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Pki (Public Key Infrastructure) ? ?? ?? ??

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Crazia Wolfgang
Crazia Wolfgang

PKI ??? ??? ???? ??? ?? ??? ???? ???. http://goo.gl/cfDsQ ??? ?? ? ???? ??? ???? ???? ????.

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Public Key Infrastructure ? ?? PKI ??
RFC 2459 Internet X.509 Public Key Infrastructure
? Message Digest ? Symmetric Key Algorithm ? Asymmetric Key Algorithm
? Message Digest (? ???? ???) ? MD5 , SHA-1 ? 160 bit output Cryptographic Hash Function
??? ???? Encryption & Decryption
Symmetric Key Algorithm ? One Key (?? ?) ? Encryption , Decryption ? ?? ｀?¨? ?? ? 3DES , AES
Plain Text Cipher Text Encryption Decryption symmetric key
Asymmetric Key Algorithm ? ? ??? ? Two Key (Private Key: ??? , Public Key: ? ??) ? Encryption ? Decryption ? ?? ?? ? ?? ? RSA (Rivest, Shamir,Adelman)
Public Key Private Key Plain Text Encrypted Text Public key Encryption Private key Decryption ??? ｀???¨ , ??? ｀???¨
Public Key Private Key Plain Text Encrypted Text Private key Encryption Public key Decryption ??? ｀?? ??¨ , ??? ｀?? ??¨
PKI ? Asymmetric Key Algorithm ? ?? ? Key ? ? (Private , Public Key) ? ?? ? Private Key (???) ???? ?? ? Public Key (???) ?? ??? ??? ? ? ? ??? ???? ?? ??? ??
In Real World
A¨s Public Key A¨s Private Key A ? ? ? ?? ??? ? ???? A ?? ??? ?? person A Plain Text ?? ??? ?? Cipher TextPlain Text ?? ???? ??? Encryption A ? ???? ｀?? ???¨ Encryption E key Plain Text E key E key A ? ???? ｀?? ???¨ Decryption Plain TextCipher Text ?? ???? ??? Decryption Plain Text send
A¨s Public Key A¨s Private Key A ? ?? ??? ??? ???? ??. person A Plain Text Digest MsgPlain Text ?? ??? Message Digest Plain Text Signature Signature A ? ???? Decryption Hash Function Digest Msg Signature A ? ???? Digest Msg ? Encryption Digest Msg Digest Msg¨Plain Text ?? ??? ?? ?? Message Digest Hash Functionsend Digest Msg =? Digest Msg¨ A ? ???? Decryption ? ?? ?? ?? Plain Text ? Hash ? ?? ??? ??
What is Certi?cate? (?? ?????)
? ???? ?? ???? ?? ? ???? ???? ????? ???.. (?? ??)
Certi?cate Authority (CA) ?? ?? ??
? ???? ?? ?? ???? ?? ???? ? ???? ? ? ??? ?? ｀???¨? ??? ? ???? ???? ??? ?? ? ??? ?? ?? ｀?? ???¨ ?? ?? ? ? ｀??? + ???¨ ??? ?? ??
?? ????? ??? ? ???? ｀??? ????¨ ??
? ???? ????? ?? ? ?? ???? ?? ????? ?? ? ???? ???? ???? ??? ??? ?? (PKCS#12)
Thank you!

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Pki (Public Key Infrastructure) ? ?? ?? ??