The **Beaufort Cipher** is a polyalphabetic substitution cipher that was invented by **Sir Francis Beaufort** in the **19th century**. The cipher is closely related to the **Vigenère Cipher** but works slightly differently. Unlike the **Vigenère Cipher**, the **Beaufort Cipher** uses a reversed encryption and decryption algorithm, which means the ciphertext is produced by reversing the order of the alphabets used in the **Vigenère **method.

# Cipher

The *Autokey Cipher*, invented by **Blaise de Vigenère** in the **16th **century, is a form of polyalphabetic substitution cipher that improves on the traditional *Vigenère cipher* by incorporating the plaintext itself into the key. This cipher was designed to strengthen encryption by reducing repetitive patterns in the key, making it more resistant to frequency analysis. The concept of the *Autokey Cipher* builds on **Vigenère**'s previous work and is part of what’s sometimes called the *Vigenère family* of ciphers.

The *Alberti cipher*, created by **Leon Battista Alberti** in the **15th **century, is recognized as one of the earliest examples of a polyalphabetic substitution cipher. **Alberti**, an Italian Renaissance polymath, developed this cipher as a response to the need for stronger, more secure encryption methods that could withstand frequency analysis, a technique that had become effective against simpler monoalphabetic ciphers.

The *Affine cipher* is a type of substitution cipher rooted in modular arithmetic, which falls under the category of monoalphabetic ciphers. It has origins in classical cryptography, dating back to the use of basic substitution techniques by ancient civilizations. While there isn’t a single, clear creator or exact date for the invention of the affine cipher specifically, it embodies methods commonly attributed to early cipher systems used throughout history, such as by **Roman **and **Greek **scholars.

The *Vigenère Cipher* is a classical cryptographic method that enhances the security of simple substitution ciphers. It was developed by the French diplomat **Blaise de Vigenère** in the **16**th century.

The *Vernam Cipher*, also known as the "*One-Time Pad*," is a powerful and unbreakable encryption technique known for its exceptional security when used correctly. It falls under the category of symmetric encryption, where both the sender and recipient share the same secret key.

The *Trifid Cipher* is a cryptographic technique that combines elements of substitution and transposition ciphers to encrypt messages. It was invented in **1901** by **Félix Delastelle**, a French cryptographer, and is known for its use of three-dimensional representations.

A *Transposition Cipher* is a type of cryptographic method that encrypts messages by rearranging the characters or symbols of the plaintext without altering the original letters themselves. Instead of replacing letters with different symbols (as in substitution ciphers), *transposition cipher*s focus on changing the order of the characters to conceal the message.

The *Templar Cipher* is a cryptographic method associated with the **Knights Templar**, a medieval Christian military order founded during the Crusades. It is one of the many historical ciphers that have been attributed to the **Knights Templar**, although the exact cipher they used remains a subject of debate and speculation.

The *Spiral Cipher* is a method of encrypting messages by arranging the plaintext in a spiral pattern, typically on a grid or matrix. It is a type of transposition cipher, where the original letters of the message are preserved but rearranged in a specific order.