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| 4 | XSEND(1) UNIX Programmer's Manual XSEND(1) |
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| 7 | |
| 8 | N\bNA\bAM\bME\bE |
| 9 | xsend, xget, enroll - secret mail |
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| 11 | S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS |
| 12 | x\bxs\bse\ben\bnd\bd person |
| 13 | x\bxg\bge\bet\bt |
| 14 | e\ben\bnr\bro\bol\bll\bl |
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| 16 | D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN |
| 17 | These commands implement a secure communication channel; it |
| 18 | is like _\bm_\ba_\bi_\bl(1), but no one can read the messages except the |
| 19 | intended recipient. The method embodies a public-key cryp- |
| 20 | tosystem using knapsacks. |
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| 22 | To receive messages, use _\be_\bn_\br_\bo_\bl_\bl; it asks you for a password |
| 23 | that you must subsequently quote in order to receive secret |
| 24 | mail. |
| 25 | |
| 26 | To receive secret mail, use _\bx_\bg_\be_\bt. It asks for your pass- |
| 27 | word, then gives you the messages. |
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| 29 | To send secret mail, use _\bx_\bs_\be_\bn_\bd in the same manner as the |
| 30 | ordinary mail command. (However, it will accept only one |
| 31 | target). A message announcing the receipt of secret mail is |
| 32 | also sent by ordinary mail. |
| 33 | |
| 34 | F\bFI\bIL\bLE\bES\bS |
| 35 | /usr/spool/secretmail/*.key: keys |
| 36 | /usr/spool/secretmail/*.[0-9]: messages |
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| 38 | S\bSE\bEE\bE A\bAL\bLS\bSO\bO |
| 39 | mail (1) |
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| 41 | B\bBU\bUG\bGS\bS |
| 42 | It should be integrated with ordinary mail. The announce- |
| 43 | ment of secret mail makes traffic analysis possible. |
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| 63 | Printed 7/9/88 April 29, 1985 1 |
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