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Education for all
There are two main types of encryption: asymmetric encryption (also known as public-key encryption) and symmetric encryption. There are many algorithms for encrypting data based on these types. Some of the most common are listed below:
• Skipjack – uses an 80-bit key and was designed to run on “tamper-proof” hardware.
• Data Encryption Standard (DES) – uses a 56-bit key to encrypt the data. DES is now considered to be insecure for many applications. This is chiefly due to the 56-bit key size being too small; DES keys have been broken in less than 24 hours.
• Triple-DES – uses three successive DES operations to provide stronger encryption than DES. The algorithm is believed to be practically secure, although it is theoretically susceptible to some attacks. In recent years, Triple-DES has been superseded by the Advanced Encryption Standard (AES).
• Advanced Encryption Standard (AES) – also known as Rijndael, it can use 128, 192 or 256-bits to encrypt and decrypt data in blocks of 128-bits. As of 2004, there have been no successful attacks against AES.