No more fake messages

All mail sent through the Co-Mail system is fully secure. This means that all stored messages and data are encrypted, so access is not possible without correct authentication. Messages can not be intercepted or altered by third parties. All company electronic communication is combined under full secure control.

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Technical data

• Public key cryptography
  
  Co-Mail has been developed on the principles of public key cryptography. A user must have a key, which consists of two parts - public and private. The private key is kept with the user, and the public key is distributed between the user's correspondents. If anyone from the user's correspondents wants to write a secure letter to that user, he will encrypt the letter using the user's public key. When the email is received, the user decrypts it using the private key. No one can decrypt the message without the private key. It is not possible to retrieve the private key on the basis of the public key.
  
  
• Public and private keys generation process
  
  Upon registration, the Co-Mail system generates a key for the user, which consists of two parts - private and public. The public key is stored on the Co-Mail public keys server and can be accessed without a password. The private key is immediately encrypted with the use of the user-selected password as a key to encrypt. Then the private key is stored on a special private keys server. To retrieve the private key a user`s password needs to be entered. This accesses and decrypts the private key. Therefore, it is only possible to get the private key if the original password is known. The Co-Mail system does not store any passwords. So, if a password is lost or forgotten, there is no way to retrieve it.
  
  
• Delivering an encrypted message
  
  If a message is sent within Co-Mail, the system analyses the "to:" field (which contains the address of a recipient), and retrieves the recipient's public key from the public keys server. Having retrieved that public key, the client's application, which is activated on the sender's PC, generates the session key - "K". The message is then encrypted using the "K" key as an encryption key. Then the "K" key itself is encrypted with the use of the sender's public key and is attached to the body of the encrypted message. When all operations are completed, the encrypted message is sent to the recipient's mailbox.