A fiber, a single filament of natural material, such as cotton, linen or wool, or artificial material such as nylon, polyester, metal or mineral fiber, or man made natural fibre like Viscose, Modal & Excel is measured in terms of linear mass density, the weight of a given length of fiber.
The vernam cipher, sometimes known as the 'one time pad', is a stream cipher, which providing certain requirements are met, can be theoretically unbreakable.
Transposition Cipher A transposition cipher changes the position of characters in the plain text message. It is also referred to as an anagram . Substitution Cipher A substitution cipher replaces one set of characters with symbols or another character set. This type of cipher is subject to frequency attacks. Substitution cipher uses the following: A code substitutes hidden words with unrelated terms. A cipher or algorithm is the process or formula used to convert a message or otherwise hide its meaning.