misspelledsearch.com:

encryption algorithm

information page

If you cannot find the information you are searching for on this page, we suggest searching Google with the correct spelling "encryption algorithm":

This article is about algorithms for encryption and decryption. For an overview of cryptographic technology in general, see cryptography. For the movie, see Encrypt (film).

In cryptography, encryption is the process of obscuring information to make it unreadable without special knowledge. While encryption has been used to protect communications for centuries, only organizations and individuals with an extraordinary need for secrecy had made use of it. In the mid-1970s, strong encryption emerged from the sole preserve of secretive government agencies into the public domain, and is now employed in protecting widely-used systems, such as Internet e-commerce, mobile telephone networks and bank automatic teller machines.

Encryption can be used to ensure secrecy, but other techniques are still needed to make communications secure, particularly to verify the integrity and authenticity of a message; for example, a message authentication code (MAC) or digital signatures. Another consideration is protection against traffic analysis.

Encryption or software code obfuscation is also used in software copy protection against reverse engineering, unauthorized application analysis, cracks and software piracy used in different encryption or obfuscating software

Ciphers

A cipher is an algorithm for performing encryption (and the reverse, decryption) — a series of well-defined steps that can be followed as a procedure. An alternative term is encipherment.

The original information is known as plaintext, and the encrypted form as ciphertext. The ciphertext message contains all the information of the plaintext message, but is not in a format readable by a human or computer without the proper mechanism to decrypt it; it should resemble random gibberish to those not intended to read it.

The operation of a cipher usually depends on a piece of auxiliary information, called a key or, in traditional NSA parlance, a cryptovariable. The encrypting procedure is varied depending on the key, which changes the detailed operation of the algorithm. A key must be selected before using a cipher to encrypt a message. Without the same key, it should be difficult, if not impossible, to decrypt the resulting ciphertext into readable plaintext.

"Cipher" is alternatively spelled "cypher"; similarly "ciphertext" and "cyphertext", and so forth. The word descends from the Arabic word for zero: ṣifr or صِفْر, like (the Italian) zero (which remained in use for 0, the crucial innovation in positional Arabic versus Roman numerals) but soon was used for any decimal digit, even any number. While it may have come to mean encoding because that often involved numbers, a theory says conservative Catholic opponents of the Arabic (heathen) numerals equated it with any 'dark secret'.

Ciphers versus codes

Main article: Code (cryptography)

In non-technical usage, a "(secret) code" is the same thing as a cipher. Within technical discussions, however, they are distinguished into two concepts. Codes work at the level of meaning — that is, words or phrases are converted into something else. Ciphers, on the other hand, work at a lower level: the level of individual letters, small groups of letters, or, in modern schemes, individual bits. Some systems used both codes and ciphers in one system, using superencipherment to increase the security.

Historically, cryptography was split into a dichotomy of codes and ciphers, and coding had its own terminology, analogous to that for ciphers: "encoding, codetext, decoding" and so on. However, codes have a variety of drawbacks, including susceptibility to cryptanalysis and the difficulty of managing a cumbersome codebook. Because of this, codes have fallen into disuse in modern cryptography, and ciphers are the dominant technique.

Types of cipher

There are a variety of different types of encryption. Algorithms used earlier in the history of cryptography are substantially different from modern methods, and modern ciphers can be classified according to how they operate and whether they use one or two keys.

Historical pen and paper ciphers used in the past are sometimes known as classical ciphers. They include substitution ciphers and transposition ciphers. During the early 20th century, more sophisticated machines for encryption were used, rotor machines, which were more complex than previous schemes.

Encryption methods can be divided into symmetric key algorithms (Private-key cryptography) and asymmetric key algorithms (Public-key cryptography). In a symmetric key algorithm (e.g., DES and AES), the sender and receiver must have a shared key set up in advance and kept secret from all other parties; the sender uses this key for encryption, and the receiver uses the same key for decryption. In an asymmetric key algorithm (e.g., RSA), there are two separate keys: a public key is published and enables any sender to perform encryption, while a private key is kept secret by the receiver and enables only him to perform decryption.

