庚~ wrote:
就算XP沒辦法開機
只要硬碟活著
也是可以把XP的資料備份出來
plusv wrote:
神人 !!
EFS 使用 公鑰/私鑰 加密.
wikipedia : Encrypting File System
EFS
過個幾年，硬體效能又大躍進
使用暴力破解法說不定有機會
先保留該硬碟吧，偶而讓他過個電轉一下...
plusv wrote:
慢慢等吧.
不要這樣咩....
硬體效能還是會進步的...
EFS 功能並未隨附於 Microsoft Windows XP Home Edition 中
先問樓主怎麼鎖的...
再看看這三篇有沒有幫助吧...
http://support.microsoft.com/kb/308989/zh-tw
http://support.microsoft.com/kb/308993
http://support.microsoft.com/kb/241201/zh-tw
In Windows XP and beyond, the user's RSA private key is backed up using an offline public key whose matching private key is stored in one of two places: the password reset disk (if Windows XP is not a member of a domain) or in the Active Directory (if Windows XP is a member of a domain). This means that an attacker who can authenticate to Windows XP as LocalSystem still does not have access to a decryption key stored on the PC's hard drive.
In Windows 2000, XP or later, the user's RSA private key is encrypted using a hash of the user's NTLM password hash plus the user name – use of a salted hash makes it extremely difficult to reverse the process and recover the private key without knowing the user's passphrase. Also, again, setting Syskey to mode 2 or 3 (Syskey typed in during bootup or stored on a floppy disk) will mitigate this attack, since the local user's password hash will be stored encrypted in the SAM file.
0931779549 wrote:
不要這樣咩....
硬體效能還是會進步的...
How long would it take my i-7 processor to factorise a 1024 bits number (consisting of just 2 prime factors
EFS 使用 1024 位元的 RSA 算法來加密.
i-7 CPU:
1024 位元大約需 5.34654 * 10^285 年,
不知已投胎輪迴 N 代了.
PS:
In 2009 the 768 bit number rsa-768 was cracked using about 1000 cores and 2 years of calculations. Assuming they used the General number field sieve (a very fair assumption) it would take them 7481 years to crack a 1024 bit number using the same hardware.
Or using only your i7 with this algorithm: about 3 million years. Still a long time.... ;)
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