加密解密問題 |
答題得分者是:One2Free
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juneo
高階會員 ![]() ![]() ![]() ![]() 發表:103 回覆:190 積分:118 註冊:2004-05-13 發送簡訊給我 |
請教各位大大
有關於加密解密的問題
我想設計一個程式能夠輸入字串包(含空白字元)
然後依照固定模式加密 再撰寫另一程式來解碼
例如:
設定 edit1物件輸入字串 "how are you?"(原文1)
edit2 輸入 "This is a book!"(原文2)
加密規則
edit1 edit2 字串長度(包含空白) / 2
27/2=13.5 取14
設定陣列 1 2
陣列 1 內容how are you?Th
陣列 2 內容is is a book! 明文原則使用5個字串內容 空白當分隔
(1.1) (2.1) (1.2) (2.2) (1.3) 空白
^^^^此空白是程式加密的分隔 以下空格使用*代替這樣各位能比較清楚
依照上例的明文為 hiosw* **ias* r*ea** *yboo* uo?kT* ih
解碼程式再把上面的明文給還原 請問有高手能夠指點一下
因為我是新手最好能夠有程式碼能研究
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Chance36
版主 ![]() ![]() ![]() ![]() ![]() ![]() 發表:31 回覆:1033 積分:792 註冊:2002-12-31 發送簡訊給我 |
juneo 你好
參考看看 type TForm1 = class(TForm) Edit1: TEdit; Edit2: TEdit; BitBtn1: TBitBtn; Label1: TLabel; procedure BitBtn1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.BitBtn1Click(Sender: TObject); Var Str1 , Str2, Ans : String ; T,d,i : Integer ; b : Boolean; // 兩字串等長 begin Str1 := Edit1.Text; Str2 := Edit2.Text; t := Length(Str1) Length(Str2) ; d := Ceil(t/2) ; b := True ; // 兩字串等長 If t <> (d*2) Then b := False ; Str1 := Str1 Str2; Str2 := Copy(Str1,d 1,d); Str1 := Copy(Str1,1,d); SetLength(Ans,t Ceil(t/5)); i := 1; For t := 1 To d Do Begin Ans[i] := Str1[t]; Inc(i); If Trunc(i/6)*6=i Then Begin Ans[i] := ' ' ; Inc(i); End; If (t<>d) Or b Then Begin Ans[i] := Str2[t]; Inc(i); If Trunc(i/6)*6=i Then Begin Ans[i] := ' ' ; Inc(i); End; End; End; Label1.Caption := Ans; end;發表人 - chance36 於 2004/06/09 03:53:02 |
juneo
高階會員 ![]() ![]() ![]() ![]() 發表:103 回覆:190 積分:118 註冊:2004-05-13 發送簡訊給我 |
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One2Free
一般會員 ![]() ![]() 發表:26 回覆:28 積分:20 註冊:2004-05-12 發送簡訊給我 |
通过统计,你的明文很容易被破解!送你一个UNIT!
