Overview#

A Public Key and Private Key are Cryptographic Keys that are Cryptographically (mathematically) linked.Public Key and Private Key together form a Public-Private Key pairPublic Key need not be protected and SHOULD be expected to be available to Everybody.
LDAPWiki specifically addresses RSA Cryptography on this page even though there are other Algorithms which are similar in usage. Public Key is used to:

Asymmetric Key Cryptography as contrasted Symmetric Key Cryptography which relies on the same key to perform both.

More Information#

There might be more information for this subject on one of the following: