Password-authenticated public key encryption and decryption

A first user processing system for password-authenticated public key decryption, the first user processing system comprising:

• a processing device and at least one-non-transitory computer-readable storage device with computer-executable instructions stored thereon that, when executed by the processor, cause the processor to:
• generate a public key and a secret key and further generate an authenticated public key using the public key and a hash of an authentication password;
• transmit the authenticated public key to a second user processing system;
• receive a ciphertext from the second user processing system, wherein the ciphertext comprises a data message encrypted using the public key, wherein the second user processing system computed the public key using the authenticated public key received from the first user processing system and an inverse hash of the authentication password;
• and
• decrypt the ciphertext using of the secret key to generate the data message,
• wherein the authenticated public key is transmitted by the first user processing system to the second user processing system via a host processing system, wherein the ciphertext is received at the first user processing system via the host processing system, and wherein the host processing system stores the authenticated public key and the ciphertext and makes the authenticated public key and the ciphertext available to the first user processing system and the second user processing system.

A computer-implemented method for password-authenticated public key encryption, the method comprising:

• receiving an authenticated public key generated by a first user processing system at a second user processing system, wherein the authenticated public key is generated using a public key and a hash of an authentication password, wherein the public key has a corresponding secret key;
• computing the public key using the authenticated public key received from the first user processing system and an inverse hash of the authentication password;
• encrypting, by the second user processing system, a data message to produce a ciphertext using the public key, wherein the ciphertext comprises the data message encrypted using the public key;
• and
• transmitting, by the second user processing system, the ciphertext to the first user processing system, wherein the first user processing system can decrypt the ciphertext using the secret key to generate the data message,
• wherein the authenticated public key is transmitted by the first user processing system to the second user processing system via a host processing system, wherein the ciphertext is received at the first user processing system via the host processing system, and wherein the host processing system stores the authenticated public key and the ciphertext and makes the authenticated public key and the ciphertext available to the first user processing system and the second user processing system.