Chapter 5: File Sharing and Collaboration

CryptPad Security Architecture:
1. Client-Side Encryption:
   - All encryption/decryption occurs in browser
   - Server never sees unencrypted content
   - Zero-knowledge architecture
   - User controls all cryptographic keys

2. Document Access Control:
   - Cryptographic access control
   - Share links contain encryption keys
   - No server-side access management
   - Perfect forward secrecy for documents

3. Anonymous Usage:
   - No account required for basic usage
   - Optional accounts for additional features
   - No personal information collection
   - IP address protection through Tor

CryptPad Server Specifications:
- CPU: 2+ cores, 2.4 GHz minimum
- RAM: 4 GB minimum, 8 GB recommended
- Storage: 50 GB SSD minimum
- Network: Reliable internet with static IP
- OS: Ubuntu 20.04 LTS or Debian 11

Secure Document Workflow:
1. Document Creation:
   - Access CryptPad through Tor Browser
   - Create document without account registration
   - Use strong password for document protection
   - Configure appropriate access permissions

2. Collaboration Setup:
   - Generate secure sharing link
   - Share link through secure communication channel
   - Verify collaborator identity before sharing
   - Establish collaboration protocols and guidelines

3. Access Management:
   - Use view-only links for read-only access
   - Implement edit permissions carefully
   - Regular review of document access
   - Revoke access when no longer needed

CryptPad Security Practices:
1. Password Protection:
   - Use strong, unique passwords for sensitive documents
   - Share passwords through separate secure channels
   - Regular password rotation for long-term documents
   - Document password management procedures

2. Access Control:
   - Limit sharing to necessary participants only
   - Use appropriate permission levels (view/edit/own)
   - Regular review and cleanup of shared documents
   - Monitor document access and activity

3. Content Security:
   - Avoid including identifying information
   - Use coded language for sensitive topics
   - Regular content review and sanitization
   - Secure deletion of obsolete documents

Secure Collaboration Procedures:
1. Document Standards:
   - Consistent naming conventions
   - Clear version identification
   - Standardized formatting and structure
   - Security classification markings

2. Editing Protocols:
   - Coordinated editing schedules
   - Change tracking and documentation
   - Conflict resolution procedures
   - Review and approval processes

3. Communication Integration:
   - Coordinate document work through secure messaging
   - Use separate channels for document discussion
   - Verify changes through multiple channels
   - Document decision-making processes

CryptPad Document Types:
1. Rich Text Documents:
   - Collaborative word processing
   - Real-time editing and comments
   - Export to various formats
   - Version history and restoration

2. Spreadsheets:
   - Collaborative data analysis
   - Formula and calculation support
   - Chart and graph creation
   - Data import and export

3. Presentations:
   - Collaborative slide creation
   - Real-time presentation mode
   - Media embedding and formatting
   - Export and sharing options

4. Code Editor:
   - Collaborative code development
   - Syntax highlighting and formatting
   - Multiple programming language support
   - Version control integration

5. Kanban Boards:
   - Project management and task tracking
   - Collaborative workflow management
   - Progress monitoring and reporting
   - Team coordination and communication

CryptPad Integration:
1. Communication Integration:
   - Link CryptPad with secure messaging
   - Coordinate document work through Matrix/Element
   - Use OnionShare for large file transfers
   - Integrate with project management workflows

2. Backup and Export:
   - Regular document backup procedures
   - Export to encrypted archives
   - Offline document storage
   - Recovery and restoration procedures

3. Workflow Automation:
   - Document templates and standards
   - Automated backup and archiving
   - Integration with other collaboration tools
   - Workflow monitoring and optimization

OnionShare Security Features:
1. Tor Hidden Services:
   - Anonymous file sharing over Tor network
   - No central servers or intermediaries
   - Sender location and identity protection
   - Censorship resistance and availability

2. Ephemeral Sharing:
   - Automatic shutdown after download
   - Time-limited sharing windows
   - One-time download capability
   - No persistent file storage

