public key cryptography

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Related to Asymmetric encryption: Asymmetric key encryption

public key cryptography

An encryption method that uses a two-part key: one private; the other public. To send an encrypted message to someone, the recipient's public key is used, which can be published anywhere or sent openly via email. When the message arrives, the recipient uses his or her private key, which is always kept secret.

Public key cryptography differs from "secret-key cryptography," which uses the same key to encrypt and decrypt. The advantage of public key cryptography is that the public key can be published anywhere and transmitted in the open. The secret key method requires that both sides use the same key, which obviously cannot be freely published. However, public key cryptography is often used to send the secret key to the receiving end and then exchange data via secret keys. See cryptography.

Digital Signatures Start With the Private Key
To create a digital signature that ensures the integrity of a message, document or other file, the signer's private key is used to encrypt the message digest. To verify the signature, the signer's public key is used to decrypt the signature back into the digest and compare it with a newly generated digest.

In the following example, the woman signs the message first and then entirely encrypts it before sending it. The man decrypts the message first and then verifies the signature. See digital signature.


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References in periodicals archive ?
Our proposed scheme utilizes a combination of symmetric and asymmetric encryption schemes to achieve fully homomorphic properties.
Asymmetric encryption is used in some authentication schemes to protect the identity privacy of the users.
Most variants use RSA asymmetric encryption, but CTB-Locker actually makes use of elliptical curve encryption, which, according to Cisco, still provides the same level of public and private key encryption but uses a different type of algorithm; it also offers lower overhead and the same level of security within a smaller key space.
In contrast, asymmetric encryption has both a public and a private key.
One solution is asymmetric encryption in which there are two related keys--a key pair.
For example, the asymmetric encryption scheme introduced in [2] realized conjunctive, subset, and range queries.
Most security mechanisms are based on Symmetric Encryption or Asymmetric Encryption. In the first the source node encrypts the message using a secret key and the destination node decrypts the message using the same key.
With hackers operating on the inside, attempting to extract data by leveraging legitimate users' access, enterprises must respond with better processes for managing and auditing all means of access to critical data--whether user accounts or the asymmetric encryption keys that are used as credentials by applications and servers.
He begins by introducing the topic and the cryptographic systems used today, then addresses each in turn, with discussion of one-way functions, hash functions, random bit generators, symmetric and asymmetric encryption systems, message authentication codes, pseudorandom bit generators and functions, digital signature systems, key establishment, entity authentication, secure multiparty computation, and key management.
In asymmetric encryption, or "public key" cryptography, different keys are used.

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