Public Key Cryptography: RSA keys: PEM (Privacy-enhanced Electronic Mail) PEM key pairs can be used to store private keys and certificates. The most widely accepted storage format is called PEM. PEM is described in RFC 7468 ("Textual Encodings of PKIX, PKCS, and CMS Structures") In particular it is the standard algorithm used to generate SSH key pairs. I believe that a minimum level of knowledge regarding the various formats of RSA keys is mandatory for every developer nowadays.
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