3. Access Control:
   - Password protection for shared files
   - Custom URLs for additional security
   - Download monitoring and logging
   - Automatic security measures

OnionShare File Sharing Process:
1. File Preparation:
   - Create encrypted archive of files to share
   - Remove metadata from files
   - Verify file integrity and content
   - Organize files for efficient sharing

2. OnionShare Configuration:
   - Launch OnionShare application
   - Add files or folders to share
   - Configure security settings
   - Generate sharing URL and password

3. Secure Distribution:
   - Share URL through secure communication channel
   - Share password through separate secure channel
   - Provide download instructions and verification
   - Monitor for successful download completion

4. Post-Sharing Security:
   - Verify automatic shutdown after download
   - Clear OnionShare logs and temporary files
   - Confirm recipient received files successfully
   - Document transfer for operational records

OnionShare Advanced Features:
1. Website Hosting:
   - Host static websites anonymously
   - Share information without file downloads
   - Temporary website deployment
   - Anonymous content distribution

2. Receive Mode:
   - Anonymous file upload capability
   - Secure submission systems
   - Whistleblower and leak platforms
   - Anonymous feedback collection

3. Chat Mode:
   - Anonymous chat rooms
   - Temporary communication channels
   - Group coordination without accounts
   - Emergency communication systems

Security Configuration Checklist:
□ Enable password protection for all shares
□ Set automatic shutdown after download
□ Configure short expiration times
□ Disable public mode for sensitive files
□ Enable stealth mode for additional security
□ Use custom titles and descriptions carefully
□ Monitor download activity and logs
□ Clear temporary files after sharing

OnionShare OpSec Procedures:
1. File Preparation:
   - Encrypt files before adding to OnionShare
   - Remove all metadata and identifying information
   - Use generic filenames and folder structures
   - Verify file content for security implications

2. Sharing Security:
   - Generate strong passwords for file protection
   - Use secure channels for URL and password distribution
   - Verify recipient identity before sharing
   - Monitor sharing activity for anomalies

3. Post-Sharing Cleanup:
   - Verify automatic shutdown and file deletion
   - Clear OnionShare application logs
   - Remove temporary files and caches
   - Document successful transfer completion

OnionShare Integration Strategies:
1. Communication Integration:
   - Coordinate file sharing through secure messaging
   - Use Matrix/Element for sharing coordination
   - Integrate with CryptPad for document collaboration
   - Link with project management workflows

2. Backup and Archiving:
   - Use OnionShare for secure backup distribution
   - Anonymous archival and storage systems
   - Emergency document distribution
   - Disaster recovery file sharing

3. Operational Integration:
   - Intelligence sharing and distribution
   - Resource and material distribution
   - Training material and documentation sharing
   - Emergency communication and coordination

Encrypted Cloud Storage Options:
1. Mega:
   - Client-side encryption with user-controlled keys
   - 20 GB free storage, paid plans available
   - File sharing with password protection
   - Browser and mobile app access

2. Proton Drive:
   - Zero-access encryption architecture
   - Integration with ProtonMail ecosystem
   - Swiss privacy laws and jurisdiction
   - End-to-end encrypted file sharing

3. Tresorit:
   - Business-focused encrypted storage
   - Advanced access controls and permissions
   - Compliance with privacy regulations
   - Enterprise security features

4. SpiderOak:
   - Zero-knowledge architecture
   - Cross-platform synchronization
   - Version history and backup features
   - Business and enterprise plans

Cloud Storage Security Assessment:
1. Encryption Implementation:
   - Client-side encryption with user-controlled keys
   - Zero-knowledge architecture
   - Strong encryption algorithms and key lengths
   - Secure key management and storage

2. Privacy and Jurisdiction:
   - Privacy-friendly legal jurisdiction
   - No data retention or sharing requirements
   - Transparent privacy policies
   - Independent security audits

