Monoalfabeetiliste

Monoalfabeetiliste refers to a type of cipher or encryption method where a simple substitution is applied consistently throughout the plaintext. In a monoalfabeetiliste cipher, each letter in the original alphabet is replaced by a different, fixed letter or symbol from a substitute alphabet. This substitution remains the same for every occurrence of a particular letter within the message. For example, if 'A' is consistently replaced by 'X', every 'A' in the message will become an 'X'. This contrasts with polyalphabetic ciphers, where the substitution can change based on position or a key.

The simplicity of monoalfabeetiliste ciphers makes them relatively easy to understand and implement. However, this simplicity also renders them highly vulnerable to cryptanalysis, particularly frequency analysis. By examining the frequency of the ciphertext characters, an attacker can often deduce the original plaintext letters. This is because the frequency distribution of letters in a natural language (like English) is well-known. For instance, in English, 'E' is the most common letter, followed by 'T', 'A', 'O', etc. A monoalfabeetiliste cipher preserves this frequency distribution, albeit shifted. While historically significant, monoalfabeetiliste ciphers are not considered secure for modern communication. They are often used as educational examples to introduce basic cryptographic concepts.