Diffie-Hellman
Diffie-Hellman is an asymmetric cipher defined in U.S. Patent 4,200,770 in 1977, the same year that IBM’s algorithm was selected as the Data Encryption Standard.
The Diffie-Hellman patent expired on 6 September, 1997.
The Diffie-Hellman algorithm is named after its creators: Whitfield Diffie and Martin Hellman.
ElGamal is a variant of Diffie-Hellman which was invented by Taher Elgamal.
|
|
- Block and Stream Ciphers
Block and Stream Ciphers are two categories of ciphers used in classical cryptography. Block and Stream Ciphers differ in how large a piece of the message is processed in each encryption operation. Block Ciphers Block ciphers encrypt plaintext in chunks. Common block sizes are 64 and 128 bits. Stream Ciphers Stream ciphers encrypt plaintext one [...]...
- Symmetric and Asymmetric ciphers
In a symmetric cipher, both parties must use the same key for encryption and decryption. This means that the encryption key must be shared between the two parties before any messages can be decrypted. Symmetric systems are also known as shared secret systems or private key systems. Symmetric ciphers are significantly faster than asymmetric ciphers, [...]...
- Who Invented the Telephone?
Alexander Graham Bell is commonly credited with the invention of the telephone. Bell filed a patent application for a working telephone on Feb. 14, 1876. Bell’s patent of the telephone has been successfully defended in five hundred and eighty-seven lawsuits, including five that reached the United States Supreme Court. Indeed, Alexander Graham Bell did invent [...]...
- Cryptographic Algorithms
Symmetric Cryptographic Algorithms DES (Data Encryption Standard) is perhaps the most widely used cryptographic algorithm. DES is based upon IBM’s Lucifer algorithm. The NBS (National Bureau of Standards) and the NSA (National Security Agency) adopted DES as a federal standard in 1977. DES is a symmetric cipher with an effective key length of 56 bits. [...]...
- Who Invented the Television?
Who invented the television is a hotly debated question. The invention of the television grew out of the invention of the radio. Since you can easily send sound through the air waves many inventors starting thinking of the possibility of not only sound being sent through the airwaves, but also images. On December 2, 1922, [...]...