![]() ![]() Symmetric authentication key Symmetric authentication keys are used with symmetric key algorithms to provide assurance of the integrity and source of messages, communication sessions, or stored data. #Master key cryptocurrency verificationPublic signature verification key A public signature verification key is the public key of an asymmetric key pair that is used by a public key algorithm to verify digital signatures, either to authenticate a user's identity, to determine the integrity of the data, for non-repudiation, or a combination thereof. When properly handled, private signature keys can be used to provide authentication, integrity and non-repudiation. ![]() In a key management system, each key should be labeled with one such type and that key should never be used for a different purpose.Īccording to NIST SP 800-57 (Revision 4) the following types of keys exist: Private signature key Private signature keys are the private keys of asymmetric ( public) key pairs that are used by public key algorithms to generate digital signatures with possible long-term implications. This page shows the classification of key types from the point of view of key management. When a shorter crypto-period is designed different key types may be used, such as Data Encryption keys, Symmetric Authentication keys, Private Key-Transport keys, Key-Wrapping keys, Authorization keys or RNG keys. Most other key types are designed to last for long crypto-periods from about one to two years. The latter generally applies to the use of an Ephemeral Key Agreement Key. Long term versus single use Ĭryptographic keys may also have keys that designate they can be used for long-term (static, archived) use or used for a single session (ephemeral). A public key can be sent back and forth between recipients, but a private key remains fixed to one location and is not sent back and forth, which keeps it safe from being intercepted during transmission. Only the receiver, who is in possession of the private key’s corresponding to the public key(encryption only key), has the ability to decode the message. Thus, asymmetric keys are suited for use for transmitting confidential messages and data and when authentication is required for assurance that the message has not been tampered with. With an asymmetric key, the message and/or accompanying data can be sent or received by using a public key however, the receiver or sender would use his or her personal private key to access the message and/or accompanying data. With a symmetric key, the key needs to be transmitted to the receiver where there is always the possibility that the key could be intercepted or tampered with. However, the benefits lay in the fact that an asymmetric algorithm is much more secure than a symmetric key algorithm is. Because multiple keys are used with an asymmetric algorithm, the process takes longer to produce than a symmetric key algorithm would. Keys may also be grouped into pairs that have one private and one public key, which is referred to as an Asymmetric key pair.Īsymmetric versus symmetric keys Īsymmetric keys differ from symmetric keys in that the algorithms use separate keys for encryption and decryption while a symmetric key’s algorithm uses a single key for both processes. ![]() For example, a key might have one of the following properties: Symmetric, Public or Private. These keys are categorized in respect to how they are used and what properties they possess.Ī cryptographic key is categorized according to how it will be used and what properties it has. This analogy provides some insight on how cryptographic key types work. The automobile key will not work to open the safety deposit box and vice versa. ![]() One key might be used to start an automobile, while another might be used to open a safety deposit box. These keys might be various shapes and sizes, but one thing is certain, each will generally serve a separate purpose. Consider a keyring that contains a variety of keys. ![]()
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