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{{r|Plaintext}}

...cal keys used for a short period of time or a certain number of units of [[plaintext]]. ...Only an authorized user in possession of the decryption key can access the plaintext protected by the cryptosystem. For bilateral communications, there must be

Ciphers apply an algorithm and a [[cryptographic key]] to [[plaintext]] in the form of digitally encoded information; the process of encryption i ...lationship between plaintext and ciphertext. Padding that was mistaken for plaintext has changed the course of [[World War II, Pacific#Center: Action off Samar|

...th only an 8 bit block size. Assume the enemy is able to get or guess some plaintext; he makes a little table, his own "code book" showing which ciphertext bloc ...equations and solve for the key), a code book attack (collect all possible plaintext/ciphertext pairs) will ''in theory break any block cipher''. However, all o

== Known plaintext == ..."he may read messages he is not supposed to see", does that include known plaintext? [[User:Howard C. Berkowitz|Howard C. Berkowitz]] 14:36, 16 April 2009 (UTC

...cker can quickly immediately eliminate most candidate keys if he knows the plaintext is ASCII. If each block has n bytes, only one key out of 2^8*n wi

...eptible to a [[related-key attack]] which requires 2²³ [[chosen plaintext]]s under a related-key pair, with 2³² time complexity

...' output. For decryption, the process is reversed to turn ciphertext into plaintext, but decryption need not use the same key(s) or algorithms for decryption a ...e that some piece of information could be generated only from the original plaintext. See [[one-way encryption]] for the techniques; some applications are prese

Encrypted voice is a problem unless the SBC is trusted to encrypt, examine plaintext, and encrypt in a new cryptosystem.

* [[code book attack]] — collect all possible plaintext/ciphertext pairs for a [[block cipher]], or the entire pseudorandom stream

...substitution cipher was the [[Caesar cipher]], in which each letter in the plaintext was replaced by a letter some fixed number of positions further down the al ...year 1467, in which different parts of the message (often each successive plaintext letter) are enciphered using a different key. In the polyalphabetic [[Vigen

* [[code book attack]] — collect all possible plaintext/ciphertext pairs for a [[block cipher]], or the entire pseudorandom stream ...r, they require large numbers of [[#Known plaintext | known]] or [[#Chosen plaintext | chosen]] plaintexts, all encrypted with the same key. Re-keying often eno

...ryptographic algorithm, introduces or removes the concealment applied to [[plaintext]] or taken to [[ciphertext]]. This discussion deals with the nature of keys

* [[code book attack]] — collect all possible plaintext/ciphertext pairs for a [[block cipher]], or the entire pseudorandom stream ...r, they require large numbers of [[#Known plaintext | known]] or [[#Chosen plaintext | chosen]] plaintexts, all encrypted with the same key. Re-keying often eno

...oyed. Computer implementations typically use exclusive-or (XOR) to combine plaintext and pad bit-by-bit. ...am cipher]], obtaining U.S. Patent 1,310,719 on a device that took key and plaintext on paper tape in Baudot code and combined them with exclusive OR to produce

...m data, then reverse the combining operation to convert ciphertext back to plaintext. ...make such inferences, that would reveal information on other parts of the plaintext. It should be effectively impossible for an enemy — even with a huge

...although it definitely needs context, such as an article that covers known plaintext as opposed to other methods. As you said, you are thinking "bottom up", as

==== newsletter-plaintext ====

...' output. For decryption, the process is reversed to turn ciphertext into plaintext. ...e that some piece of information could be generated only from the original plaintext. In some cases, it is undesirable for anyone to be able to reverse the proc

Encrypted voice is a problem unless the SBC is trusted to encrypt, examine plaintext, and encrypt in a new cryptosystem.