1. Protection against network data interception:

• Cryptographic connection: all communications between your device and SilentSend servers are protected by SSL/TLS protocols, which eliminates the possibility of decrypting traffic even when intercepted via public Wi-Fi networks or corporate channels.
• Resistance to attacks: intruders will not be able to access the contents of emails, metadata or files thanks to strict encryption in real time.

2. Counteraction to mass monitoring:

• Refusal of hidden analysis: Unlike large platforms that scan content for targeted advertising or archiving, SilentSend uses end-to-end encryption (E2EE). This ensures that only the sender and recipient have access to the contents of emails.
• Data sovereignty: servers are located in jurisdictions with strict privacy laws, which excludes automatic access of third parties (including government agencies) to your correspondence.

3. Guarantee of integrity and authenticity:

• Digital signatures: each message is signed with a unique cryptographic key, which excludes forgery of letters and ensures the legal significance of correspondence.
• CIA triad:
• *Confidentiality*: data is available only to authorized parties.
• *Integrity*: protection from changes in transit.
• *Availability*: round-the-clock access to services without compromising security.

4. Account protection in case of compromise. Multi-level authentication, even if the password is leaked, the attacker will not be able to:

• Decrypt the correspondence history (a private key protected by a separate passphrase is required);
• Send signed messages or manage encryption keys.

5. Resistance to server hacking. Data encryption at the storage level, in case of unauthorized access to servers, all information (letters, attachments, contacts) remains unreadable due to:

• 4096-bit keys: the increased length of RSA keys provides protection against quantum and brute-force attacks;
• High-entropy generation: key generation algorithms comply with NIST and BSI standards, eliminating predictability.

1. User-side vulnerabilities
Compromised devices:
If your device is infected with malware, keyloggers or exploits (including state-level tools), end-to-end encryption and other security measures are no longer effective. An attacker can:

• Intercept entered data (passwords, keys);
• Masquerade as you to perform actions on your behalf;
• Amplify attacks through access to your account.
• Recommendation: Regularly update your OS, use antivirus software with EDR functionality and study the recommendations in our blog on cyber hygiene.

Leaked or lost passphrase:
If the passphrase is stolen (via phishing, keylogging, insecure storage) or forgotten, it is impossible to restore access to encrypted data.

2. Advanced Targeted Attacks:
High-level Man-in-the-Middle (MITM) attacks are carried out by state actors through:

• SSL/TLS certificate forgery to create SilentSend clones;
• Phishing portals that imitate the service interface.
• Countermeasures:
• Certificate verification via Certificate Pinning;
• Use of hardware tokens for authentication.

Resource-intensive nation-state attacks
Include:

• DDoS attacks: Blocking access to the service by overloading servers.
• Cryptography cracking: Attempting to decode data using quantum or supercomputer technologies.
• Backdooring: Installing hidden vulnerabilities in code or infrastructure.