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encryption-implementation-summary.md

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Encryption Implementation Summary

This document summarizes the implementation of end-to-end encryption in DedPaste according to the plan outlined in encryption-implementation-plan.md.

Navigation

Completed Implementation

1. Server-Side Changes (src/index.ts)

  • Added support for the /e/{id} path for encrypted pastes
  • Added endpoints for encrypted uploads (/e/upload and /e/temp)
  • Updated URL generation to include the /e/ prefix for encrypted pastes
  • Added a header to indicate if a paste is encrypted (X-Encrypted)
  • Updated the HTML homepage with documentation for encryption features

2. CLI-Side Changes (cli/index.js)

  • Added encryption options to the CLI (--encrypt, --key-file, --gen-key)
  • Implemented key management functions:
    • Key generation
    • Loading keys from files
    • Improved handling of key formats with clear user guidance
  • Implemented encryption using a hybrid approach:
    • RSA for key exchange
    • AES-256-GCM for content encryption
  • Implemented decryption functionality with proper key handling

3. Documentation Updates

  • Updated README.md with information about encryption features
  • Added examples of using encryption in the CLI
  • Added a detailed section about how the encryption works
  • Updated security considerations

4. Testing

  • Created unit tests for encryption/decryption functionality
  • Added security tests to verify encryption properties
  • Updated package.json with test dependencies and script

Security Properties

The implemented encryption solution provides:

  1. End-to-End Encryption: All encryption/decryption happens client-side
  2. Zero Knowledge: The server never sees unencrypted content or keys
  3. Forward Secrecy: Each paste uses a different symmetric key
  4. Strong Encryption: Uses industry-standard AES-256-GCM
  5. Key Security: Private keys never leave the user's device

Usage Examples

Creating an Encrypted Paste

# Using generated keys (recommended)
$ echo "secret data" | dedpaste --encrypt --gen-key

✓ Generated new key pair:
  - Private key: ~/.dedpaste/keys/private.pem
  - Public key: ~/.dedpaste/keys/public.pem

✓ Paste created successfully!
⚠️ This paste is encrypted and can only be decrypted with your private key

📋 https://paste.d3d.dev/e/AbCdEfGh

# Using existing PEM format key
$ echo "secret data" | dedpaste --encrypt --key-file ~/my-keys/public.pem

✓ Paste created successfully!
⚠️ This paste is encrypted and can only be decrypted with your private key

📋 https://paste.d3d.dev/e/AbCdEfGh

# Note: Standard SSH keys are not directly supported
# The CLI will offer to generate compatible keys if an SSH key is detected

Accessing an Encrypted Paste

$ dedpaste get https://paste.d3d.dev/e/AbCdEfGh

⚠️ This paste is encrypted
Enter path to private key [~/.dedpaste/keys/private.pem]: 

✓ Paste decrypted successfully:
secret data

Future Enhancements

Potential future enhancements to the encryption implementation:

  1. Add support for password-protected private keys
  2. Implement key rotation functionality
  3. Add support for sharing encrypted pastes with multiple recipients
  4. Create a web interface for encryption/decryption
  5. Add support for additional encryption algorithms

Conclusion

The encryption implementation successfully meets all the requirements outlined in the original plan. It provides a secure, end-to-end encrypted solution for sharing sensitive content through DedPaste, with all encryption and decryption happening client-side.