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Creating QR Code ISO/IEC18004 in Software Standards and Protocols

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Standards and Protocols
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Learn about the standards involved in establishing an interoperable Internet PKI Understand interoperability issues with PKI standards Discover how the common Internet protocols use and implement the PKI standards
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One of the biggest growth industries since the 1990s was the commercial use of the Internet None of the still steadily growing Internet commerce would be possible without the use of standards and protocols that provide a common, interoperable environment for exchanging information securely Due to the wide distribution of Internet users and businesses, the most practical solution to date has been the commercial implementation of public key infrastructures (PKIs) This chapter examines the standards and protocols involved in secure Internet transactions and e-business using a PKI Although you may use only a portion of the related standards and protocols on a daily basis, you should understand how they interact to provide the services that are critical for security: confidentiality, integrity, authentication, and nonrepudiation 5 introduced the algorithms and techniques used to implement a PKI, but as you probably noticed, there is a lot of room for interpretation Various organizations have developed and implemented standards and protocols that have been accepted as the basis for secure interaction in a PKI environment These standards fall into three general categories: Standards that define the PKI These standards define the data and data structures exchanged and the means for managing that data to provide the functions of the PKI (certificate issuance, storage, revocation, registration, and management) Standards that define the interface between applications and the underlying PKI These standards use the PKI to establish the services required by applications Other standards These standards don t fit neatly in either of the other two categories They provide bits and pieces that glue everything together; they can
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address not only the PKI structure and the methods and protocols for using it, but they can also provide an overarching business process environment for PKI implementation (for example, ISO/IEC 27002, Common Criteria, and the Federal Information Processing Standards Publications (FIPS PUBS)) Figure 6-1 shows the relationships between these standards and protocols Figure 6-1 conveys the interdependence of the standards and protocols discussed in this chapter The Internet PKI relies on three main standards for establishing interoperable PKI services: PKI X509 (PKIX), Public Key Cryptography Standards (PKCS), and X509 Other protocols and standards help define the management and operation of the PKI and related services Internet Security Association and Key Management Protocol (ISAKMP) and XML Key Management Specification (XKMS) are both key management protocols, while Certificate Management Protocol (CMP) is used for managing certificates Wired Equivalent Privacy (WEP) is used to encrypt wireless communications in 80211 environments to support some of the more application-oriented standards and protocols: Secure/Multipurpose Internet Mail Extensions (S/MIME) for e-mail; Secure Sockets Layer (SSL), Transport Layer Security (TLS), and Wireless Transport Layer Security (WTLS) for secure packet transmission; and IP Security (IPsec) and Point-to-Point Tunneling Protocol (PPTP) to support virtual private networks ISO/IEC 27002 and FIPS PUBS each address security at the business process, application, protocol, and PKI implementation levels Finally, Pretty Good Privacy (PGP) provides an alternative method spanning the protocol and application levels This chapter examines each standard from the bottom up, starting with building an infrastructure through protocols and applications, and finishing with some of the inherent weaknesses of and potential attacks on a PKI
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Figure 6-1 Relationships between PKI standards and protocols
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6: Standards and Protocols
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PKIX/PKCS
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Two main standards have evolved over time to implement PKI on a practical level on the Internet Both are based on the X509 certificate standard (discussed shortly in the X509 section) and establish complementary standards for implementing PKI PKIX and PKCS intertwine to define the most commonly used set of standards PKIX was produced by the Internet Engineering Task Force (IETF) and defines standards for interactions and operations for four component types: the user (end-entity), certificate authority (CA), registration authority (RA), and the repository for certificates and certificate revocation lists (CRLs) PKCS defines many of the lower level standards for message syntax, cryptographic algorithms, and the like The PKCS set of standards is a product of RSA Security The PKIX working group was formed in 1995 to develop the standards necessary to support PKIs At the time, the X509 Public Key Certificate (PKC) format was proposed as the basis for a PKI X509 includes information regarding data formats and procedures used for CA-signed PKCs, but it doesn t specify values or formats for many of the fields within the PKC X509 v1 (version 1) was originally defined in 1988 as part of the X500 Directory standard After being co-opted by the Internet community for implementing certificates for secure Internet communications, X509 s shortcomings became apparent The current version, X509 v3, was adopted in 1996 X509 is very complex, allowing a great deal of flexibility in implementing certificate features PKIX provides standards for extending and using X509 v3 certificates and for managing them, enabling interoperability between PKIs following the standards PKIX uses the model shown in Figure 6-2 for representing the components and users of a PKI The user, called an end-entity, is not part of the PKI, but end-entities are either users of the PKI certificates, the subject of a certificate (an entity identified by it), or both The CA is responsible for issuing, storing, and revoking certificates both PKCs and Attribute Certificates (ACs) The RA is responsible for management activities
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