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  • EU GDPR (2016)
  • ISO 27001:2022
  • NIS2
  • NIS2 Netherlands (Cbw, 2026)

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SV
Sam de Vries
sam.devries@tidewell-it.example
Legal

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Body

Purpose

This Policy sets how Tidewell IT uses cryptography to protect the confidentiality and integrity of information, so that encryption is strong, consistent, and manageable throughout its life.

Scope

This Policy covers every system, service, device, and process of Tidewell IT that encrypts, signs, or authenticates data, and the keys and certificates they depend on.

Policy statements

Approved algorithms

  1. Only algorithms and key lengths that are recognised as strong by current industry guidance are used. Algorithms that are deprecated are phased out on a plan that the Change Manager approves.
  2. Home-made cryptography is not allowed. Systems use well-reviewed, maintained libraries.
  3. Passwords are stored only as salted hashes made with a slow, purpose-built hashing function.
  4. The Change Manager reviews the list of approved algorithms every year, and again when a weakness is published.

Encryption in transit and at rest

  1. Data in transit is protected with TLS 1.2 as the minimum. TLS 1.3 is preferred and is enabled wherever the systems on both sides support it.
  2. Data at rest is encrypted with AES-256 on servers, storage, and backups.
  3. Full-disk encryption is enabled on every laptop before it is handed out, and the Service Desk checks it again at every inventory.
  4. Management interfaces are never reachable without encryption.
  5. Backups are encrypted before they leave the system they come from, and the copy in the other data centre is encrypted as well.

Key management

  1. Every key has an owner, a purpose, and a place in the key inventory.
  2. Keys are rotated yearly, and at once when a key may have been exposed or when a person with access leaves.
  3. Keys are stored apart from the data they protect, in a system built for key storage, and are never kept in repositories, tickets, or chat.
  4. Recovery of a backup key needs two people, each holding part of the access, and every recovery is logged.
  5. Changes to keys of critical systems are recorded with the names of the people who took part.

Certificates

  1. The Change Manager keeps an inventory of certificates with their owner, use, and expiry date.
  2. Expiry alerts go out 30 days ahead, and the owner renews the certificate before it lapses.
  3. Certificates are issued by trusted authorities, and private keys of certificates are generated on the system that uses them where possible.
  4. Self-signed certificates are used only inside test environments.

Roles and responsibilities

The Change Manager owns this Policy, the key inventory, and the certificate inventory. System owners apply the rules to their systems. The Service Desk Lead checks laptop encryption. The ISMS Manager reviews exceptions and reports on the state of cryptography to the Management Board.

Exceptions

An exception needs a written request to the ISMS Manager that states the reason, the risk, and an end date. Where a legacy system cannot meet the minimum protocol version, the Change Manager records a compensating control and a retirement date.

Compliance and enforcement

Breaches of this Policy lead to disciplinary measures under the HR process. Weak or expired cryptography found in a scan or an audit is raised as a Finding and tracked to closure.

Related documents

  • Information Security Policy
  • Information Classification and Retention Policy
  • Access Control Policy
  • Backup and Restore Procedure
  • Vulnerability and Patch Management Procedure

Review

The Change Manager reviews this Policy at least once a year and after a significant change. The Management Board approves each revised version.
    • — none —
    • PER-001 — Sam de Vries
    • PER-002 — Annelies Verbeek
    • PER-003 — Kasper Hoogland
    • PER-004 — Marloes Brinkman
    • PER-005 — Nadia El Idrissi
    • PER-006 — Lotte van Dijk
    • PER-007 — Thijs Bosman
    • PER-008 — Anika Raghavan
    • PER-009 — Daan Rijnders
    • PER-010 — Eva Lundmark
    • PER-011 — Selim Aydogdu
    • PER-012 — Ioana Vasilescu
    • PER-013 — Finn de Rooij
    • PER-014 — Gerrit Smeenk
    • PER-015 — Wouter Hazelhoff
    • PER-016 — Aisha Rahman
    • PER-017 — Niels Dekker
    • PER-018 — Tariq Rashidi
    • PER-019 — Fleur Maas
    • PER-020 — Hans Overbeek
    • PER-021 — Marit Koster
    • PER-022 — Alessandro Ferrante
    • PER-023 — Yara Visser
    • PER-024 — Lars Ekstedt
    • PER-025 — Amira Khalil
    • PER-026 — Remco Bergsma
    • PER-027 — Roos van Beek
    • PER-028 — Dimitri Volkov
    • PER-029 — Esther Blom
    • PER-030 — Mustafa Karaca
    • PER-031 — Floris Adriaanse
    • PER-032 — Joris Kamphuis
    • PER-033 — Lieke Bakhuizen
    • PER-034 — Charlotte Veldhuis
    • PER-035 — Rik Meinders
    • PER-036 — Elena Marques
    • PER-037 — Judith Haanstra
    • PER-038 — Vera Dijkstra
    • PER-039 — Hanneke Rutten
    • PER-040 — Bram Oosterhuis
    • PER-041 — Stefan Kowalski
    • PER-042 — Imogen Clarke
    • PER-043 — Gustav Lindahl
    • PER-044 — Noah Smit
    • PER-045 — Sofie Claes
    • PER-046 — Marjolein Teunissen
    • PER-047 — Willem-Jan Roest
    • PER-048 — Rosalind Achterberg
    • PER-049 — Mikael Strand
    • PER-050 — Ilse Wiegman
    • PER-051 — Cornelis Vos
    • PER-052 — Patrick Ellison

