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ISO/IEC 18014Information technology — Security techniques —Time-stamping services is aninternational standard that specifies time-stamping techniques. It comprises four parts:

• Part 1: Framework^[1]
• Part 2: Mechanisms producing independent tokens^[2]
• Part 3: Mechanisms producing linked tokens^[3]
• Part 4: Traceability of time sources^[4]

In this first part of ISO/IEC 18014, several things are explained and developed:

• The identification of the objectives of a time authority.
• The description of a general model on which time stamping services are based.
• The definition oftime stamping services.
• The definition of the basic protocols oftime stamping.
• The specifications of the protocols between the involved entities.

Key words:audit,non-repudiation,security,time-stamp

Atime-stamping service provides evidence that a data item existed before a certain point in time.Time-stamp services produce time-stamptokens, which are data structures containing a verifiablecryptographic binding between adata item's representation and a time-value. This part of ISO/IEC 18014 definestime-stamping mechanisms that produce independenttokens, which can be verified one by one.

This part of ISO/IEC 18014:

• Describes a general model fortime-stamping services producing linkedtokens.
• Describes the basic components used to construct a time-stamping service of this type.
• Defines thedata structures used to interact with atime-stamping service of this type.
• Describes specific instances of suchtime-stamping services.

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