SIST-TS CEN ISO/TS 24534-4:2008

Automatic vehicle and equipment identification - Electronic Registration Identification (ERI) for vehicles - Part 4: Secure communications using asymmetrical techniques (ISO/TS 24534-4:2008)

This part of ISO/TS 24534 provides the requirements for an Electronic Registration Identification (ERI) that is based on an identifier assigned to a vehicle (e.g. for recognition by national authorities) suitable to be used for: - electronic identification of local and foreign vehicles by national authorities, - vehicle manufacturing, in-life-maintenance and end-of-life identification (vehicle life cycle management), - adaptation of vehicle data, e.g. in case of international re-sales, - safety-related purposes, - crime reduction, and - commercial services. It adheres to privacy and data protection regulations. This part of ISO/TS 24534 specifies the interfaces for a secure exchange of data between an ERT and an ERI reader or ERI writer in or outside the vehicle using asymmetric encryption techniques. This Technical Specification includes: - the application layer interface between an ERT and an onboard ERI reader or writer, - the application layer interface between the onboard ERI equipment and external ERI readers and writers, and - security issues related to the communication with the ERT.

Straßenverkehrstelematik (RTTT) - Automatische Identifizierung von Fahrzeugen und Ausrüstungen - Elektronische Identifizierung für die Registrierung (ERI) - Teil 4: Sichere Anwendungsebene mittels asymmetrischer Techniken (ISO/TS 24534-4:2008)

Identification automatique des véhicules et des équipements - Identification d'enregistrement électronique (ERI) pour les véhicules - Partie 4: Communications sûres utilisant des techniques asymétriques (ISO/TS 24534-4:2008)

Avtomatična identifikacija vozil in opreme - Elektronska identifikacija registracije (ERI) za vozila - 4. del: Varne komunikacije, pri katerih se uporabljajo asimetrične tehnike (ISO/TS 24534-4:2008)

General Information

• Status: Withdrawn
• Publication Date: 06-May-2008
• Withdrawal Date: 02-Sep-2010
• ICS: 03.220.20 - Road transport
• ICS: 35.240.60 - IT applications in transport
• Technical Committee: ITC - Information technology
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 02-Sep-2010
• Due Date: 25-Sep-2010
• Completion Date: 03-Sep-2010
• Ref Project: CEN ISO/TS 24534-4:2008 - Automatic vehicle and equipment identification - Electronic Registration Identification (ERI) for vehicles - Part 4: Secure communications using asymmetrical techniques (ISO/TS 24534-4:2008)

Relations

• Replaced By: SIST EN ISO 24534-4:2010 - Automatic vehicle and equipment identification - Electronic Registration Identification (ERI) for vehicles - Part 4: Secure communications using asymmetrical techniques (ISO 24534-4:2010)
• Effective Date: 01-Oct-2010
• Replaced By: SIST EN ISO 24534-4:2010 - Automatic vehicle and equipment identification - Electronic Registration Identification (ERI) for vehicles - Part 4: Secure communications using asymmetrical techniques (ISO 24534-4:2010)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TS CEN ISO/TS 24534-4:2008
01-junij-2008
$YWRPDWLþQDLGHQWLILNDFLMDYR]LOLQRSUHPH(OHNWURQVNDLGHQWLILNDFLMDUHJLVWUDFLMH
(5,]DYR]LODGHO9DUQHNRPXQLNDFLMHSULNDWHULKVHXSRUDEOMDMRDVLPHWULþQH
WHKQLNH,6276
Automatic vehicle and equipment identification - Electronic Registration Identification
(ERI) for vehicles - Part 4: Secure communications using asymmetrical techniques
(ISO/TS 24534-4:2008)
Straßenverkehrstelematik (RTTT) - Automatische Identifizierung von Fahrzeugen und
Ausrüstungen - Elektronische Identifizierung für die Registrierung (ERI) - Teil 4: Sichere
Anwendungsebene mittels asymmetrischer Techniken (ISO/TS 24534-4:2008)
Identification automatique des véhicules et des équipements - Identification
d'enregistrement électronique (ERI) pour les véhicules - Partie 4: Communications sûres
utilisant des techniques asymétriques (ISO/TS 24534-4:2008)
Ta slovenski standard je istoveten z: CEN ISO/TS 24534-4:2008
ICS:
03.220.20 Cestni transport Road transport
35.240.60 Uporabniške rešitve IT v IT applications in transport
transportu in trgovini and trade
SIST-TS CEN ISO/TS 24534-4:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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TECHNICAL SPECIFICATION
CEN ISO/TS 24534-4
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
February 2008
ICS 35.240.60; 03.220.20

