PKI Standards and Protocols

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PKI Standards and Protocols:


Without standards and protocols, PKI would become unsustainable. The Public-Key Cryptography Standards (PKCS) are established protocols used for securing the exchange of information through PKI.

The PKCS standards were developed by RSA laboratories:

PKCS #1: RSA Cryptography Standard outlines the encryption of data using the RSA algorithm. The purpose of the RSA Cryptography Standard is in the development of digital signatures and digital envelopes. PKCS #1 also describes syntax for RSA public keys and private keys. The public-key syntax is used for certificates, while the private-key syntax is used for encrypting private keys.

*(#2 and #4 merged with #1)

PKCS #3: Diffie-Hellman Key Agreement Standard outlines the use of the Diffie-Hellman Key Agreement, a method of sharing a secret key between two parties. The secret key is used to encrypt ongoing data transfer between the two parties. Whitfield Diffie and Martin Hellman developed the Diffie-Hellman algorithm in the 1970s as the first asymmetric cryptographic system. Diffie-Hellman overcomes the issues of symmetric key systems because management of the keys is less difficult.

PKCS #5: Password-Based Cryptography Standard defines a method for encrypting a string with a secret key that is derived from a password. The result of the method is an octet string (8-character string).

PKCS #6: Extended-Certificate Syntax Standard deals with extended certificates. Extendedcertificates are made up of the X.509 certificate plus additional attributes. The additional attributes and the X.509 certificate can be verified using a single public-key operation. The issuer that signs the extended certificate is the same as the one that signs the X.509 certificate.

PKCS #7: 

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