What are the types of secret key algorithms?
DES The Data Encryption Standard is an algorithm developed in the mid-1970s. It was turned into a standard by the US National Institute of Standards and Technology (NIST), and was also adopted by several other governments worldwide. It was, and still is, widely used, especially in the financial industry. DES is a block cipher with 64-bit block size. It uses 56-bit keys. This makes it susceptible to exhaustive key search with modern computers and special-purpose hardware. DES is still strong enough to keep most random hackers and individuals out, but it is easily breakable with special hardware by government, criminal organizations, or major corporations. DES is getting too weak, and should not be used in new applications. A variant of DES, Triple-DES (also 3DES) is based on using DES three times (normally in an encrypt-decrypt-encrypt sequence with three different, unrelated keys). The Triple-DES is arguably much stronger than (single) DES, however, it is rather slow compared to some n
