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An information processor receives at a communication section thereof an encrypted content decryption key generated by encrypting, by a distribution encryption key, a content decryption key for decryption of a content encrypted by a content encryption key. The received encrypted content decryption ke

An information processor receives at a communication section thereof an encrypted content decryption key generated by encrypting, by a distribution encryption key, a content decryption key for decryption of a content encrypted by a content encryption key. The received encrypted content decryption key is sent to a content key decryption section where it is decrypted. The decrypted content decryption key and copy control code are sent to a content key encryption section where they are encrypted by an encryption key which can be decrypted at an external information processor, namely, a session key, to send an encrypted content decryption key with a copy control code to the external information processor via a communication section.

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An information processor receives at a communication section thereof an encrypted content decryption key generated by encrypting, by a distribution encryption key, a content decryption key for decryption of a content encrypted by a content encryption key. The received encrypted content decryption ke

An information processor receives at a communication section thereof an encrypted content decryption key generated by encrypting, by a distribution encryption key, a content decryption key for decryption of a content encrypted by a content encryption key. The received encrypted content decryption key is sent to a content key decryption section where it is decrypted. The decrypted content decryption key and copy control code are sent to a content key encryption section where they are encrypted by an encryption key which can be decrypted at an external information processor, namely, a session key, to send an encrypted content decryption key with a copy control code to the external information processor via a communication section. g the recipient the encrypted message; and(6) sending the recipient a set of computer instructions instructing at least one computer processor of a device the recipient uses to access the encrypted message to perform the steps of:(a) accepting password input from the recipient;(b) applying the first hashing algorithm to the password input of (a) to generate the password hash value; and(c) decrypting the encrypted message with the symmetric encryption algorithm using the password hash value generated in step (b) as the symmetric key.4. A method for transmitting and receiving encrypted messages, the method comprising the steps of: (1) providing a password to the intended recipient of the message;(2) applying a first hashing algorithm to the password to generate a password hash value;(3) preparing a message to be sent;(4) applying a second hashing algorithm to the message to generate a message hash value;(5) encrypting the message and the message hash value with a symmetric encryption algorithm using the password hash value as a symmetric key;(6) sending the recipient the encrypted message and the encrypted message hash value to the recipient; and(7) sending the recipient a set of computer instructions instructing at least one computer processor of a device the recipient uses to access the encrypted message to perform the steps of:(a) accepting password input from the recipient;(b) applying the first hashing algorithm to the password input of (a) to generate the password hash value;(c) decrypting the encrypted message with the symmetric encryption algorithm using the password hash value generated in step (b) as the symmetric key;(d) decrypting the encrypted message hash value with the symmetric encryption algorithm using the password hash value generated in step (b) as a symmetric key;(e) applying the second hashing algorithm to the decrypted message to generate a hash value; and(f) comparing the message hash value obtained in step (d) with the message hash value obtained in step (e) to verify the integrity of the message received by the recipient.5. The method according to claim 4 wherein the first hashing algorithm and the second hashing algorithm are the same.6. The method according to any one of claims 1-5 wherein the step of sending the recipient the encrypted message and the step of sending the recipient a set of computer instructions comprise sending the recipient the encrypted message and the set of computer instructions as a single combined communication.7. The method according to claim 6 wherein the encrypted message is an encrypted markup-language document.8. The method according to any one of claims 1-5 wherein the step of sending the recipient the encrypted message and the step of sending the recipient a set of computer instructions comprise sending the recipient the encrypted message and the set of computer instructions as parts of a single MIME message.9. The method according to claim 8 wherein the encrypted message is an encrypted markup-language document.10. The method according to claim 9 wherein the set of computer instructions sent to the recipient are embedded in a mark-up language document.11. The method according to claim 9 wherein the markup language is selected from the group consisting of hypertext markup language (HTML), extensible markup language (XML), wireless markup language (WML), and forms markup language (FML).12. The method according to claim 11 wherein the set of computer instructions sent to the recipient are in a form selected from the group consisting of scripts and applets.13. The method according to claim 12 wherein the medium for sending is an electronic communications network.14. The method according to claim 13 wherein the electronic communications network is the Internet.15. The method according to claim 14 wherein the message is an e