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Letterlocking is the act of folding and securing a written message (such as a letter) on papyrus, parchment, or paper, without requiring it to be contained in an envelope or packet. It is a traditional method of document security that utilizes folding and cutting. [ 1 ]
A cryptogram is a type of puzzle that consists of a short piece of encrypted text. [1] Generally the cipher used to encrypt the text is simple enough that the cryptogram can be solved by hand. Substitution ciphers where each letter is replaced by a different letter, number, or symbol are frequently used. To solve the puzzle, one must recover ...
This makes it ideal for demonstrating encryption and decryption processes, as it ensures that all letters of the alphabet are included in the example. In a K2 Aristocrat Cipher, the ciphertext alphabet is constructed by placing the keyword at the beginning of the alphabet, followed by the remaining letters in their standard order, omitting ...
The cipher's key is , the number of rails.If is known, the ciphertext can be decrypted by using the above algorithm. Values of equal to or greater than , the length of the ciphertext, are not usable, since then the ciphertext is the same as the plaintext.
Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition. [1] The resulting ciphertext will be impossible to decrypt or break if the following four conditions are met: [2] [3] The key must be at least as long as the plaintext. The key must be truly random.
To use the Vigenère square to encrypt a message, a coder first chooses a keyword to use and then repeats it until it is the same length as the message to be encoded. If LEMON is the keyword, each letter of the repeated keyword will tell what cipher (what row) to use for each letter of the message to be coded. The cipher alphabet on the second ...
The Rail Fence cipher is a form of transposition cipher that gets its name from the way in which it is encoded. In the rail fence cipher, the plaintext is written downward and diagonally on successive "rails" of an imaginary fence, then moves up when it gets to the bottom.
Polygraphic substitution cipher: the unit of substitution is a sequence of two or more letters rather than just one (e.g., Playfair cipher) Transposition cipher: the ciphertext is a permutation of the plaintext (e.g., rail fence cipher) Historical ciphers are not generally used as a standalone encryption technique because they are quite easy to ...