What is a block cipher?
Cipher block is a symmetrical cryptographic algorithm used to twitch sensitive data. Programs or algorithms that actually perform the task of hiding data are called ciphers. SCRAMBLING or data encryption provides additional benefits in addition to secrets. Encryption can also ensure that the message is not changed and also verify the sender's identity.
Cryptography is a science of how to rotate readable unencrypted data, called Plaintext, to encrypted data, called Ciphertext. Block ciphers differ from another main category of symmetrical algorithms, a cipher current, as they encrypt the data into pieces or blocks instead of one character at a time. The block cipher is generally considered safer than the current cipher because it is more random, while the current cipher works faster when the simple text is short.
The concept of a symmetrical block cipher comes from the actual encryption data process. Symmetrical cryptography, also called the private key Cryptography, uses to encrypt and decrypt data onlyThe key. It is essential that the key remains private because everyone who has can read any message that is sent. This is, unlike asymmetric cryptography that uses two keys, a private key that is provided and a public key that is available to everyone.
The use of cryptography dates back to many centuries and was present in ancient Egypt and Rome. Julius Caesar has used what is now well known as the Caesar cipher to give secret news to its generals. Cryptographic systems are constantly attacked and because old algorithms are disrupted, cryptographers develop new reports for hiding messages. Some popular versions of block ciphers include the data encryption standard, advanced encryption (AES) standard and data encryption algorithm.
DES is a known conventional block cipher that uses a 56 -bit symmetrical key. They are encrypted in 64 -bit blocks. Every timeDES encrypts the 64 -bit Plaintext block, passes through the algorithm 16 times or wheels. Due to the short 56 -bit key, the desing is no longer safe for many applications.
AES was selected in October 2000 by the National Institute for Standards and Technologies (NIST) as a safer replacement for des. AES uses three different keys to perform multiple wheels of 128 bits. Key sizes are 128, 192 and 256 bits in length.
Another block of cipher is an idea that is widely used in Europe and uses a 128 -bit key to perform eight rounds of encryption on 64 -bit blocks of simple text. The idea was created in 1992 by James Massey and Xuejia Lai on the basis of a research contract with a Swedish technology foundation. Although the idea has been developed with private grants, it is free of charge for non -commercial use.