English Version
Automatic vehicle and equipment identification - Electronic
Registration Identification (ERI) for vehicles - Part 4: Secure
communications using asymmetrical techniques (ISO/TS 24534-
4:2008)
Identification automatique des véhicules et des Straßenverkehrstelematik (RTTT) - Automatische
équipements - Identification d'enregistrement électronique Identifizierung von Fahrzeugen und Ausrüstungen -
(ERI) pour les véhicules - Partie 4: Communications sûres Elektronische Identifizierung für die Registrierung (ERI) -
utilisant des techniques asymétriques (ISO/TS 24534- Teil 4: Sichere Anwendungsebene mittels asymmetrischer
4:2008) Techniken (ISO/TS 24534-4:2008)
This Technical Specification (CEN/TS) was approved by CEN on 17 July 2006 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TS 24534-4:2008: E
worldwide for CEN national Members.

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CEN ISO/TS 24534-4:2008 (E)
Contents Page
Foreword.3

2

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CEN ISO/TS 24534-4:2008 (E)
Foreword
This document (CEN ISO/TS 24534-4:2008) has been prepared by Technical Committee CEN/TC 278 "Road
transport and traffic telematics", the secretariat of which is held by NEN, in collaboration with Technical
Committee ISO/TC 204 "Transport information and control systems".
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this CEN Technical Specification: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
3

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TECHNICAL ISO/TS
SPECIFICATION 24534-4
First edition
2008-02-15

Automatic vehicle and equipment
identification — Electronic Registration
Identification (ERI) for vehicles —
Part 4:
Secure communications using
asymmetrical techniques
Identification automatique des véhicules et des équipements —
Identification d'enregistrement électronique (ERI) pour les véhicules —
Partie 4: Communications sûres utilisant des techniques asymétriques






Reference number
ISO/TS 24534-4:2008(E)
©
ISO 2008

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ISO/TS 24534-4:2008(E)
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ii © ISO 2008 – All rights reserved

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ISO/TS 24534-4:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions. 2
4 Abbreviations . 11
5 System communications concept. 12
5.1 Introduction . 12
5.2 Overview . 12
5.3 Security services . 19
5.4 Communication architecture description. 24
5.5 Interfaces . 26
6 Interface requirements . 27
6.1 Overview . 27
6.2 Abstract transaction definitions. 28
6.3 The ERT interfaces . 65
Annex A (normative) ASN.1 Modules. 69
Annex B (informative) Operational scenarios . 80
Annex C (normative) PICS pro forma. 91
Bibliography . 95

© ISO 2008 – All rights reserved iii

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ISO/TS 24534-4:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of normative document:
— an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
— an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TS 24534-4 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems, and by
Technical Committee CEN/TC 278, Road transport and traffic telematics in collaboration.
ISO/TS 24534 consists of the following parts, under the general title Automatic vehicle and equipment
identification — Electronic Registration Identification (ERI) for vehicles:
⎯ Part 1: Architecture
⎯ Part 2: Operational requirements
⎯ Part 3: Vehicle data
⎯ Part 4: Secure communications using asymmetrical techniques
⎯ Part 5: Secure communications using symmetrical techniques
iv © ISO 2008 – All rights reserved

