AES encryption
There are two basic types of encryption; asymmetrical and symmetrical. Asymmetrical uses two keys; a public and a private key. The public and the private keys have unique characteristics. In asymmetric encryption you can encrypt with a public key that has a matching private key used for decryption. The other basic type of encryption is called symmetric encryption; the main difference between the two is that symmetrical encryption uses only one key; a private key used for both encryption and decryption.
Asymmetric encryption is used when there are two end points, such as a VPN client communicating with a VPN server. Symmetric encryption is used most commonly when there is only one end point such as a database on a single computer, where you encrypt it before you store it, and you decrypt it to return it. Symmetric is also orders of magnitude fast then Asymmetrical, therefore in database applications where performance is really an issue, symmetrical encryption is most often used.
AES is a symmetrical encryption standard. The Advanced Encryption Standard, or AES is a specification for the encryption of electronic data established by the U.S. National Institute of standards and technology in 2001. It is based on the Rijndael cipher, and was developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen .
AES is based in a design principlae known as a substitution-permutation network, and is fast both in software and hardware (Schneier). Unlike its predecessor DES, AES does not use a Feistel network. AES is a variant of Rijndael which has a fixed block size of 128 bits, and a key size of 128, 192, or 256 bits. By contrast, the Rijndael specification is specified with block and key sizes that may be any multiple of 32 bits, both with a minimum of 128 and a maximum of 256 bits.
AES operates on a 4×4 colum major order matrix of bytes, although some versions of Rijndael have a larger block size and have additional columns in the state. Most AES
Asymmetric encryption is used when there are two end points, such as a VPN client communicating with a VPN server. Symmetric encryption is used most commonly when there is only one end point such as a database on a single computer, where you encrypt it before you store it, and you decrypt it to return it. Symmetric is also orders of magnitude fast then Asymmetrical, therefore in database applications where performance is really an issue, symmetrical encryption is most often used.
AES is a symmetrical encryption standard. The Advanced Encryption Standard, or AES is a specification for the encryption of electronic data established by the U.S. National Institute of standards and technology in 2001. It is based on the Rijndael cipher, and was developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen .
AES is based in a design principlae known as a substitution-permutation network, and is fast both in software and hardware (Schneier). Unlike its predecessor DES, AES does not use a Feistel network. AES is a variant of Rijndael which has a fixed block size of 128 bits, and a key size of 128, 192, or 256 bits. By contrast, the Rijndael specification is specified with block and key sizes that may be any multiple of 32 bits, both with a minimum of 128 and a maximum of 256 bits.
AES operates on a 4×4 colum major order matrix of bytes, although some versions of Rijndael have a larger block size and have additional columns in the state. Most AES
Bibliography: 1. Bruce Schneier, John Kelsey, Doug Whiting, David Wagner, Chris Hall, Niels Ferguson, Tadayoshi Kohno, Mike Stay (May 2000). "The Twofish Team 's Final Comments on AES Selection". 2. Biryukov, Alex; Khovratovich, Dmitry (2009). "Related-key Cryptanalysis of the Full AES-192 and AES-256". 3. "byte-oriented-aes - A public domain byte-oriented implementation of AES in C - Google Project Hosting". Code.google.com. 4. "Efficient software implementation of AES on 32-bit platforms". Lecture Notes in Computer Science. (2003)