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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 message, the plaintext, may be first encrypted by traditional means, producing a ciphertext. Then, an innocuous cover text is modified in some way so as to contain the ciphertext, resulting in the stegotext. The letter size, spacing, typeface, or other characteristics of a cover text can be manipulated to carry the hidden message. Only a ...
The advantage of a digital press is that in a single pass through the printer a void pantograph with all the variable data can be printed on plain paper. Copy-evident paper, sometimes marketed as ‘security paper’, is pre-printed void pantograph paper that was usually produced on an offset or flexographic press. The quality of the void ...
One example, ORION, had 50 rows of plaintext alphabets on one side and the corresponding random cipher text letters on the other side. By placing a sheet on top of a piece of carbon paper with the carbon face up, one could circle one letter in each row on one side and the corresponding letter on the other side would be circled by the carbon ...
Here are two text messaging apps that use end-to-end encryption. Once you've downloaded either of these apps to your smartphone, you can also link them to your desktop computers.
The method creates a chain-reaction when a letter is decrypted, this means that after decrypting a word, the letters of that word can be used to decrypt other words. [ 9 ] Depending on the type of cipher, a brute force attack method can be used, which attempts to use all possible keys for the encryption. [ 10 ]
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 ...
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