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Email Security

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Email Security Laleh Tashakori
 
An overview of Internet E-mail
 
 
Secrecy
 
Integrity
 
Solutions for Security Problems in Internet E-mail Provided by ITSC
 
Support Secure POP? Support Secure IMAP? No Yes Netscape 6 or above Yes Yes Outlook Express 5.0 or above No No Netscape 4.7 No No Eudora 5.1
 
 
 
 
Digital Certificates and keys
 
 
 
 
Weaknesses of digital keys
 
 
PGP
 
Mobile email security
 
 
 
 
Encryption
Digital Signature Public Key Private Key Public Key can be distributed Private Key should be secret PKI Public Key Infrustracture
Encryption
Certification
None Secure Model Bob John Hacker Receiving changing Re-sending
Secure Model Bob Hacker John
A Signed by His Private Key B C D E F Encrypted by B,C,D,F Public Key
Server
ISP Yahoo login page Client DNS server Router Yahoo mail server
Yahoo fake login page ISP Client DNS server Router Yahoo mail server Yahoo fake server
Data Exchanging User name : -- Password : --- Catch user Confidential Information User name : administrator Password : =44gtfDs43 Can affect information ,[object Object],[object Object],None Secure Model Client Server Sniffer Can see the screen http session pocket
Data Exchanging Secure Model Can not read data because he doesn’t have the server’s private key . Client Sniffer https session pocket Server
مواردی که در زمان ورود کاربر به يک شبکه امن مورد بررسي قرار مي گيرد . معتبر بودن صادر کننده گواهينامه درصورتيکه صادر کننده گواهينامه معتبر نباشد پيام خطا نمايش داده ميشود تاريخ اعتبار در صورت گذشتن از زمان تاريخ اعتبار گواهينامه عدم اعتبار آن به کاربر اعلام ميشود استفاده کننده نام سايت استفاده کننده بايستی با نام مندرج در گواهينامه يکسان باشد در غير اينصورت پيغام خطا داده مي شود
 
 

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En vedette

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En vedette (6)

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Email Security