Understanding the Key Features, Use Cases, and Limitations of ADFGX Cipher | Karthikeyan Nagaraj

Karthikeyan Nagaraj

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Mar 30, 2023

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Introduction:

• In the world of cryptography, the ADFGX cipher is a relatively uncommon yet powerful encryption technique.
• It was used by the German army in World War I to transmit sensitive information securely.
• In this article, we will explore the key features, strengths, weaknesses, and use cases of ADFGX cipher.

Key Features of ADFGX Cipher:

• ADFGX cipher is a polygraphic substitution cipher that replaces pairs of plaintext letters with corresponding pairs of ciphertext letters.
• The cipher derives its name from the use of the five-letter code: A, D, F, G, and X, which are used to rearrange the letters of the plaintext before substitution.
• The cipher also employs a transposition step to further enhance its security by rearranging the order of the ciphertext letters.
• ADFGX cipher uses a keyword as the basis for generating the code table, which is used to substitute the plaintext letters with the corresponding ciphertext letters.
• The key size of ADFGX…