OpenStack Cloud Security by Unknown

Author:Unknown
Language: eng
Format: mobi, epub
Publisher: Packt Publishing

As you can see, with one-time pads, you can enable secure cryptography. Although it is unbreakable if correctly implemented, this kind of cipher is not used commonly since it has multiple drawbacks:

The one-time pads have to be composed with truly random characters

The one-time pads have to be exchanged

The one-time pads have to be as long as the total combined length of all messages that are intended to be sent until the next pad exchange

These problems were partially solved by the German Army during World War II with Enigma. Enigma is a machine that encrypts and decrypts a text by identifying the positions of three rotors and a few patches. This allowed the German Army, particularly the U-boats, to have months of valid codes on a few sheets of paper. This obviously was way less secure than the perfect Vigenere cipher; in fact, it was breached during WWII.

After the World War II, a huge number of attempts to create secure encryption were made. We will see them as we go on in the chapter.

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