3. Access Controls:
   - Strong authentication and access controls
   - Two-factor authentication support
   - Granular sharing permissions
   - Activity monitoring and logging

4. Operational Security:
   - Secure account creation and management
   - Anonymous payment options
   - Tor and VPN compatibility
   - Data portability and export options

Anonymous Account Setup:
1. Network Security:
   - Use Tor Browser for account creation
   - Connect through VPN for additional protection
   - Use public WiFi unconnected to identity
   - Avoid home or work network connections

2. Account Information:
   - Use temporary email address for registration
   - Provide minimal or false personal information
   - Use strong, unique passwords
   - Enable two-factor authentication

3. Payment Security:
   - Use anonymous payment methods when possible
   - Cryptocurrency payments for anonymity
   - Prepaid cards purchased with cash
   - Avoid linking to personal financial accounts

Cloud Storage Security Settings:
□ Enable two-factor authentication
□ Use strong, unique passwords
□ Configure secure recovery options
□ Enable login notifications and monitoring
□ Review and configure sharing permissions
□ Set up secure backup and recovery
□ Configure automatic logout and session timeouts
□ Review privacy and security settings regularly

Secure File Preparation:
1. Encryption:
   - Encrypt sensitive files before upload
   - Use strong encryption algorithms (AES-256)
   - Implement secure key management
   - Regular key rotation for long-term storage

2. Metadata Removal:
   - Strip metadata from all files
   - Use generic filenames and folder structures
   - Remove identifying information and traces
   - Sanitize file content for security implications

3. Organization:
   - Use consistent naming conventions
   - Implement logical folder structures
   - Apply security classifications
   - Document file organization and access

Secure Sharing Procedures:
1. Permission Management:
   - Use minimum necessary permissions
   - Implement time-limited access when possible
   - Regular review and cleanup of shared files
   - Monitor file access and download activity

2. Sharing Security:
   - Use password protection for shared files
   - Share access credentials through secure channels
   - Verify recipient identity before sharing
   - Monitor sharing activity for anomalies

3. Collaboration Protocols:
   - Establish clear collaboration guidelines
   - Coordinate file access and editing
   - Implement version control procedures
   - Document collaboration activities

Cloud Storage Backup Strategy:
1. Local Backups:
   - Maintain encrypted local copies of critical files
   - Regular backup verification and testing
   - Secure backup storage and access controls
   - Offline backup for maximum security

2. Multi-Provider Strategy:
   - Use multiple cloud storage providers
   - Distribute files across different services
   - Implement redundancy for critical files
   - Regular synchronization and consistency checks

3. Recovery Procedures:
   - Document recovery procedures and access
   - Test recovery procedures regularly
   - Maintain secure access to recovery credentials
   - Plan for provider service disruption

Cloud Storage Monitoring:
1. Access Monitoring:
   - Regular review of account activity logs
   - Monitor for unauthorized access attempts
   - Track file access and sharing activity
   - Investigate anomalies and suspicious activity

2. Security Maintenance:
   - Regular password and credential updates
   - Security setting review and updates
   - Software and application updates
   - Provider security update monitoring

3. Compliance and Cleanup:
   - Regular file review and cleanup
   - Remove obsolete and unnecessary files
   - Update access permissions and sharing
   - Document retention and disposal procedures

Online Dead Drop Methods:
1. Temporary File Hosting:
   - Anonymous file upload services
   - Time-limited file availability
   - Password protection and encryption
   - No registration or account requirements

2. Public File Sharing:
   - Anonymous uploads to public platforms
   - Steganography in public images
   - Hidden data in public documents
   - Coded filenames and locations

3. Email Dead Drops:
   - Shared email accounts with draft messages
   - Temporary email services
   - Encrypted email with delayed delivery
   - Anonymous email forwarding services

4. Social Media Dead Drops:
   - Hidden data in social media posts
   - Steganography in public images
   - Coded messages in public forums
   - Anonymous file sharing through platforms

