Ⅰ 哪位大神會解MD5加密方式的系統。
MD5採用的是對輸入的任意長度的消息進行運算，產生一個128位的消息摘要。
你如果是使用MD5加密的話，非常好！雖然MD5的源代碼滿天飛，使用任何人都可以了解MD5的詳盡演算法描述，但是絕對沒有任何人「可以將一個經由MD5演算法加密過的字元串還原回原始的字元串」，這是真實的。
雖然說中國人「王小雲教授」破解過所謂的MD5，那她的破解也是採用碰撞原理破解，如果你採用SHA和MD5的結合，她也不可能使用它的碰撞原理將其破解，換句話說，碰撞破解並不代表她能還原原始的字元串
Ⅱ MD5採用什麼的加密方式
MD5採用的是對輸入的任意長度的消息進行運算，產生一個128位的消息摘要。
你如果是使用MD5加密的話，非常好！雖然MD5的源代碼滿天飛，使用任何人都可以了解MD5的詳盡演算法描述，但是絕對沒有任何人「可以將一個經由MD5演算法加密過的字元串還原回原始的字元串」，這是真實的。
雖然說中國人「王小雲教授」破解過所謂的MD5，那她的破解也是採用碰撞原理破解，如果你採用SHA和MD5的結合，她也不可能使用它的碰撞原理將其破解，換句話說，碰撞破解並不代表她能還原原始的字元串..
..
.
.
Ⅲ VB MD5加密解密的代碼
Dim md5 As New MD5CryptoServiceProvider
Dim username As Byte() = (New ASCIIEncoding).GetBytes(TextBox1.Text)
'轉換為哈希值Byte數組
Dim mdByte As Byte() = md5.ComputeHash(username)
'Dim mdString As String = System.BitConverter.ToString(mdByte)
Dim mdString As String = (New ASCIIEncoding).GetString(mdByte)
TextBox2.Text = mdString
md5理論上是不可破解的，要對照，只能再次加密後對照，網上也有些專門破解的網站，不過我想你要的不是那個吧
Ⅳ md5解密代碼
如果可以進入資料庫的話,你可以用另一個方法,把這個復制保存一下,然後把他的密碼改成123456加密完的字元存進去,這樣你登錄時用123456就可以了,你操作完了,再把資料庫給他還原成就可以了.我經常這么做
Ⅳ asp中用md5演算法得到的加密數據如何解密！麻煩寫個簡單的代碼演示下！
MD5 是破壞性加密，也就是說是無法由密文直接解密的。
詳細說明如下：
MD5是輸入不定長度訊息，輸出固定長度128-bits的演演算法。經過程式流程，生成四個32位元資料，最後聯合起來成為一個128-bits雜湊。基本方式為，求余、取余、調整長度、與連結變數進行迴圈運算。得出結果。一般128位元的MD5雜湊被表示為32位元十六進制數位。以下是一個43位長ASCII字母列的MD5雜湊：
MD5("The quick brown fox jumps over the lazy dog") =
即使在原文中作一個小變化（比如用c取代d）其雜湊也會發生巨大的變化：
MD5("The quick brown fox jumps over the lazy cog") =
而空文的雜湊為：
MD5("") =
MD5的弱點：
MD5較老，雜湊長度通常為128位元，隨著電腦運算能力提高，找到「碰撞」是可能的。因此，在安全要求高的場合不使用MD5。
2004年，王小雲證明MD5數位簽名演演算法可以產生碰撞。
2007年，Marc Stevens，Arjen K. Lenstra和Benne de Weger進一步指出透過偽造軟體簽名，可重復性攻擊MD5演演算法。研究者使用字首碰撞法（chosen-prefix collision），使程式前端包含惡意程式，利用後面的空間添上垃圾代碼湊出同樣的MD5 Hash值。
2007年，荷蘭埃因霍芬技術大學科學家成功把2個執行檔進行了MD5碰撞，使得這兩個執行結果不同的程式被計算出同一個MD5。
2008年12月一組科研人員透過MD5碰撞成功生成了偽造的SSL證書，這使得在https協議中伺服器可以偽造一些根CA的簽名。
Ⅵ 求MD5加密解密代碼
給你一個加密處理類吧！
public static string MD5(string str)
{
byte[] b = Encoding.Default.GetBytes(str);
b = new MD5CryptoServiceProvider().ComputeHash(b);
string ret = "";
for (int i = 0; i < b.Length; i++)
ret += b[i].ToString("x").PadLeft(2, '0');
return ret;
}
解密目前沒有，所以就靠你自己了哈！
Ⅶ C#使用Md5加密轉碼怎麼還原
MD5 加密是不可逆的..也就是說.你採用MD5加密後 是無法還原的..而且MD5加密不需要密鑰.如果你需要使用有加密密鑰,和可解密的加密方式.可以使用AES加密方式
///<summary>
///AES加密
///</summary>
///<paramname="toEncrypt"></param>
///<paramname="key"></param>
///<returns></returns>
publicstaticstringEncrypt(stringtoEncrypt,stringkey)
{
byte[]keyArray=Encoding.UTF8.GetBytes(key);
byte[]toEncryptArray=Encoding.UTF8.GetBytes(toEncrypt);
ICryptoTransformcTransform=newRijndaelManaged
{
Key=keyArray,
Mode=CipherMode.ECB,
Padding=PaddingMode.PKCS7
}.CreateEncryptor();
byte[]resultArray=cTransform.TransformFinalBlock(toEncryptArray,0,toEncryptArray.Length);
returnConvert.ToBase64String(resultArray,0,resultArray.Length);
}
///<summary>
///AES解密
///</summary>
///<paramname="toDecrypt"></param>
///<paramname="key"></param>
///<returns></returns>
publicstaticstringDecrypt(stringtoDecrypt,stringkey)
{
byte[]keyArray=UTF8Encoding.UTF8.GetBytes(key);
byte[]toEncryptArray=Convert.FromBase64String(toDecrypt);
RijndaelManagedrDel=newRijndaelManaged();
rDel.Key=keyArray;
rDel.Mode=CipherMode.ECB;
rDel.Padding=PaddingMode.PKCS7;
ICryptoTransformcTransform=rDel.CreateDecryptor();
byte[]resultArray=cTransform.TransformFinalBlock(toEncryptArray,0,toEncryptArray.Length);
