ITU-T

ITU (International Telecommunication Union)

ITU-T : CCITT(International Telegraph and Telephone Consultative Committee) TSAG (Telecommunication standardization Advisory Group).

ITU-T X Series(Data networks and open system communication)

  • Directory (X.500-X.586)
    • X.500 (02/01) Information technology – Open Systems Interconnection – The Directory: Overview of concepts, models and services
    • X.509 (03/00) Information technology – Open Systems Interconnection – The Directory: Public-key and attribute certificate frameworks
  • Abstract Syntax Notation One (ASN.1) (X.680-X.693)
    • X.680 (07/02) Information technology – Abstract Syntax Notation One(ASN.1): Specification of basic notation
    • X.681 (07/02) Information technology – Abstract Syntax Notation One (ASN.1): Information object specification
    • X.682 (07/02) Information technology – Abstract Syntax Notation One (ASN.1): Constraint specification
    • X.683 (07/02) Information technology – Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications
    • X.690 (07/02) Information technology – ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)
    • X.691 (07/02) Information technology – ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)
    • X.692 (03/02) Information technology – ASN.1 encoding rules: Specification of encoding control notation (ECN)
    • X.693 (12/01) Information technology – ASN.1 encoding rules: XML encoding rules (XER)