Offline Dead Drop Methods:
1. Physical Media:
   - USB drives in predetermined locations
   - SD cards hidden in public spaces
   - Encrypted data on physical media
   - QR codes with encrypted data

2. Network Dead Drops:
   - WiFi networks with shared files
   - Bluetooth file sharing in public spaces
   - Local network file sharing
   - Mesh network file distribution

3. Hybrid Systems:
   - Combination of online and offline methods
   - Multiple redundant channels
   - Backup and verification systems
   - Emergency fallback procedures

Dead Drop Establishment:
1. Location Selection:
   - Choose publicly accessible locations
   - Avoid surveillance and monitoring
   - Ensure reliable access for all parties
   - Plan for multiple backup locations

2. Security Configuration:
   - Implement strong encryption for all data
   - Use secure authentication and verification
   - Establish access protocols and timing
   - Plan for compromise detection and response

3. Communication Protocols:
   - Establish signaling systems for availability
   - Coordinate access timing and procedures
   - Implement verification and confirmation
   - Plan for emergency communication

Dead Drop OpSec Procedures:
1. Access Security:
   - Use different identities for different drops
   - Vary access timing and patterns
   - Monitor for surveillance and compromise
   - Implement counter-surveillance measures

2. Data Security:
   - Encrypt all data before placement
   - Use strong authentication and verification
   - Implement data integrity checking
   - Plan for secure data destruction

3. Communication Security:
   - Use coded language for coordination
   - Separate channels for different purposes
   - Verify all communications and instructions
   - Monitor for interception and compromise

Data Hiding Methods:
1. Image Steganography:
   - Hide data in image files
   - Use steganography tools (steghide, outguess)
   - Embed in publicly posted images
   - Maintain image quality and appearance

2. Document Steganography:
   - Hide data in document metadata
   - Use invisible text and formatting
   - Embed in publicly available documents
   - Maintain document functionality

3. Audio/Video Steganography:
   - Hide data in multimedia files
   - Use least significant bit encoding
   - Embed in publicly shared media
   - Maintain media quality and playback

Dead Drop Management:
1. Regular Monitoring:
   - Check dead drop status and availability
   - Monitor for compromise or interference
   - Verify data integrity and accessibility
   - Update security measures as needed

2. Maintenance Procedures:
   - Regular cleanup and sanitization
   - Update encryption and security measures
   - Refresh locations and access methods
   - Test backup and recovery procedures

3. Incident Response:
   - Detect and respond to compromise
   - Implement emergency procedures
   - Activate backup systems and locations
   - Investigate and document incidents

Dead Drop Lifecycle:
1. Establishment:
   - Plan and configure dead drop systems
   - Test functionality and security
   - Train participants in procedures
   - Document access and protocols

2. Operation:
   - Regular use and monitoring
   - Maintenance and security updates
   - Incident response and recovery
   - Performance optimization

3. Retirement:
   - Secure decommissioning procedures
   - Data sanitization and destruction
   - Location cleanup and restoration
   - Documentation and lessons learned

Secure Version Control Requirements:
1. Encryption:
   - All document versions encrypted at rest
   - Secure transmission of changes and updates
   - Client-side encryption when possible
   - Strong key management and protection

2. Access Control:
   - Role-based access to documents and versions
   - Granular permissions for different operations
   - Authentication and authorization controls
   - Audit logging and monitoring

3. Anonymity and Privacy:
   - Anonymous or pseudonymous contributions
   - Metadata protection and minimization
   - Location and timing privacy
   - Identity separation and compartmentalization

4. Integrity and Authenticity:
   - Cryptographic verification of changes
   - Digital signatures for accountability
   - Tamper detection and prevention
   - Change attribution and verification

Version Control Approaches:
1. Centralized Model:
   - Single authoritative repository
   - Centralized access control and management
   - Simplified coordination and synchronization
   - Single point of failure and control

2. Distributed Model:
   - Multiple repository copies
   - Decentralized collaboration and synchronization
   - Resilience and redundancy
   - Complex coordination and conflict resolution