returnUTF8Encoding.UTF8.GetString(resultArray);
}
Ⅷ 關於MD5值的生成與還原
MD5是一種不可逆的加密(散列)演算法，只能加密，不能還原。
MD5用同一值加密的結果每次都一樣，所以可以將用戶的密碼的MD5結果保存在資料庫中。當用戶登錄時，將登陸時的密碼MD5之後和資料庫中的進行比對，如果相同就證明用戶輸入的密碼正確。
MD5的值是可以碰撞的（兩個不同值的MD5結果相同），但幾率非常小。
不過好象有人已經發現了快速發現碰撞的方法，MD5已經不是牢不可破，不過尚未公開。
目前MD5破解的方法都是將很多字元窮舉將其MD5值保存在一個大型資料庫中，查找是依次比對。
防止自己的MD5值被窮舉出來可以通過使用長且復雜的密碼或者進行多次MD5
Ⅸ 誰能給我C#的MD5加密跟解密的代碼
MD5加密有。/// <summary>
/// 字元串MD5加密
/// </summary>
/// <param name="codeName">編碼類型</param>
/// <param name="sourceString">需要加密的字元串</param>
/// <returns>MD5加密後字元串</returns>
public static string HashString( string sourceString,string codeName)
{
byte[] source = md5.ComputeHash(Encoding.GetEncoding(codeName).GetBytes(sourceString));
StringBuilder sBuilder = new StringBuilder();
for (int i = 0; i < source.Length; i++)
{
sBuilder.Append(source[i].ToString("x"));
}
return sBuilder.ToString();
}需要添加引用using System.Security.Cryptography;MD5不是可逆性加密方式。雖然現在被破解了，但就算是這樣也不是可以輕松搞定的事。
Ⅹ MD5如何加密可不可以還原加密
md5加密單元。存成一個asp文件，並在要使用加密的aps文件中加入對該文件的引用
調用方法
密文=md5(明文)
md5 加密後不可還原，可採用比對法進行驗證
<%
Private Const BITS_TO_A_BYTE = 8
Private Const BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32
Private m_lOnBits(30)
Private m_l2Power(30)
Private Function LShift(lValue, iShiftBits)
If iShiftBits = 0 Then
LShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And 1 Then
LShift = &H80000000
Else
LShift = 0
End If
Exit Function
ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
Err.Raise 6
End If
If (lValue And m_l2Power(31 - iShiftBits)) Then
LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
Else
LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
End If
End Function
Private Function RShift(lValue, iShiftBits)
If iShiftBits = 0 Then
RShift = lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValue And &H80000000 Then
RShift = 1
Else
RShift = 0
End If
Exit Function
ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
Err.Raise 6
End If
RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)
If (lValue And &H80000000) Then
RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))
End If
End Function
Private Function RotateLeft(lValue, iShiftBits)
RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
End Function
Private Function AddUnsigned(lX, lY)
Dim lX4
Dim lY4
Dim lX8
Dim lY8
Dim lResult
lX8 = lX And &H80000000
lY8 = lY And &H80000000
lX4 = lX And &H40000000
lY4 = lY And &H40000000
lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)
If lX4 And lY4 Then
lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
ElseIf lX4 Or lY4 Then
If lResult And &H40000000 Then
lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
Else
lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
End If
Else
lResult = lResult Xor lX8 Xor lY8
End If
AddUnsigned = lResult
End Function
Private Function md5_F(x, y, z)
md5_F = (x And y) Or ((Not x) And z)
End Function
Private Function md5_G(x, y, z)
md5_G = (x And z) Or (y And (Not z))
End Function
Private Function md5_H(x, y, z)
md5_H = (x Xor y Xor z)
End Function
Private Function md5_I(x, y, z)
md5_I = (y Xor (x Or (Not z)))
End Function
Private Sub md5_FF(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_GG(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_HH(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Sub md5_II(a, b, c, d, x, s, ac)