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ISO/TS 24534-4:2008(E)
Introduction
A quickly emerging need has been identified within administrations to improve the unique identification of
vehicles for a variety of services. Situations are already occurring where manufacturers intend to fit lifetime
tags to vehicles. Various governments are considering the needs/benefits of ERI such as legal proof of vehicle
identity with potential mandatory usages. There is a commercial and economic justification both in respect of
tags and infrastructure that a standard enables an interoperable solution.
Electronic Registration Identification (ERI) is a means of uniquely identifying road vehicles. The application of
ERI will offer significant benefits over existing techniques for vehicle identification. It will be an enabling
technology for the future management and administration of traffic and transport, including applications in
free-flow, multi-lane, traffic conditions with the capability to support mobile transactions. ERI addresses the
need of authorities and other users for a trusted electronic identification, including roaming vehicles.
This part of ISO/TS 24534 specifies the application layer interfaces for the exchange of data between an
onboard component containing the ERI data and a reader or writer inside or outside the vehicle.
The exchanged identification data consists of a unique vehicle identifier and may also include data typically
found in the vehicle's registration certificate. The authenticity of the exchanged vehicle data can be further
enhanced by ensuring data has been obtained by request from a commissioned device, with the data
electronically signed by the registration authority.
In order to facilitate (international) re-sales of vehicles, the ERI interface includes provisions for another
accredited registration authority to take over the registration of a vehicle.
The ERI interface supports confidentiality measures to adhere to (inter)national privacy regulation and to
prevent other misuse of electronic identification of vehicles. A registration authority may authorize other
authorities to access the vehicle's data. A holder of a registration certificate may authorize an additional
service provider to identify the vehicle when he/she wants commercial service.
However, it is perceived that different users may have different requirements for authentication and
confidentiality. This Technical Specification therefore supports different levels of security with maximum
compatibility. Much attention is given to the interoperability of the component containing the ERI data and
readers of various levels of capability, e.g. the identification of a vehicle with a less capable ERI data
component by a more sophisticated reader equipment and vice versa.
The supported complexity of the device containing the ERI data may range from a very simple read-only
device that only contains the vehicle's identifier, to a sophisticated device that includes both authentication
and confidentiality measures and maintains a historic list of the vehicle data written by the manufacturer and
by vehicle registration authorities.
Following the events of 11 September 2001, and subsequent reviews of anti-terrorism measures, the need for
ERI has been identified as a possible anti-terrorism measure. The need for International or pan-European
harmonization of such ERI is therefore important. It is also important to ensure that any ERI measures contain
protection against misuse by terrorists.
This part of ISO/TS 24534 makes use of the basic automatic vehicle identification (AVI) provisions already
defined in ISO 14814 and 14816.

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TECHNICAL SPECIFICATION ISO/TS 24534-4:2008(E)

Automatic vehicle and equipment identification — Electronic
Registration Identification (ERI) for vehicles —
Part 4:
Secure communications using asymmetrical techniques
1 Scope
This part of ISO/TS 24534 provides the requirements for an Electronic Registration Identification (ERI) that is
based on an identifier assigned to a vehicle (e.g. for recognition by national authorities) suitable to be used
for:
⎯ electronic identification of local and foreign vehicles by national authorities,
⎯ vehicle manufacturing, in-life-maintenance and end-of-life identification (vehicle life cycle management),
⎯ adaptation of vehicle data, e.g. in case of international re-sales,
⎯ safety-related purposes,
⎯ crime reduction, and
⎯ commercial services.
It adheres to privacy and data protection regulations.
This part of ISO/TS 24534 specifies the interfaces for a secure exchange of data between an ERT and an ERI
reader or ERI writer in or outside the vehicle using asymmetric encryption techniques.
NOTE 1 The onboard device containing the ERI data is called the Electronic Registration Tag (ERT).
This Technical Specification includes:
⎯ the application layer interface between an ERT and an onboard ERI reader or writer,
⎯ the application layer interface between the onboard ERI equipment and external ERI readers and writers,
and
⎯ security issues related to the communication with the ERT.
NOTE 2 The vehicle identifiers and possible additional vehicle data (as typically contained in vehicle registration
certificates) are defined in ISO/TS 24534-3.
NOTE 3 The secure application layer interfaces for the exchange of ERI data with an ERI reader or writer are specified
in ISO/TS 24534-4 and a future ISO/TS 24534-5.
© ISO 2008 – All rights reserved 1