3. Hybrid Model:
   - Combination of centralized and distributed features
   - Flexible access and collaboration options
   - Balanced security and usability
   - Adaptable to different operational requirements

Secure Document Workflow:
1. Document Creation:
   - Create documents in secure environment
   - Apply appropriate security classifications
   - Remove metadata and identifying information
   - Initialize version control tracking

2. Collaboration:
   - Clone repository to secure local environment
   - Make changes using secure editing tools
   - Commit changes with descriptive messages
   - Push changes through secure channels

3. Review and Approval:
   - Review changes through secure communication
   - Approve changes through established procedures
   - Merge approved changes to main branch
   - Document approval and decision-making

4. Distribution:
   - Export approved versions for distribution
   - Apply final security measures and encryption
   - Distribute through secure channels
   - Monitor access and usage

Document Change Management:
1. Change Proposal:
   - Identify need for document changes
   - Propose changes through secure channels
   - Review and approve change proposals
   - Assign responsibility for implementation

2. Change Implementation:
   - Create feature branch for changes
   - Implement changes following security guidelines
   - Test and verify changes
   - Submit changes for review and approval

3. Change Review:
   - Review changes for content and security
   - Verify compliance with guidelines and standards
   - Approve or request modifications
   - Merge approved changes to main branch

4. Change Documentation:
   - Document changes and rationale
   - Update version numbers and metadata
   - Communicate changes to stakeholders
   - Archive change documentation

Document Conflict Resolution:
1. Conflict Detection:
   - Identify conflicting changes and versions
   - Assess impact and implications
   - Notify affected parties and stakeholders
   - Initiate resolution procedures

2. Conflict Analysis:
   - Analyze conflicting changes and requirements
   - Identify root causes and contributing factors
   - Assess options and alternatives
   - Develop resolution strategy

3. Conflict Resolution:
   - Implement agreed-upon resolution
   - Update documents and version control
   - Communicate resolution to stakeholders
   - Document lessons learned and improvements

4. Prevention:
   - Improve coordination and communication
   - Update procedures and guidelines
   - Provide additional training and support
   - Monitor for recurring issues

Version Control Security:
1. Repository Protection:
   - Encrypt repository data at rest
   - Secure transmission and access protocols
   - Strong authentication and access controls
   - Regular security audits and monitoring

2. Access Management:
   - Role-based access controls
   - Principle of least privilege
   - Regular access review and cleanup
   - Secure credential management

3. Backup and Recovery:
   - Regular encrypted backups
   - Secure backup storage and access
   - Tested recovery procedures
   - Disaster recovery planning

4. Monitoring and Auditing:
   - Access logging and monitoring
   - Change tracking and attribution
   - Security incident detection and response
   - Compliance monitoring and reporting

Version Control OpSec:
1. Identity Management:
   - Use pseudonyms for version control
   - Separate identities for different projects
   - Avoid linking to real identities
   - Regular identity rotation and cleanup

2. Communication Security:
   - Coordinate version control through secure channels
   - Separate communication for different purposes
   - Verify all communications and instructions
   - Monitor for interception and compromise

3. Device Security:
   - Use dedicated devices for version control
   - Secure device configuration and management
   - Regular security updates and maintenance
   - Secure disposal and sanitization

Collaborative Security Framework:
1. Roles and Responsibilities:
   - Document owners and administrators
   - Content contributors and editors
   - Reviewers and approvers
   - Security officers and monitors

2. Access Controls:
   - Role-based access permissions
   - Document classification and handling
   - Time-limited and conditional access
   - Regular access review and cleanup

3. Security Procedures:
   - Document creation and classification
   - Secure sharing and distribution
   - Change management and approval
   - Incident response and recovery

4. Monitoring and Compliance:
   - Activity monitoring and logging
   - Compliance verification and auditing
   - Security incident detection and response
   - Continuous improvement and optimization