a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))
a = RotateLeft(a, s)
a = AddUnsigned(a, b)
End Sub
Private Function ConvertToWordArray(sMessage)
Dim lMessageLength
Dim lNumberOfWords
Dim lWordArray()
Dim lBytePosition
Dim lByteCount
Dim lWordCount
Const MODULUS_BITS = 512
Const CONGRUENT_BITS = 448
lMessageLength = Len(sMessage)
lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
ReDim lWordArray(lNumberOfWords - 1)
lBytePosition = 0
lByteCount = 0
Do Until lByteCount >= lMessageLength
lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
lByteCount = lByteCount + 1
Loop
lWordCount = lByteCount \ BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)
lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)
ConvertToWordArray = lWordArray
End Function
Private Function WordToHex(lValue)
Dim lByte
Dim lCount
For lCount = 0 To 3
lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
Next
End Function
Public Function MD5(sMessage)
m_lOnBits(0) = CLng(1)
m_lOnBits(1) = CLng(3)
m_lOnBits(2) = CLng(7)
m_lOnBits(3) = CLng(15)
m_lOnBits(4) = CLng(31)
m_lOnBits(5) = CLng(63)
m_lOnBits(6) = CLng(127)
m_lOnBits(7) = CLng(255)
m_lOnBits(8) = CLng(511)
m_lOnBits(9) = CLng(1023)
m_lOnBits(10) = CLng(2047)
m_lOnBits(11) = CLng(4095)
m_lOnBits(12) = CLng(8191)
m_lOnBits(13) = CLng(16383)
m_lOnBits(14) = CLng(32767)
m_lOnBits(15) = CLng(65535)
m_lOnBits(16) = CLng(131071)
m_lOnBits(17) = CLng(262143)
m_lOnBits(18) = CLng(524287)
m_lOnBits(19) = CLng(1048575)
m_lOnBits(20) = CLng(2097151)
m_lOnBits(21) = CLng(4194303)
m_lOnBits(22) = CLng(8388607)
m_lOnBits(23) = CLng(16777215)
m_lOnBits(24) = CLng(33554431)
m_lOnBits(25) = CLng(67108863)
m_lOnBits(26) = CLng(134217727)
m_lOnBits(27) = CLng(268435455)
m_lOnBits(28) = CLng(536870911)
m_lOnBits(29) = CLng(1073741823)
m_lOnBits(30) = CLng(2147483647)
m_l2Power(0) = CLng(1)
m_l2Power(1) = CLng(2)
m_l2Power(2) = CLng(4)
m_l2Power(3) = CLng(8)
m_l2Power(4) = CLng(16)
m_l2Power(5) = CLng(32)
m_l2Power(6) = CLng(64)
m_l2Power(7) = CLng(128)
m_l2Power(8) = CLng(256)
m_l2Power(9) = CLng(512)
m_l2Power(10) = CLng(1024)
m_l2Power(11) = CLng(2048)
m_l2Power(12) = CLng(4096)
m_l2Power(13) = CLng(8192)
m_l2Power(14) = CLng(16384)
m_l2Power(15) = CLng(32768)
m_l2Power(16) = CLng(65536)
m_l2Power(17) = CLng(131072)
m_l2Power(18) = CLng(262144)
m_l2Power(19) = CLng(524288)
m_l2Power(20) = CLng(1048576)
m_l2Power(21) = CLng(2097152)
m_l2Power(22) = CLng(4194304)
m_l2Power(23) = CLng(8388608)
m_l2Power(24) = CLng(16777216)
m_l2Power(25) = CLng(33554432)
m_l2Power(26) = CLng(67108864)
m_l2Power(27) = CLng(134217728)
m_l2Power(28) = CLng(268435456)
m_l2Power(29) = CLng(536870912)
m_l2Power(30) = CLng(1073741824)
Dim x
Dim k
Dim AA
Dim BB
Dim CC
Dim DD
Dim a
Dim b
Dim c
Dim d
Const S11 = 7
Const S12 = 12
Const S13 = 17
Const S14 = 22
Const S21 = 5
Const S22 = 9
Const S23 = 14
Const S24 = 20
Const S31 = 4
Const S32 = 11
Const S33 = 16
Const S34 = 23
Const S41 = 6
Const S42 = 10
Const S43 = 15
Const S44 = 21
x = ConvertToWordArray(sMessage)
a = &H67452301
b = &HEFCDAB89
c = &H98BADCFE
d = &H10325476
For k = 0 To UBound(x) Step 16
AA = a
BB = b
CC = c
DD = d
md5_FF a, b, c, d, x(k + 0), S11, &HD76AA478
md5_FF d, a, b, c, x(k + 1), S12, &HE8C7B756
md5_FF c, d, a, b, x(k + 2), S13, &H242070DB