    Nothing found that matches the search criteria.
    • ROL-001 — ISMS Manager
    • ROL-002 — Internal Auditor
    • ROL-003 — Data Protection Officer
    • ROL-004 — Service Desk Lead
    • ROL-005 — Change Manager
    • ROL-006 — Incident Coordinator
    • ROL-007 — Supplier Manager
    • ROL-008 — HR Lead
    • ROL-009 — Facilities Lead
    • ROL-010 — Management Board

    Nothing found that matches the search criteria.
    Who must approve this policy?
    • ROL-001 — ISMS Manager
    • ROL-002 — Internal Auditor
    • ROL-003 — Data Protection Officer
    • ROL-004 — Service Desk Lead
    • ROL-005 — Change Manager
    • ROL-006 — Incident Coordinator
    • ROL-007 — Supplier Manager
    • ROL-008 — HR Lead
    • ROL-009 — Facilities Lead
    • ROL-010 — Management Board

    Nothing found that matches the search criteria.
    Who must read this document?
    Requirements covered by this policy
    • Art. 5(1)(a) — Lawfulness, fairness and transparency (Mandatory)
    • Art. 5(1)(b) — Purpose limitation (Mandatory)
    • Art. 5(1)(c) — Data minimisation (Mandatory)
    • Art. 5(1)(d) — Accuracy (Mandatory)
    • Art. 5(1)(e) — Storage limitation (Mandatory)
    • Art. 5(1)(f) — Integrity and confidentiality (Mandatory)
    • Art. 6 — Lawfulness of processing (Mandatory)
    • Art. 13-14 — Information to be provided to data subjects (Mandatory)
    • Art. 12 — Transparent communication and exercising rights (Mandatory)
    • Art. 15 — Right of access (Mandatory)
    • Art. 16 — Right to rectification (Mandatory)
    • Art. 17 — Right to erasure ('right to be forgotten') (Mandatory)
    • Art. 18 — Right to restriction of processing (Mandatory)
    • Art. 19 — Notify recipients of rectification, erasure, or restriction (Mandatory)
    • Art. 20 — Right to data portability (Mandatory)
    • Art. 21 — Right to object (Mandatory)
    • Art. 24 — Responsibility of the controller (accountability) (Mandatory)
    • Art. 25 — Data protection by design and by default (Mandatory)
    • Art. 28 — Processor contracts (Mandatory)
    • Art. 30 — Records of processing activities (Mandatory)
    • Art. 32 — Security of processing (Mandatory)
    • Art. 33 — Notification of a personal data breach to the supervisory authority (Mandatory)
    • Art. 34 — Communication of a personal data breach to the data subject (Mandatory)
    • Art. 35 — Data protection impact assessment (DPIA)
    • Art. 37-39 — Data protection officer (DPO)
    • Ch. V — International transfers of personal data
    • 4.1 — Understanding the organisation and its context (Mandatory)
    • 4.2 — Understanding the needs and expectations of interested parties (Mandatory)
    • 4.3 — Determining the scope of the information security management system (Mandatory)
    • 4.4 — Information security management system (Mandatory)
    • 5.1 — Leadership and commitment (Mandatory)
    • 5.2 — Policy (Mandatory)
    • 5.3 — Organisational roles, responsibilities and authorities (Mandatory)
    • 6.1.1 — Actions to address risks and opportunities - general (Mandatory)
    • 6.1.2 — Information security risk assessment (Mandatory)
    • 6.1.3 — Information security risk treatment (Mandatory)
    • 6.2 — Information security objectives and planning to achieve them (Mandatory)
    • 6.3 — Planning of changes (Mandatory)
    • 7.1 — Resources (Mandatory)
    • 7.2 — Competence (Mandatory)
    • 7.3 — Awareness (Mandatory)
    • 7.4 — Communication (Mandatory)
    • 7.5.1 — Documented information - general (Mandatory)
    • 7.5.2 — Creating and updating documented information (Mandatory)
    • 7.5.3 — Control of documented information (Mandatory)
    • 8.1 — Operational planning and control (Mandatory)
    • 8.2 — Information security risk assessment (operational) (Mandatory)
    • 8.3 — Information security risk treatment (operational) (Mandatory)
