Source-of-leakage detectable e-mail address forming, sending and detection

An e-mail sending method for a sender to send an e-mail to a receiver, comprising the steps of:

• sending a receiver's identifier A and a sender's identifier B to a receiver's mail server AMS;
• computing a value {A, B, N}K which is encrypted by the mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from the receiver's identifier A, the sender's identifier B, and a nonce N issued by the mail server AMS, and sending the value {A, B, N}K to a receiver;
• forming an e-mail address (LD address) to be used by a sender who sends an e-mail to a receiver, by attaching a receiver's domain name to the encrypted value {A, B, N}K;
• and
• sending the formed e-mail address to the sender.

An e-mail sending method, comprising the steps of:

• disclosing a receiver's public address;
• sending the public address and a message MB for requesting a permission of communication with a sender to a receiver's mail server AMS via a sender's mail server BMS;
• causing the mail server AMS to send the message MB to a receiver;
• causing the mail server AMS to receive an address issuance permission from the receiver who received and read the message;
• computing a value {A, B, N}K which is encrypted by the mail server AMS with a secret key K of the mail server AMS from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, and sending the value {A, B, N}K to the sender via the mail server BMS;
• and
• forming an e-mail address (LD address) by attaching a receiver's domain name to the encrypted value {A, B, N}K, and sending an e-mail to a receiver.

An e-mail sending method, comprising the steps of:

• disclosing a receiver's public address;
• sending the public address and a message MB for requesting a permission of communication with a sender to a receiver's mail server AMS via a sender's mail server BMS;
• causing the mail server AMS to send the message MB to a receiver;
• causing the mail server AMS to receive an address issuance permission from the receiver who received and read the message;
• and
• computing a value {{A, B, N}K} KBP which is encrypted by the mail server AMS with a secret key K of the mail server AMS and is further encrypted with a sender's public key KBP from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, and sending the value {{A, B, N}K} KBP to the sender via the mail server BMS.

An e-mail sending method, comprising the steps of:

• in a condition where a sender knows a receiver's e-mail address (LD address) with a receiver's domain name attached to a value {A, B, N}K which is encrypted by a mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS,
• causing a mail server BMS to receive the e-mail address and a message M from a sender;
• causing the mail server BMS to send the e-mail address and the message M to the mail server AMS;
• and
• causing the mail server AMS to identify a receiver from the e-mail address using a secret key Kin, and to send the message M to the receiver.

An e-mail sending method comprising the steps of:

• in a condition where a sender knows a receiver's e-mail address (LD address) with a receiver's domain name attached to a value {A, B, N}K which is encrypted by a mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS,
• forming an e-mail address with a receiver's domain name attached to a value {{A, B, N}KAM, T}KAMP which is encrypted with a receiver's public key from the encrypted value {A, B, N}K and a timestamp T, and sending a message M;
• causing the mail server BMS to send a message M to the mail server AMS using the e-mail address;
• and
• causing the mail server AMS to identify a receiver using a public key KAMP, a secret key KAM, and a secret key KAMS of the mail server AMS and to send a message M to the receiver.

An e-mail sending method, comprising the steps of:

• causing a receiver's mailer AML to set a receiver's e-mail address in a sender's field and to send an e-mail to a mail server AMS, in response to inputting of a sender's address in a destination field of the receiver's mailer AML;
• generating an e-mail address (LD address) with a receiver's domain name attached to a value {A, B, N}K which is encrypted by a mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, and rewriting the sender's field to be filled in with the LD address;
• causing the mail server AMS, in response to any one of creating of a user extension field by a mail server AMS and creating of a user extension field by a receiver, to write a receiver's alias in the user extension field;
• causing the mail server AMS to send an e-mail having the user extension field to a mail server BMS;
• causing the mail server BMS to send an e-mail to a sender;
• causing a sender's mailer BML to receive the sent e-mail;
• causing the sender's mailer BML to recognize the user extension field, and to create a table having the contents of the user extension field regarded as a key and the contents of the sender's field regarded as a value;
• and
• causing the sender's mailer BML to rewrite the sender's field to be filled in with the contents of the user extension field, and to show the rewritten contents to a user.

An e-mail address forming system comprising:

• means for sending a receiver's identifier A and a sender's identifier B to a receiver's mail server AMS;
• means for computing a value {A, B, N}K which is encrypted by the mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from the receiver's identifier A, the sender's identifier B, and a nonce N issued by the mail server AMS, and for sending the value {A, B, N}K to a receiver;
• and
• means for forming an e-mail address (LD address) to be used by a sender who sends an e-mail to a receiver, by attaching a receiver's domain name to the encrypted value {A, B, N}K.