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ISO/TS 24534-4:2008(E)
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO/IEC 7498-1:1994, Information technology — Open Systems Interconnection — Basic Reference Model:
The Basic Model
ISO/IEC 7498-2:1989, Information processing systems — Open Systems Interconnection — Basic Reference
Model — Part 2: Security Architecture
ISO/IEC 8824 (all parts), Information technology — Abstract Syntax Notation One (ASN.1)
ISO/IEC 8825-2, Information technology — ASN.1 encoding rules: Specification of Packed Encoding Rules
(PER) — Part 2
ISO/IEC 9798-1:1997, Information technology — Security techniques — Entity authentication — Part 1:
General
ISO/IEC 10118-1:2000, Information technology — Security techniques — Hash-functions — Part 1: General
ISO/IEC 10181-2:1996, Information technology — Open Systems Interconnection — Security framework for
open systems: Authentication framework
ISO/IEC 10646:2003, Information technology — Universal Multiple-Octet Coded Character Set (UCS)
ISO/IEC 14443 (all parts), Identification cards — Contactless integrated circuit(s) cards — Proximity cards
ISO/CD 14814, Road transport and traffic telematics — Automatic vehicle and equipment identification —
Reference architecture and terminology
ISO 14816, Road transport and traffic telematics — Automatic vehicle and equipment identification —
Numbering and data structure
ISO 15628, Transport Information and Control Systems (TICS) — Dedicated Short Range Communication
(DSRC) — DSRC application layer
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
access control
prevention of unauthorized use of a resource, including the prevention of use of a resource in an unauthorized
manner
[ISO 7498-2, definition 3.3.1]
3.2
access control list
list of entities, together with their access rights, which are authorized to have access to a resource
[ISO 7498-2, definition 3.3.2]
3.3
active threat
threat of a deliberate unauthorized change to the state of the system
[ISO 7498-2, definition 3.3.4]
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ISO/TS 24534-4:2008(E)
EXAMPLE Examples of security-relevant active threats may include modification of messages, replay of messages,
and insertion of spurious messages, masquerading as an authorized entity and denial of service.
3.4
additional vehicle data
ERI data in addition to the vehicle identifier
[ISO 24534-3, definition 3.1]
3.5
air Interface
conductor-free medium between onboard equipment (OBE) and the reader/interrogator through which the
linking of the OBE to the reader /interrogator is achieved by means of electro-magnetic signals
[ISO 14814, definition 3.2]
3.6
authority
organisation that is allowed by public law to identify a vehicle using ERI
3.7
authorization
granting of rights, which includes the granting of access based on access rights
[ISO 7498-2, definition 3.3.10]
3.8
certification authority
natural or legal person trusted to create public key certificates
NOTE See also top-level certification authority and intermediate certification authority.
3.9
challenge
data item chosen at random and sent by the verifier to the claimant, which is used by the claimant, in
conjunction with secret information held by the claimant, to generate a response which is sent to the verifier
[ISO 9798-1, definition 3.3.5]
NOTE In this Technical specification the term challenge is also used in case an ERT does not have enabled
encryption capabilities and the challenge is merely copied without any secret information applied.
3.10
ciphertext
data produced, through the use of encipherment; the semantic content of the resulting data is not available
[ISO 7498-2, definition 3.3.14]
3.11
claimant
entity which is or represents a principal for the purposes of authentication
NOTE A claimant includes the functions necessary for engaging in authentication exchanges on behalf of a principal.
[ISO 10181-2, definition 3.10]
3.12
cleartext
intelligible data, the semantic content of which is available
[ISO 7498-2, definition 3.3.15]
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ISO/TS 24534-4:2008(E)
3.13
confidentiality
property that information is not made available or disclosed to unauthorized individuals, entities, or processes
[ISO 7498-2, definition 3.3.16]
3.14
credentials
data that is transferred to establish the claimed identity of an entity
[ISO 7498-2, definition 3.3.17]
3.15
cryptography
discipline which embodies principles, means, and methods for the transformation of data in order to hide its
information content, prevent its undetected modification and/or prevent its unauthorized use
[ISO 7498-2, definition 3.3.20]
3.16
data integrity
integrity
property that data has not been altered or destroyed in an unauthorized manner
[ISO 7498-2, definition 3.3.21]
3.17
decipherment
decryption
reversal of a corresponding reversible encipherment
[ISO 7498-2, definition 3.3.23]
3.18
digital signature
signature
data appended to, or a cryptographic transformation of, a data unit that allows a recipient of the data unit to
prove the source and integrity of the data unit and protect against forgery, e.g. by the recipient
NOTE See also cryptography.
[ISO 7498-2, definition 3.3.26]
3.19
