Методи за криптиране и декриптиране

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  • 1. : Microsoft .: .: : : . 116596. - 7- , 2014.1

2. . , , . , , , , . ( , ). , . . , () , . , , . . . , . . , , . , , , - , . . . ( - " ") , . -, . , , . , , , 2 3. , , . -, , , , . , . , , , . - . , , - , "" - . , . . , , . . 1 .. 1 3 4. / ( online, ). - , - - . ( ). , . , , , , . . . , , . . , . , -. , /, . , , , . , . - , . . , web . 40 . , , .4 5. . - , . DES (Data Encryption Standart) , . . 2 .. 2 , . . , . , . , , . ( ) . . . . . . - - , . - . . . . , 5 6. . . , ( 64 ) . , . , . . , , , -, . , : , () . , . . , , . , , . 3 .. 3 - 6 7. . , . , .. . . , . . , . , . RSA . . . - . , , , , . RSA, . . RSA , . SSL, web (URLs https:// http://) . web web . , , . , web web . web . Web , . RSA . , - . . , , . , , . 7 8. . . , . , PGP SSL web. . , , . , L 64, .. L=64, |K|1019. L=128, , 1038. 1020 . 1038 , 128 , . , , , , , . . , - , , . - . . . , , , p q RSA- , p, q g DSA. , / , .8 9. , . : , ; . -, , . , . . , , , . -. , . , . , , . , , touch-memory. , , - . , , touch-memory . touch-memory 9 10. Dallas Semiconductor Inc. - 3,51 5,89 mm, 16,25 mm. , - : , 64- : - 8 ; - 48 8- . ; - 128 8192 , touch-memory; - 10 . touch-memory , -. - - , . , touch-memory , , . , . - , , , . - Card Operational Sistem. , , 1-8 Kb, 64 Kb. , , . - , , :10 11. ; ; ; . - . , . - . , , . . . . . - . , . , . , , , . - . SSL , web, . Web web . web . web , . . , , -. , 11 12. - . , . - . , . . , . , , . , . , . , . . , , , , , . , , . - . . , . . - , PGP. . 4 PGP.12 13. PGP . S/MIME (Secure Multipurpose Internet Extensions) , Netscape Communicator Internet Explorer. S/MIME . , , . S/MIME PGP . , , . S/MIME - PGP, - , Netscape Mozilla web . , . , . Blowfish, IDEA triple-DES. . , , . . , , , WinZip (www.winzip.com). . 13 14. , , , , . . . , PGP (www.pgp.com) . . , PGP . , , . PGP PGP , . , : PGP MS-DOS, Windows, Unix, Macintosh ; , , / () , ; . , , , ; () ; ; . , .. , , ; . ; 14 15. , ; () . PGP Internet . . , / : - , . ; - , , ; - , ; One-Time Pads. , , . , . , . , . AccessData (www.accessdata.com) , . , , .15 16. . . - . , , , . , . . , , . , . , , . , , . , . , . , , . , . , . .. 5 16 17. (.5), - . MD4 (Message Digest algorithm 4) , . 128 (16 ) . MD5 MD4, RFC 1321 , , "" , . NSA (National Security Agency). SHA-1 SHA (Secure Hash Algorithm) . SHA-1 160 264 MD5. SHA-1 MD5. RIPEMD , 512 , 128 160 ). , , . . SSL SSL (Secure Socket Layer) . SSL, / Netscape Navigator Microsoft Internet Explorer/. , , // , . : , , . , . 17 18. , , . , (. Verisign. com Thawte.com). , , . , , . , . SSL (. RSA). , , SSL . ( ) , . . SSL , : . , . : . . , ( , ). . , . . , , . . , , .. . . 6 .18 19. . 6 . digital hash. Hash , . , hash . , hash . . 7 hash .. 7 19 20. Hash . , . Hash . , , . , , . , RSA, . , hash , . , hash , . , hash , . , , . hash . , . , . , . , , , . , , . , , , . , , , . , . . . , , , . 20 21. 1. http://www-it.fmi.uni-sofia.bg/courses/BonI/ 2. http://www.webopedia.com/TERM/E/encryption.html 3. http://ivacompmath.blogspot.com/2007/10/blog-post.html 4. http://borisov.eu/blog/21/kriptirane-na-danni 5. http://blqqq.wordpress.com/2010/10/30/cryptography/ 6. http://www.tovaonova.com/read.php?article=31 7. http://www.bg-informatika.com/2012/09/16.html21

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