md5_FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
md5_FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
md5_FF d, a, b, c, x(k + 5), S12, &H4787C62A
md5_FF c, d, a, b, x(k + 6), S13, &HA8304613
md5_FF b, c, d, a, x(k + 7), S14, &HFD469501
md5_FF a, b, c, d, x(k + 8), S11, &H698098D8
md5_FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
md5_FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
md5_FF b, c, d, a, x(k + 11), S14, &H895CD7BE
md5_FF a, b, c, d, x(k + 12), S11, &H6B901122
md5_FF d, a, b, c, x(k + 13), S12, &HFD987193
md5_FF c, d, a, b, x(k + 14), S13, &HA679438E
md5_FF b, c, d, a, x(k + 15), S14, &H49B40821
md5_GG a, b, c, d, x(k + 1), S21, &HF61E2562
md5_GG d, a, b, c, x(k + 6), S22, &HC040B340
md5_GG c, d, a, b, x(k + 11), S23, &H265E5A51
md5_GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
md5_GG a, b, c, d, x(k + 5), S21, &HD62F105D
md5_GG d, a, b, c, x(k + 10), S22, &H2441453
md5_GG c, d, a, b, x(k + 15), S23, &HD8A1E681
md5_GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
md5_GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
md5_GG d, a, b, c, x(k + 14), S22, &HC33707D6
md5_GG c, d, a, b, x(k + 3), S23, &HF4D50D87
md5_GG b, c, d, a, x(k + 8), S24, &H455A14ED
md5_GG a, b, c, d, x(k + 13), S21, &HA9E3E905
md5_GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
md5_GG c, d, a, b, x(k + 7), S23, &H676F02D9
md5_GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A
md5_HH a, b, c, d, x(k + 5), S31, &HFFFA3942
md5_HH d, a, b, c, x(k + 8), S32, &H8771F681
md5_HH c, d, a, b, x(k + 11), S33, &H6D9D6122
md5_HH b, c, d, a, x(k + 14), S34, &HFDE5380C
md5_HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
md5_HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
md5_HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
md5_HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
md5_HH a, b, c, d, x(k + 13), S31, &H289B7EC6
md5_HH d, a, b, c, x(k + 0), S32, &HEAA127FA
md5_HH c, d, a, b, x(k + 3), S33, &HD4EF3085
md5_HH b, c, d, a, x(k + 6), S34, &H4881D05
md5_HH a, b, c, d, x(k + 9), S31, &HD9D4D039
md5_HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
md5_HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
md5_HH b, c, d, a, x(k + 2), S34, &HC4AC5665
md5_II a, b, c, d, x(k + 0), S41, &HF4292244
md5_II d, a, b, c, x(k + 7), S42, &H432AFF97
md5_II c, d, a, b, x(k + 14), S43, &HAB9423A7
md5_II b, c, d, a, x(k + 5), S44, &HFC93A039
md5_II a, b, c, d, x(k + 12), S41, &H655B59C3
md5_II d, a, b, c, x(k + 3), S42, &H8F0CCC92
md5_II c, d, a, b, x(k + 10), S43, &HFFEFF47D
md5_II b, c, d, a, x(k + 1), S44, &H85845DD1
md5_II a, b, c, d, x(k + 8), S41, &H6FA87E4F
md5_II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
md5_II c, d, a, b, x(k + 6), S43, &HA3014314
md5_II b, c, d, a, x(k + 13), S44, &H4E0811A1
md5_II a, b, c, d, x(k + 4), S41, &HF7537E82
md5_II d, a, b, c, x(k + 11), S42, &HBD3AF235
md5_II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
md5_II b, c, d, a, x(k + 9), S44, &HEB86D391
a = AddUnsigned(a, AA)
b = AddUnsigned(b, BB)
c = AddUnsigned(c, CC)
d = AddUnsigned(d, DD)
Next
'MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
MD5=LCase(WordToHex(b) & WordToHex(c)) 'I crop this to fit 16byte database password :D
End Function
%>