====== Cryptographic Key ======
[[dido:public:ra:xapend:xapend.a_glossary:start| Return to Glossary ]]

**Cryptographic 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 parameter used in conjunction with a [[dido:public:ra:xapend:xapend.a_glossary:c:cryptographic_algorithm]] that
determines its operation in such a way that an entity with knowledge of
the key can reproduce, reverse or verify the operation while an entity
without knowledge of the **Cryptographic Key**, cannot. 

Examples include:

  - The transformation of [[dido:public:ra:xapend:xapend.a_glossary:p:plaintext]] data into [[dido:public:ra:xapend:xapend.a_glossary:c:ciphertext]] data,
  - The transformation of [[dido:public:ra:xapend:xapend.a_glossary:c:ciphertext]] data into [[dido:public:ra:xapend:xapend.a_glossary:p:plaintext]] data,
  - The computation of a [[dido:public:ra:xapend:xapend.a_glossary:d:digital_signature]] from data,
  - The verification of a [[dido:public:ra:xapend:xapend.a_glossary:d:digital_signature]] on data,
  - The computation of an [[dido:public:ra:xapend:xapend.a_glossary:a:authentication_code]] from data,
  - The verification of an [[dido:public:ra:xapend:xapend.a_glossary:a:authentication_code]] from data and a received or retrieved authentication code, and
  - The computation of a shared secret that is used to derive keying material.

Source: [[https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57pt1r5.pdf ]]


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