Symmetric key ciphers can be distinguished into two types, depending on whether they work on blocks of symbols of fixed size (block ciphers), or on a continuous stream of symbols (stream ciphers).

Key size and vulnerability

In a pure mathematical attack (ie, lacking any other information to help break a cypher), three factors above all, count:

• Mathematical advances, that allow new attacks or weaknesses to be discovered and exploited.
• Computational power available, ie the computer power which can be brought to bear on the problem.
• Key size, ie the size of key used to encrypt a message. As the key size increases, so does the complexity of brute search to the point where it becomes infeasible to crack encryption directly.

Since the desired effect is computational difficulty, in theory one would choose an algorithm and desired difficulty level, thus decide the key length accordingly.

An example of this process can be found at which uses multiple reports to suggest that a symmetric cypher with 128 bits, an assymetric cypher with 3072 bit keys, and an ellyptic curve cypher with 512 bits, all have similar difficulty at present.

See also

• Famous ciphertexts
• Private-key cryptography (symmetric key algorithm)
• Public-key cryptography (asymmetric key algorithm)

External links

• An Introduction to the Use of Encryption
• SecurityDocs Resource for Encryption Whitepapers
• Encryption Algorithms
• Freeware Encryption Software
• RSA Encryption
• Encryption Forum
• SecureStandard Directory of Encryption Whitepapers
• Code Cracker Cracks many classic encryption codes (up to the 20th century)

This encryption algorithm index site has been developed to help wayward users find the information they are looking for, no matter how they are mistakenly spelled or mistyped. This site is designed to help users find encryption algorithm information for the following query variants:

encryption	encryption algorthm	encryption algoithm	encryption algoritm
encryption algrithm	encryption alorithm	encryption agorithm	encryption algorihm
encryption argorithm	encryption algolithm	encryption argolithm	encryption aigorithn
encryption algorlthn	encryption algorithn	encryption algoritmh	encryption algorihtm
encryption algortihm	encryption algoirthm	encryption algroithm	encryption alogrithm
encryption aglorithm	encryption lagorithm	encryption algorith	encryption lgorithm
algorithm	enclyptiom algorithm	ecryption algorithm	enryption algorithm
encyption algorithm	encrption algorithm	encrytion algorithm	encrypion algorithm
encryptin algorithm	encryptiom algorithm	iegncrypsion algorithm	iegnclyppedion algorithm
eigncrypsion algorithm	eignclyppedion algorithm	encryppedion algorithm	iegnclypsion algorithm
iegncrypchon algorithm	eignclypsion algorithm	eigncrypchon algorithm	enclyppedion algorithm
iegncryptiom algorithm	iegnclypchon algorithm	eigncryptiom algorithm	eignclypchon algorithm
encrypchon algorithm	iegnclyptiom algorithm	iegncrypchun algorithm	eignclyptiom algorithm
eigncrypchun algorithm	enclypchon algorithm	iegncrypton algorithm	iegnclypchun algorithm
eigncrypton algorithm	eignclypchun algorithm	encrypchun algorithm	iegnclypton algorithm
iegncrypshon algorithm	eignclypton algorithm	eigncrypshon algorithm	enclypchun algorithm
iegnclypshon algorithm	iegncryption algorithm	eignclypshon algorithm	eigncryption algorithm
iegncrypshun algorithm	iegnclyption algorithm	eigncrypshun algorithm	eignclyption algorithm
iegnclypshun algorithm	iegncryppedion algorithm	eignclypshun algorithm	eigncryppedion algorithm
enclypsion algorithm	encrypton algorithm	encrypshun algorithm	encrypshon algorithm
enclyption algorithm	enclypton algorithm	enclypshun algorithm	enclypshon algorithm
encrypsion algorithm	encryptlon algorithm	emcryption algorithm	encryptino algorithm
encryptoin algorithm	encrypiton algorithm	encrytpion algorithm	encrpytion algorithm
encyrption algorithm	enrcyption algorithm	ecnryption algorithm	necryption algorithm
encryptio algorithm	ncryption algorithm

If you would like to add or correct the content of this site, or if you are interested in supporting the efforts of misspelledsearch.com by placing your product information on these encryption algorithm pages, please contact mistype@gmail.com for details.