A mail system for sending an e-mail from a sender to a receiver, comprising:

• means for sending a receiver's identifier A and a sender's identifier B to a receiver's mail server AMS;
• means for computing a value {A, B, N}K which is encrypted by the mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from the receiver's identifier A, the sender's identifier B, and a nonce N issued by the mail server AMS, and for sending the value {A, B, N}K to a receiver;
• means for forming an e-mail address (LD address) to be used by a sender who sends an e-mail to a receiver, by attaching a receiver's domain name to the encrypted value {A, B, N}K;
• and
• means for sending the formed e-mail address to the sender.

A mail system comprising:

• means for disclosing a receiver's public address;
• means for sending the public address and a message MB for requesting a permission of communication with a sender to a receiver's mail server AMS via a sender's mail server BMS;
• means for causing the mail server AMS to send the message MB to a receiver;
• means for causing the mail server AMS to receive an address issuance permission from the receiver who received and read the message;
• means for computing a value {A, B, N}K which is encrypted by the mail server AMS with a secret key K of the mail server AMS from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, and for sending the value {A, B, N}K to the sender via the mail server BMS;
• and
• means for forming an email address (LD address) by attaching a receiver's domain name to the encrypted value {A, B, N}K, and for sending an e-mail to a receiver.

A mail system comprising:

• means for disclosing a receiver's public address;
• means for sending the public address and a message MB for requesting a permission of communication with a sender to a receiver's mail server AMS via a sender's mail server BMS;
• means for causing the mail server AMS to send the message MB to a receiver;
• means for causing the mail server AMS to receive an address issuance permission from the receiver who received and read the message;
• and
• means for computing a value {{A, B, N}K} KBP which is encrypted by the mail server AMS with a secret key K of the mail server AMS and is further encrypted with a sender's public key KBP from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, and for sending the value {{A, B, N}K} KBP to the sender via the mail server BMS.

A mail system comprising:

• in a condition where a sender knows a receiver's e-mail address (LD address) with a receiver's domain name attached to a value {A, B, N}K which is encrypted by a mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, means for causing a mail server BMS to receive the e-mail address and a message M from a sender;
• means for causing the mail server BMS to send the e-mail address and the message M to the mail server AMS;
• and
• means for causing the mail server AMS to identify a receiver from the e-mail address using a secret key KAM, and to send the message M to the receiver.

A mail system comprising:

• in a condition where a sender knows a receiver's e-mail address (LD address) with a receiver's domain name attached to a value {A, B, N}K which is encrypted by a mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, means for forming an e-mail address with a receiver's domain name attached to a value {{A, B, N}KAM, T}KAMP which is encrypted with a receiver's public key from the encrypted value {A, B, N}K and a timestamp T, and for sending a message M;
• means for causing the mail server BMS to send a message M to the mail server AMS using the e-mail address;
• and
• means for causing the mail server AMS to identify a receiver using a public key KAMP, a secret key KAM, and a secret key KAMS of the mail server AMS and to send a message M to the receiver.

A mail system comprising:

• means for causing a receiver's mailer AML to set a receiver's e-mail address in a sender's field and to send an e-mail to a mail server AMS in response to inputting of a sender's address in a destination field of the receiver's mailer AML;
• means for generating an e-mail address (LD address) with a receiver's domain name attached to a value {A, B, N}K which is encrypted by a mail server AMS with a secret key K, the secret key K being only possessed by the mail server AMS, from a receiver's identifier A, a sender's identifier B, and a nonce N issued by the mail server AMS, and for rewriting the sender's field to be filled in with the LD address;
• means for causing the mail server AMS, in response to any one of creating of a user extension field by a mail server AMS and creating of a user extension field by a receiver, to write a receiver's alias in the user extension field;
• means for causing the mail server AMS to send an e-mail having the user extension field to a mail server BMS;
• means for causing the mail server BMS to send an e-mail to a sender;
• means for causing a sender's mailer BML to receive the e-mail having been sent;
• means for causing the sender's mailer BML to recognize the user extension field, and to create a table having the contents of the user extension field regarded as a key and the contents of the sender's field regarded as a value;
• and
• means for causing the sender's mailer BML to rewrite the sender's field to be filled in with the contents of the user extension field, and to show the rewritten contents to a user.