asymmetric cryptosystem - определение. Что такое asymmetric cryptosystem
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Что (кто) такое asymmetric cryptosystem - определение

CRYPTOSYSTEM THAT USES BOTH PUBLIC AND PRIVATE KEYS
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  • digitally signed]] with Alice's private key, but the message itself is not encrypted.
1) Alice signs a message with her private key.
2) Using Alice's public key, Bob can verify that Alice sent the message and that the message has not been modified.
  • keys]] suitable for use by an asymmetric key algorithm.
  • In an asymmetric key encryption scheme, anyone can encrypt messages using a public key, but only the holder of the paired private key can decrypt such a message. The security of the system depends on the secrecy of the private key, which must not become known to any other.
  • symmetric cipher]] which will be, in essentially all cases, much faster.

Asymmetric warfare         
  • kg}} in size.
  • IED]] in [[Northern Ireland]] removed from culvert in 1984
  • Improvised [[molotov cocktail]]s
  • the War]] on display at Clark [[Museum]]
WAR BETWEEN BELLIGERENTS WHOSE RELATIVE MILITARY POWER DIFFERS SIGNIFICANTLY
Asymmetrical warfare; Asymmetric war; Asymmetric attack; Aysmmetric warfare; Asymmetric engagement; Asymetric warfare; Assymetric warfare; Asynchronous warfare; Asymetrical warfare; Assymetrical warfare; Asymmetric conflicts; Asymmetric conflict; Asymmetrical war; Asymmetrical conflict; Asymmetrical fighting; Symmetric warfare; Asymmetric Warfare
Asymmetric warfare (or asymmetric engagement) is the term given to describe a type of war between belligerents whose relative military power differs significantly, or whose strategy or tactics differ significantly. This is typically a war between a standing, professional army and an insurgency or resistance movement militias who often have status of unlawful combatants.
asymmetrical warfare         
  • kg}} in size.
  • IED]] in [[Northern Ireland]] removed from culvert in 1984
  • Improvised [[molotov cocktail]]s
  • the War]] on display at Clark [[Museum]]
WAR BETWEEN BELLIGERENTS WHOSE RELATIVE MILITARY POWER DIFFERS SIGNIFICANTLY
Asymmetrical warfare; Asymmetric war; Asymmetric attack; Aysmmetric warfare; Asymmetric engagement; Asymetric warfare; Assymetric warfare; Asynchronous warfare; Asymetrical warfare; Assymetrical warfare; Asymmetric conflicts; Asymmetric conflict; Asymmetrical war; Asymmetrical conflict; Asymmetrical fighting; Symmetric warfare; Asymmetric Warfare
¦ noun warfare involving surprise attacks by small, simply armed groups on a nation armed with modern high-tech weaponry.
public-key cryptography         

Википедия

Public-key cryptography

Public-key cryptography, or asymmetric cryptography, is the field of cryptographic systems that use pairs of related keys. Each key pair consists of a public key and a corresponding private key. Key pairs are generated with cryptographic algorithms based on mathematical problems termed one-way functions. Security of public-key cryptography depends on keeping the private key secret; the public key can be openly distributed without compromising security.

In a public-key encryption system, anyone with a public key can encrypt a message, yielding a ciphertext, but only those who know the corresponding private key can decrypt the ciphertext to obtain the original message.

For example, a journalist can publish the public key of an encryption key pair on a web site so that sources can send secret messages to the news organization in ciphertext. Only the journalist who knows the corresponding private key can decrypt the ciphertexts to obtain the sources' messages—an eavesdropper reading email on its way to the journalist cannot decrypt the ciphertexts. However, public-key encryption does not conceal metadata like what computer a source used to send a message, when they sent it, or how long it is. Public-key encryption on its own also does not tell the recipient anything about who sent a message—it just conceals the content of a message in a ciphertext that can only be decrypted with the private key.

In a digital signature system, a sender can use a private key together with a message to create a signature. Anyone with the corresponding public key can verify whether the signature matches the message, but a forger who does not know the private key cannot find any message/signature pair that will pass verification with the public key.

For example, a software publisher can create a signature key pair and include the public key in software installed on computers. Later, the publisher can distribute an update to the software signed using the private key, and any computer receiving an update can confirm it is genuine by verifying the signature using the public key. As long as the software publisher keeps the private key secret, even if a forger can distribute malicious updates to computers, they cannot convince the computers that any malicious updates are genuine.

Public key algorithms are fundamental security primitives in modern cryptosystems, including applications and protocols which offer assurance of the confidentiality, authenticity and non-repudiability of electronic communications and data storage. They underpin numerous Internet standards, such as Transport Layer Security (TLS), SSH, S/MIME and PGP. Some public key algorithms provide key distribution and secrecy (e.g., Diffie–Hellman key exchange), some provide digital signatures (e.g., Digital Signature Algorithm), and some provide both (e.g., RSA). Compared to symmetric encryption, asymmetric encryption is rather slower than good symmetric encryption, too slow for many purposes. Today's cryptosystems (such as TLS, Secure Shell) use both symmetric encryption and asymmetric encryption, often by using asymmetric encryption to securely exchange a secret key which is then used for symmetric encryption.