distinguishing identifier
information which unambiguously distinguishes an entity
[ISO/IEC 9798-1, definition 3.3.9]
3.20
electronic registration identification
ERI
action or act of identifying a vehicle with electronic means for purposes as mentioned in the scope of this part
of ISO/TS 24534
3.21
electronic registration reader
ERR
device used to read or read/write data from or to an ERT
NOTE 1 An ERR communicates directly, i.e. via an OSI data-link, with an ERT.
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ISO/TS 24534-4:2008(E)
NOTE 2 An ERR may also be an ERI reader and/or an ERI writer or may act a relay in the exchange of ERI data
protocol units between an ERT and an ERI reader/writer.
3.22
electronic registration tag
ERT
onboard ERI device that contains the ERI data including the relevant implemented security provisions and one
or more interfaces to access that data
NOTE 1 In case of high security, the ERT is a type of secure application module (SAM).
NOTE 2 An implementer may choose also to integrate other provisions (e.g. for DSRC communications) into an ERT
as long as this does not compromise the security of the ERT.
3.23
encipherment
encryption
cryptographic transformation of data to produce ciphertext
[ISO 7498-2, definition 3.3.27]
NOTE 1 Encipherment may be irreversible, in which case the corresponding decipherment process cannot feasibly be
performed.
NOTE 2 See also cryptography.
[ISO 7498-2]
3.24
end-to-end encipherment
encipherment of data within or at the source end system, with the corresponding decipherment occurring only
within or at the destination end system
[ISO 7498-2, definition 3.3.29]
3.25
entity authentication
corroboration that an entity is the one claimed
[ISO/IEC 9798-1, definition 3.3.11]
3.26
ERI data
vehicle identifying data which can be obtained from an ERT
NOTE ERI data consist of the vehicle identifier and possible additional vehicle data.
3.27
ERI reader
device used to read ERI data directly or indirectly from an ERT by invoking ERI transactions
NOTE 1 In case an ERI reader exchanges the ERI protocol data units directly via a data link with an ERT it is also
called an ERR. In case it communicates via one or more nodes, only the last node in this sequence is called an ERR. As a
consequence, an external ERI reader may e.g. depending on the onboard configuration, act for some vehicles as an ERR
and for others not.
NOTE 2 See also onboard ERI reader and external ERI reader.
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ISO/TS 24534-4:2008(E)
3.28
ERI transaction
transaction as defined in Clause 6 of this part of ISO/TS 24534
3.29
ERI writer
device used to write ERI data directly or indirectly into an ERT by invoking ERI transactions
NOTE 1 In case an ERI writer exchanges the ERI protocol data units directly via a data link with an ERT it is also called
an ERR. In case it communicates via one or more nodes, only the last node in this sequence is called an ERR. As a
consequence, an external ERI writer may, e.g. depending on the onboard configuration, act for some vehicles as an ERR
and for others not.
NOTE 2 See also onboard ERI writer and external ERI writer.
3.30
ERT holder
legal or natural person holding an ERT
NOTE The ERT holder could be, for example, the holder of the registration number or the owner, operator or keeper
of the vehicle.
3.31
ERT number
number assigned to and written into an ERT that acts as an ERT unique identifier
NOTE The ERT number is assumed to be written into the ERT during its manufacture and once written cannot be
changed.
3.32
external ERI reader
an ERI reader not being part of the onboard ERI equipment
NOTE 1 An external ERI reader is not fitted within or on the outside of the vehicle.
NOTE 2 A distinction is made between proximity, short-range (DSRC), and remote external readers. A proximity reader
may e.g. be a PCD (Proximity Coupling Device) as specified in ISO 14443. A short-range external ERI reader may be a
part of roadside equipment, hand-held equipment, or mobile equipment. A remote external ERI reader may be part of the
back-office equipment (BOE).
3.33
external ERI writer
ERI writer not being part of the onboard ERI equipment
NOTE 1 An external ERI writer is not fitted within or on the outside of the vehicle.
NOTE 2 A distinction is made between proximity, short-range (DSRC), and remote external writers. A proximity reader
may e.g. be a PCD (Proximity Coupling Device) as specified in ISO 14443. A short-range external ERI writer may be (a
part of) roadside equipment, hand-held equipment, or mobile equipment. A remote external ERI writer may be part of the
back-office equipment (BOE).
3.34
hash-code
string of bits which is the output of a hash-function
3.35
hash-function
function which maps strings of bits to fixed-length strings of bits, satisfying the following two properties:
a) for a given output, it is computationally infeasible to find an input which maps to this output; and
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ISO/TS 24534-4:2008(E)
b) for a given output, it is computationally infeasible to find a second input which maps to the same output
[ISO/IEC 10118-1, definition 3.5]
NOTE Computational feasibility
...