2 results about "Email encryption" patented technology

One variation of a method for end-to-end encryption of electronic mail includes: receiving an email encrypted according to a first encryption protocol and designating a recipient within an external domain; verifying encryption protocol supported by the recipient's mail client; in response to a recipient exclusion database identifying the recipient, encrypting the email to a less-robust encryption protocol supported by the recipient mail client and transmitting the email to the recipient; in response to the recipient exclusion database excluding the recipient and the recipient mail client supporting the first encryption protocol, transmitting the email encrypted according to the first encryption protocol to the recipient; and, in response to the recipient exclusion database excluding the recipient and the recipient mail client not supporting the first encryption protocol, generating a notification email including a hyperlink to a secure webpage containing content of the email and transmitting the notification email to the recipient.

This invention belongs to the field of information and communication technology, and discloses an email encryption method, decryption method, and device. The email encryption method includes: in response to an email sending request, encrypting plaintext to obtain ciphertext; converting at least a portion of the ciphertext into a different modality than the current modality; simultaneously generating additional information, including the encryption algorithm used, the position information of the at least a portion before and after the modality conversion, and the modality conversion rules; and sending the encrypted and modality-converted ciphertext, along with the additional information. This invention introduces modality conversion into the email encryption process, increasing encryption complexity and improving the confidentiality and security of email information.