PKCS 1 is one of the Public-Key Cryptography Standards which was titled RSA Cryptography Standard and is defined in RFC 3447.

PKCS 1 defines the mathematical properties and format of RSA Public Keys and Private Keys (ASN.1-encoded in clear-text), and the basic algorithms and encoding/padding schemes for performing RSA encryption, decryption, and producing and verifying signatures.

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There might be more information for this subject on one of the following:
  • [#1] - PKCS_1 - based on information obtained 2017-05-19-