    • 9.1 — Monitoring, measurement, analysis and evaluation (Mandatory)
    • 9.2.1 — Internal audit - general (Mandatory)
    • 9.2.2 — Internal audit programme (Mandatory)
    • 9.3.1 — Management review - general (Mandatory)
    • 9.3.2 — Management review inputs (Mandatory)
    • 9.3.3 — Management review results (Mandatory)
    • 10.1 — Continual improvement (Mandatory)
    • 10.2 — Nonconformity and corrective action (Mandatory)
    • A.5.1 — Policies for information security
    • A.5.2 — Information security roles and responsibilities
    • A.5.3 — Segregation of duties
    • A.5.4 — Management responsibilities
    • A.5.5 — Contact with authorities
    • A.5.7 — Threat intelligence
    • A.5.8 — Information security in project management
    • A.5.9 — Inventory of information and other associated assets
    • A.5.10 — Acceptable use of information and other associated assets
    • A.5.11 — Return of assets
    • A.5.12 — Classification of information
    • A.5.13 — Labelling of information
    • A.5.14 — Information transfer
    • A.5.15 — Access control
    • A.5.16 — Identity management
    • A.5.17 — Authentication information
    • A.5.18 — Access rights
    • A.5.19 — Information security in supplier relationships
    • A.5.20 — Addressing information security within supplier agreements
    • A.5.21 — Managing information security in the ICT supply chain
    • A.5.22 — Monitoring, review and change management of supplier services
    • A.5.23 — Information security for use of cloud services
    • A.5.24 — Information security incident management planning and preparation
    • A.5.25 — Assessment and decision on information security events
    • A.5.26 — Response to information security incidents
    • A.5.27 — Learning from information security incidents
    • A.5.28 — Collection of evidence
    • A.5.29 — Information security during disruption
    • A.5.30 — ICT readiness for business continuity
    • A.5.31 — Legal, statutory, regulatory and contractual requirements
    • A.5.33 — Protection of records
    • A.5.34 — Privacy and protection of PII
    • A.5.35 — Independent review of information security
    • A.5.36 — Compliance with policies, rules and standards for information security
    • A.5.37 — Documented operating procedures
    • A.6.1 — Screening
    • A.6.2 — Terms and conditions of employment
    • A.6.3 — Information security awareness, education and training
    • A.6.4 — Disciplinary process
    • A.6.5 — Responsibilities after termination or change of employment
    • A.6.6 — Confidentiality or non-disclosure agreements
    • A.6.7 — Remote working
    • A.6.8 — Information security event reporting
    • A.7.1 — Physical security perimeters
    • A.7.2 — Physical entry
    • A.7.3 — Securing offices, rooms and facilities
    • A.7.4 — Physical security monitoring
    • A.7.5 — Protecting against physical and environmental threats
    • A.7.6 — Working in secure areas
    • A.7.7 — Clear desk and clear screen
    • A.7.8 — Equipment siting and protection
    • A.7.9 — Security of assets off-premises
    • A.7.10 — Storage media
    • A.7.11 — Supporting utilities
    • A.7.12 — Cabling security
    • A.7.14 — Secure disposal or re-use of equipment
    • A.8.1 — User end point devices
    • A.8.2 — Privileged access rights
    • A.8.3 — Information access restriction
    • A.8.4 — Access to source code
    • A.8.5 — Secure authentication
    • A.8.6 — Capacity management
    • A.8.7 — Protection against malware
    • A.8.8 — Management of technical vulnerabilities
    • A.8.9 — Configuration management
    • A.8.10 — Information deletion
    • A.8.12 — Data leakage prevention
    • A.8.13 — Information backup
    • A.8.14 — Redundancy of information processing facilities
    • A.8.15 — Logging
    • A.8.16 — Monitoring activities
    • A.8.17 — Clock synchronization
    • A.8.19 — Installation of software on operational systems
