El Gamal

A key exchange algorithm useful in situations in which two parties might need to communicate with each other but they have no physical means to exchange key material and there is no public key infrastructure in place to facilitate the exchange of secret keys.
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In cryptography, a sequence of symbols that controls encryption and decryption. For some encryption mechanisms (symmetric), the same key is used for both encryption and decryption; for other mechanisms (asymmetric), the keys used for encryption and decryption are different.
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A form of cryptography that does not use symmetric keys. It either uses complex formulas to solve problems (such as Diffie-Hellman to generate/exchange symmetric keys) or uses key pair sets to provide digital signatures and digital envelopes. This latter form is also known as public key cryptography.
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Encryption of information at its origin and decryption at its intended destination without intermediate decryption. The encryption of information at the point of origin within the communications network and postponing of decryption to the final destination point.
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(1) A public key cryptosystem developed by Rivest, Shamir, and Adleman (RSA). The RSA has two different keys: the public encryption key and the secret decryption key. The strength of RSA depends on the difficulty of the prime number factorization. For applications with highlevel security, the number of the decryption key bits should be greater than 512 bits. RSA is used for both encryption and digital signatures. (2) Resource utilization, resource allocation. See Rivest, Shamir, and Adleman (RSA).
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