Protocol Development Process:
1. Requirements Analysis:
   - Identify collaboration needs and objectives
   - Assess security requirements and constraints
   - Analyze stakeholder roles and responsibilities
   - Define success criteria and metrics

2. Protocol Design:
   - Develop security architecture and controls
   - Design operational procedures and workflows
   - Create training and documentation materials
   - Plan implementation and deployment

3. Testing and Validation:
   - Test protocols in safe environments
   - Validate security and operational effectiveness
   - Identify and address issues and gaps
   - Refine protocols based on testing results

4. Implementation and Monitoring:
   - Deploy protocols in operational environment
   - Monitor effectiveness and compliance
   - Provide ongoing training and support
   - Continuously improve and optimize

Document Classification Framework:
1. Classification Levels:
   - Public: No restrictions on distribution
   - Internal: Organization members only
   - Restricted: Specific roles and need-to-know
   - Classified: Highest security, minimal access

2. Handling Requirements:
   - Storage and transmission security
   - Access controls and permissions
   - Sharing and distribution procedures
   - Retention and disposal requirements

3. Marking and Labeling:
   - Clear classification markings
   - Handling instruction labels
   - Distribution and access restrictions
   - Review and declassification dates

Document Lifecycle Security:
1. Creation:
   - Security classification assignment
   - Initial access control configuration
   - Metadata and content security review
   - Version control initialization

2. Collaboration:
   - Secure sharing and access procedures
   - Change management and approval
   - Version control and tracking
   - Security monitoring and compliance

3. Review and Approval:
   - Content review and verification
   - Security assessment and clearance
   - Approval and authorization procedures
   - Final version preparation and distribution

4. Archival and Disposal:
   - Long-term storage and preservation
   - Access control maintenance
   - Secure disposal and destruction
   - Documentation and record keeping

Collaboration Workflow:
1. Project Initiation:
   - Define collaboration objectives and scope
   - Identify participants and roles
   - Establish security requirements and procedures
   - Set up collaboration infrastructure and tools

2. Document Development:
   - Create initial documents and structure
   - Assign roles and responsibilities
   - Implement security controls and procedures
   - Begin collaborative development process

3. Review and Revision:
   - Regular review and feedback cycles
   - Change management and approval
   - Version control and tracking
   - Quality assurance and verification

4. Finalization and Distribution:
   - Final review and approval
   - Security clearance and classification
   - Distribution and access management
   - Monitoring and maintenance

Collaboration Quality Assurance:
1. Content Quality:
   - Accuracy and completeness verification
   - Consistency and standardization
   - Clarity and readability assessment
   - Technical and factual review

2. Security Quality:
   - Security classification verification
   - Access control validation
   - Operational security compliance
   - Risk assessment and mitigation

3. Process Quality:
   - Procedure compliance verification
   - Workflow efficiency assessment
   - Participant satisfaction evaluation
   - Continuous improvement identification

Training Program Components:
1. Security Awareness:
   - Document classification and handling
   - Operational security procedures
   - Threat awareness and mitigation
   - Incident reporting and response

2. Technical Training:
   - Collaboration tool usage and configuration
   - Security feature implementation
   - Troubleshooting and support
   - Best practices and optimization

3. Procedural Training:
   - Workflow and process procedures
   - Role responsibilities and expectations
   - Quality assurance and compliance
   - Communication and coordination

4. Ongoing Support:
   - Regular training updates and refreshers
   - Technical support and assistance
   - Procedure clarification and guidance
   - Performance feedback and improvement

Collaboration Support System:
1. Technical Support:
   - Help desk and troubleshooting
   - System administration and maintenance
   - Security monitoring and response
   - Performance optimization and tuning

2. Procedural Support:
   - Process guidance and clarification
   - Workflow optimization and improvement
   - Compliance monitoring and enforcement
   - Training and development support

3. Security Support:
   - Security incident response and investigation
   - Risk assessment and mitigation
   - Security awareness and education
   - Compliance auditing and verification