Symmetric Key Cryptography

Symmetric Key Cryptography refers to encryption methods in which both the sender and receiver share the same key.  This was the only kind of encryption publicly known until June 1976. Since then other schemes have also emerged on the scene, however, Symmetric Key Cryptography is still one of the most well researched area of this field.   

Symmetric key ciphers are implemented as either block

ciphers or stream ciphers. A block cipher enciphers input in blocks of plaintext as opposed to individual characters, the input form used by a stream cipher.

The Data Encryption Standard (DES) and the Advanced Encryption Standard (AES) are block cipher designs which have been designated cryptography standards by the US government cialis paiement paypal (though DES’s designation was finally withdrawn after the AES was adopted). Despite its deprecation as an official standard, DES (especially its still-approved and much more secure triple-DES variant) remains quite popular; it is used across a wide range of applications, from

ATM encryption to e-mail privacy and secure remote accessStream ciphers, in contrast to the ‘block’ type, create an arbitrarily long stream of key material, which is combined with the plaintext bit-by-bit or character-by-character, somewhat like the one-time pad. In a stream cipher, the levitra bayer uk cheap output stream is created based on a hidden internal state which changes as the cipher operates. That internal state is initially set up using the secret key material. RC4 is a widely used stream cipher. 


CRG, the cryptanalysis of block and stream ciphers is actively being researched by the group members. In addition, the group is also working on the design and analysis of boolean functions.

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