dido:public:ra:xapend:xapend.a_glossary:p:public_key
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dido:public:ra:xapend:xapend.a_glossary:p:public_key [2021/08/09 11:50] murphy |
dido:public:ra:xapend:xapend.a_glossary:p:public_key [2022/01/18 11:38] (current) nick |
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| ===== Public Key ===== | ===== Public Key ===== | ||
| - | [[dido:public:ra:xapend:xapend.a_glossary| Return to Glossary ]] | + | [[dido:public:ra:xapend:xapend.a_glossary:start| Return to Glossary ]] |
| - | In [[dido:public:ra:xapend:xapend.a_glossary:c:cryptography|cryptography]], a **Public Key** is a large numerical value that is used to encrypt data. The key can be generated by a software program, but more often, it is provided by a trusted, designated authority and made available to everyone through a publicly accessible repository or directory. | + | ==== Definition 1 ==== |
| + | A **Public Key**(( | ||
| + | Elaine Barker, | ||
| + | NIST, | ||
| + | __Recommendation for Key Management: Part 1 - General__, | ||
| + | NIST Special Publication 800-57 Part 1, Revision 5, | ||
| + | May 2020, | ||
| + | Accessed 18 January 2022, | ||
| + | [[https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57pt1r5.pdf]] | ||
| + | )). | ||
| + | is a cryptographic key used with a **Public Key** [[dido:public:ra:xapend:xapend.a_glossary:c:cryptographic_algorithm]] | ||
| + | that is uniquely associated with an entity and that may be made public. | ||
| + | In an asymmetric-key (**Public Key**) cryptosystem, the **Public Key** has a | ||
| + | corresponding [[dido:public:ra:xapend:xapend.a_glossary:p:private_key#definition_1 | Private Key]]. The **Public Key** may be known by anyone | ||
| + | and, depending on the algorithm, may be used, for example: | ||
| - | A **Public Key** is also used to encrypt a message or check the legitimacy of a [[dido:public:ra:xapend:xapend.a_glossary:d:digital_signature|digital signature]]. It is accompanied by a corresponding private key, which is known only to its owner. Private keys are used to decrypt messages that were created with the corresponding **Public Key** or to create signatures. In other words, a **Public Key** locks up data from unauthorized use, while a private key is used to unlock it. | + | - Verify a digital signature that was generated using the corresponding [[dido:public:ra:xapend:xapend.a_glossary:p:private_key#definition_1 | Private Key]], |
| + | - Encrypt keys that can be decrypted using the corresponding [[dido:public:ra:xapend:xapend.a_glossary:p:private_key#definition_1 | Private Key]], or | ||
| + | - Compute a shared secret during a key-agreement transaction. | ||
| - | **Public Keys** are available from a certificate authority, which issues digital certificates that prove the owner's identity and contain the owner's **Public Key**. **Public Keys** are created using an asymmetric algorithm, which pairs the **Public Key** with an associated private key. The most common algorithms used to generate **Public Key** are Rivest-Shamir-Adleman, elliptic curve cryptography, and Digital Signature Algorithm. | + | ==== Definition 2 ==== |
| - | A **Public Key** can be given to any person with whom an individual wants to communicate, whereas a private key belongs to the individual it was created for and isn't shared. The **Public Key** is typically stored on a [[dido:public:ra:xapend:xapend.a_glossary:p:pki]] server and is used to encrypt data securely before it is sent over the [[dido:public:ra:xapend:xapend.a_glossary:i:internet|internet]]. | + | In [[dido:public:ra:xapend:xapend.a_glossary:c:cryptography|cryptography]], a **Public Key** is a large numerical value that is used to encrypt data. The [[dido:public:ra:xapend:xapend.a_glossary:k:key|key]] can be generated by a software program, but more often, it is provided by a trusted, designated authority and made available to everyone through a publicly accessible repository or directory. |
| + | |||
| + | A **Public Key** is also used to encrypt a message or check the legitimacy of a [[dido:public:ra:xapend:xapend.a_glossary:d:digital_signature|digital signature]]. It is accompanied by a corresponding [[dido:public:ra:xapend:xapend.a_glossary:p:private_key|private key]], which is known only to its owner. Private keys are used to decrypt messages that were created with the corresponding **Public Key** or to create signatures. In other words, a **Public Key** locks up data from unauthorized use, while a private key is used to unlock it. | ||
| + | |||
| + | **Public Keys** are available from a [[dido:public:ra:xapend:xapend.a_glossary:c:ca]], which issues [[dido:public:ra:xapend:xapend.a_glossary:d:digital_certificate]] that prove the owner's identity and contain the owner's **Public Key**. **Public Keys** are created using an asymmetric algorithm, which pairs the **Public Key** with an associated private key. The most common algorithms used to generate **Public Key** are Rivest-Shamir-Adleman, elliptic curve cryptography, and Digital Signature Algorithm. | ||
| + | |||
| + | A **Public Key** can be given to any person with whom an individual wants to communicate, whereas a private key belongs to the individual it was created for and isn't shared. The **Public Key** is typically stored on a [[dido:public:ra:xapend:xapend.a_glossary:p:pki]] [[dido:public:ra:xapend:xapend.a_glossary:s:server|server]] and is used to encrypt data securely before it is sent over the [[dido:public:ra:xapend:xapend.a_glossary:i:internet|internet]]. | ||
| Source: [[https://searchsecurity.techtarget.com/definition/public-key ]] | Source: [[https://searchsecurity.techtarget.com/definition/public-key ]] | ||
dido/public/ra/xapend/xapend.a_glossary/p/public_key.1628524255.txt.gz · Last modified: 2021/08/09 11:50 by murphy
