ISO/IEC 18014 ''Information technology — Security techniques — Time-stamping services'' is an

international standard international standard is a technical standard developed by one or more international standards organizations. International standards are available for consideration and use worldwide. The most prominent such organization is the International Or ...

that specifies time-stamping techniques. It comprises four parts: * ''Part 1: Framework'' * ''Part 2: Mechanisms producing independent tokens'' * ''Part 3: Mechanisms producing linked tokens'' * ''Part 4: Traceability of time sources''ISO/IEC 18014-4:2015
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Part 1: Framework

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 of time stamping services. * The definition of the basic protocols of time stamping. * The specifications of the protocols between the involved entities. Key words:

audit An audit is an "independent examination of financial information of any entity, whether profit oriented or not, irrespective of its size or legal form when such an examination is conducted with a view to express an opinion thereon.” Auditing ...

non-repudiation Non-repudiation refers to a situation where a statement's author cannot successfully dispute its authorship or the validity of an associated contract. The term is often seen in a legal setting when the authenticity of a signature is being challenged ...

security Security is protection from, or resilience against, potential harm (or other unwanted coercive change) caused by others, by restraining the freedom of others to act. Beneficiaries (technically referents) of security may be of persons and social ...

, time-stamp

Part 2: Mechanisms producing independent tokens

A time-stamping service provides evidence that a data item existed before a certain point in time. Time-stamp services produce time-stamp

token Token may refer to: Arts, entertainment, and media * Token, a game piece or counter, used in some games * The Tokens, a vocal music group * Tolkien Black, a recurring character on the animated television series ''South Park,'' formerly known as ...

s, which are data structures containing a verifiable

cryptographic Cryptography, or cryptology (from grc, , translit=kryptós "hidden, secret"; and ''graphein'', "to write", or '' -logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of adve ...

binding between a data item's representation and a time-value. This part of ISO/IEC 18014 defines time-stamping mechanisms that produce independent

s, which can be verified one by one.

Part 3: Mechanisms producing linked tokens

This part of ISO/IEC 18014: * Describes a general model for time-stamping services producing linked

s. * Describes the basic components used to construct a time-stamping service of this type. * Defines the

data structure In computer science, a data structure is a data organization, management, and storage format that is usually chosen for efficient access to data. More precisely, a data structure is a collection of data values, the relationships among them, a ...

s used to interact with a time-stamping service of this type. * Describes specific instances of such time-stamping services.

References

Cryptography standards #18014 {{crypto-stub