Which encoding techniques could apply to the notes?

Substitution ciphers and transposition ciphers are both important encoding techniques that enhance the security of notes by altering the original information. A substitution cipher works by replacing each letter in the plaintext with a different letter or symbol, which creates a coded message that can be deciphered by someone who knows the key or method of substitution. This method can effectively obfuscate the content of the notes, making it unreadable to unauthorized individuals.

Transposition ciphers, on the other hand, take a different approach by rearranging the letters of the plaintext according to a specific system without changing the letters themselves. This scrambling of the data protects the message from casual observation while still allowing it to be reconstructed by someone knowledgeable about the transposition method used.

Both techniques are fundamental in cryptography and can be applied individually or in combination to strengthen the security of sensitive information. Their versatility makes them ideal for encoding notes in various contexts, allowing for increased confidentiality and integrity of information.

In contrast, relying solely on modern encryption methods would exclude traditional techniques, which still hold relevance in various scenarios. Transposition ciphers alone would not encompass the broader array of security options provided by substitution ciphers. Meanwhile, repetitive frequency patterns do not constitute an encoding technique, as they refer more