1. Full End-to-End Encryption for All Mail Services Creation & Implementation:

Conduct a thorough security audit of Proton Mail modules to identify any unencrypted data at rest or in transit.

Use a centralized Key Management System (KMS) leveraging Hardware Security Modules (HSMs) for secure key storage.

Generate user key pairs (RSA-4096 or ECC Curve25519) locally on client devices; private keys never leave the device unencrypted.

Encrypt all emails, attachments, and metadata with AES-256-GCM symmetric encryption.

Use OpenPGP (RSA-4096) and ECC for cross-platform compatibility and mobile efficiency.

Publish detailed technical whitepapers including encryption flowcharts, key derivation functions (Argon2id, PBKDF2), and zero-knowledge proofs to ensure transparency.

Expected Benefits:

Zero-access guarantee: Proton servers never hold decrypted user data.

Transparency and trust through published algorithms and architecture.

Future-proof security with post-quantum cryptography (CRYSTALS-Kyber, CRYSTALS-Dilithium).

1. IMAP/SMTP Support for Free Accounts via Proton Mail Bridge Creation & Implementation:

Remove IMAP/SMTP restrictions for free-tier users.

Provide downloadable Proton Mail Bridge clients for Windows, macOS, and Linux.

Enforce secure connections using TLS 1.3, HSTS, and certificate pinning.

Use OAuth 2.0 with Proof Key for Code Exchange (PKCE) and short-lived tokens for authentication.

Offer detailed step-by-step setup guides and video tutorials for popular email clients (Thunderbird, Outlook).

Expected Benefits:

Easier migration from legacy email providers.

Increased user retention and satisfaction.

Maintained end-to-end encryption even with third-party clients.

1. Enhanced Account Security Features Support hardware security keys (YubiKey, SoloKey) and biometric authentication (TouchID, FaceID, Windows Hello).

Implement adaptive multi-factor authentication triggered by risk factors (new device, unusual location).

Provide detailed login and device activity logs with options to revoke sessions remotely.

1. Alias and Permission Management Allow creation of multiple aliases with one-time keys to mask primary addresses.

Implement OAuth 2.0 scopes for app permissions (mail.read, mail.send, contacts.read).

Provide users with an app permission dashboard to monitor and revoke third-party access.

1. Automatic Email Translation with Privacy Preservation Integrate client-side or hybrid translation engines (DeepL API or proprietary models).

Encrypt email content chunks before sending to translation service; decrypt results client-side.

Support major languages including Ukrainian, Korean, Japanese, and European languages.

Add a “Translate” button in the email interface preserving end-to-end encryption.

1. Improved Search Capabilities Develop client-side encrypted indexing for fast, privacy-preserving search.

Support advanced filters: boolean operators, date ranges, sender/recipient, attachment-only searches.

1. User Education and Support Provide interactive tutorials on encryption setup, alias management, and security best practices.

Expand FAQ, community forums, and direct support channels.