one-time pad is built from a randomly chosen set of basic keys taken from a public library. Because the basic keys can be chosen and used multiple times, the method is called multiple-time pad (MTP) cipher. The information on the choice of basic keys is encoded in a short keyword that is transmitted by secure means. The process is made secure against known-plaintext attack by additional design elements. The process is particularly useful for high-speed transmission of mass data and video or audio streaming.