    • A.8.20 — Networks security
    • A.8.21 — Security of network services
    • A.8.22 — Segregation of networks
    • A.8.23 — Web filtering
    • A.8.24 — Use of cryptography
    • A.8.25 — Secure development life cycle
    • A.8.26 — Application security requirements
    • A.8.27 — Secure system architecture and engineering principles
    • A.8.28 — Secure coding
    • A.8.29 — Security testing in development and acceptance
    • A.8.31 — Separation of development, test and production environments
    • A.8.32 — Change management
    • A.8.33 — Test information
    • CIR 2024/2690 Annex 1 — Security policy and responsibilities
    • CIR 2024/2690 Annex 2 — Risk management, compliance monitoring and independent review
    • CIR 2024/2690 Annex 3 — Incident handling, monitoring and logging
    • CIR 2024/2690 Annex 4 — Continuity plan, backups and crisis management
    • CIR 2024/2690 Annex 5 — Supply chain policy and supplier register
    • CIR 2024/2690 Annex 6 — Secure acquisition, development and maintenance
    • CIR 2024/2690 Annex 7 — Measuring the effectiveness of security measures
    • CIR 2024/2690 Annex 8 — Awareness and security training
    • CIR 2024/2690 Annex 9 — Cryptography policy and key management
    • CIR 2024/2690 Annex 10 — Personnel security
    • CIR 2024/2690 Annex 11 — Access rights, privileged accounts and authentication
    • CIR 2024/2690 Annex 12 — Asset classification, handling and inventory
    • CIR 2024/2690 Annex 13 — Utilities, environmental threats and physical access
    • Cyberbeveiligingswet art. 21 — Duty of care (Mandatory)
    • Cyberbeveiligingsbesluit art. 6 — Security policy and responsibilities
    • Cyberbeveiligingsbesluit art. 7 — Risk management policy
    • Cyberbeveiligingsbesluit art. 8 — Incident handling and logging
    • Cyberbeveiligingsbesluit art. 9 — Business continuity and crisis management
    • Cyberbeveiligingsbesluit art. 10 — Supply chain security
    • Cyberbeveiligingsbesluit art. 11 — Secure acquisition, development and maintenance
    • Cyberbeveiligingsbesluit art. 12 — Cyber hygiene and training
    • Cyberbeveiligingsbesluit art. 13 — Cryptography policy
    • Cyberbeveiligingsbesluit art. 15 — Access policy
    • Cyberbeveiligingsbesluit art. 16 — Asset management
    • Cyberbeveiligingswet art. 24 — Board approval and training (Mandatory)
    • Cyberbeveiligingswet art. 25 — Duty to report significant incidents (Mandatory)
    • Cyberbeveiligingswet art. 26 — Early warning within 24 hours (Mandatory)
    • Cyberbeveiligingswet art. 27 — Notification within 72 hours (Mandatory)
    • Cyberbeveiligingswet art. 28 — Interim report (Mandatory)
    • Cyberbeveiligingswet art. 29 — Progress report and final report (Mandatory)
    • Cyberbeveiligingswet art. 30 — Informing the recipients of your services (Mandatory)
    • Cyberbeveiligingswet art. 44 — Registration in the national register (Mandatory)

    Nothing found that matches the search criteria.
    Linked requirements show this document as a coverage source on each requirement's Details page.
    Implemented by procedures
    • PRO-001 — Access Request and Review Procedure
    • PRO-007 — Backup and Restore Procedure
    • PRO-005 — Change Management Procedure
    • PRO-009 — Data Subject Request Handling Procedure
    • PRO-003 — Incident Handling Procedure
    • PRO-010 — Internal Audit and Management Review Procedure
    • PRO-002 — Joiner, Mover and Leaver Procedure
    • PRO-004 — Personal Data Breach Notification Procedure
    • PRO-012 — Physical Access and Visitor Management Procedure
    • PRO-011 — Security Awareness and Training Procedure
    • PRO-008 — Supplier Onboarding and Review Procedure
    • PRO-006 — Vulnerability and Patch Management Procedure

    Nothing found that matches the search criteria.
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