unit Des; interface uses SysUtils; type TKeyByte = array[0..5] of Byte; TDesMode = (dmEncry, dmDecry); function EncryStr(Str, Key: String): String; function DecryStr(Str, Key: String): String; function EncryStrHex(Str, Key: String): String; function DecryStrHex(StrHex, Key: String): String; const BitIP: array[0..63] of Byte = (57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7, 56, 48, 40, 32, 24, 16, 8, 0, 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6 ); BitCP: array[0..63] of Byte = ( 39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25, 32, 0, 40, 8, 48, 16, 56, 24 ); BitExp: array[0..47] of Integer = ( 31, 0, 1, 2, 3, 4, 3, 4, 5, 6, 7, 8, 7, 8, 9,10, 11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20, 21,22,23,24,23,24,25,26,27,28,27,28,29,30,31,0 ); BitPM: array[0..31] of Byte = ( 15, 6,19,20,28,11,27,16, 0,14,22,25, 4,17,30, 9, 1, 7,23,13,31,26, 2, 8,18,12,29, 5,21,10, 3,24 ); sBox: array[0..7] of array[0..63] of Byte = ( ( 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 ), ( 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 ), ( 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 ), ( 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 ), ( 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 ), ( 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 ), ( 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 ), ( 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 ) ); BitPMC1: array[0..55] of Byte = ( 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 ); BitPMC2: array[0..47] of Byte = ( 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 ); var subKey: array[0..15] of TKeyByte; implementation procedure initPermutation(var inData: array of Byte); var newData: array[0..7] of Byte; i: Integer; begin FillChar(newData, 8, 0); for i := 0 to 63 do if (inData[BitIP[i] shr 3] and (1 shl (7- (BitIP[i] and $07)))) <> 0 then newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07))); for i := 0 to 7 do inData[i] := newData[i]; end; procedure conversePermutation(var inData: array of Byte); var newData: array[0..7] of Byte; i: Integer; begin FillChar(newData, 8, 0); for i := 0 to 63 do if (inData[BitCP[i] shr 3] and (1 shl (7-(BitCP[i] and $07)))) <> 0 then newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07))); for i := 0 to 7 do inData[i] := newData[i]; end; procedure expand(inData: array of Byte; var outData: array of Byte); var i: Integer; begin FillChar(outData, 6, 0); for i := 0 to 47 do if (inData[BitExp[i] shr 3] and (1 shl (7-(BitExp[i] and $07)))) <> 0 then outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07))); end; procedure permutation(var inData: array of Byte); var newData: array[0..3] of Byte; i: Integer; begin FillChar(newData, 4, 0); for i := 0 to 31 do if (inData[BitPM[i] shr 3] and (1 shl (7-(BitPM[i] and $07)))) <> 0 then newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07))); for i := 0 to 3 do inData[i] := newData[i]; end; function si(s,inByte: Byte): Byte; var c: Byte; begin c := (inByte and $20) or ((inByte and $1e) shr 1) or ((inByte and $01) shl 4); Result := (sBox[s][c] and $0f); end; procedure permutationChoose1(inData: array of Byte; var outData: array of Byte); var i: Integer; begin FillChar(outData, 7, 0); for i := 0 to 55 do if (inData[BitPMC1[i] shr 3] and (1 shl (7-(BitPMC1[i] and $07)))) <> 0 then outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07))); end; procedure permutationChoose2(inData: array of Byte; var outData: array of Byte); var i: Integer; begin FillChar(outData, 6, 0); for i := 0 to 47 do if (inData[BitPMC2[i] shr 3] and (1 shl (7-(BitPMC2[i] and $07)))) <> 0 then outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07))); end; procedure cycleMove(var inData: array of Byte; bitMove: Byte); var i: Integer; begin for i := 0 to bitMove - 1 do begin inData[0] := (inData[0] shl 1) or (inData[1] shr 7); inData[1] := (inData[1] shl 1) or (inData[2] shr 7); inData[2] := (inData[2] shl 1) or (inData[3] shr 7); inData[3] := (inData[3] shl 1) or ((inData[0] and $10) shr 4); inData[0] := (inData[0] and $0f); end; end; procedure makeKey(inKey: array of Byte; var outKey: array of TKeyByte); const bitDisplace: array[0..15] of Byte = ( 1,1,2,2, 2,2,2,2, 1,2,2,2, 2,2,2,1 ); var outData56: array[0..6] of Byte; key28l: array[0..3] of Byte; key28r: array[0..3] of Byte; key56o: array[0..6] of Byte; i: Integer; begin permutationChoose1(inKey, outData56); key28l[0] := outData56[0] shr 4; key28l[1] := (outData56[0] shl 4) or (outData56[1] shr 4); key28l[2] := (outData56[1] shl 4) or (outData56[2] shr 4); key28l[3] := (outData56[2] shl 4) or (outData56[3] shr 4); key28r[0] := outData56[3] and $0f; key28r[1] := outData56[4]; key28r[2] := outData56[5]; key28r[3] := outData56[6]; for i := 0 to 15 do begin cycleMove(key28l, bitDisplace[i]); cycleMove(key28r, bitDisplace[i]); key56o[0] := (key28l[0] shl 4) or (key28l[1] shr 4); key56o[1] := (key28l[1] shl 4) or (key28l[2] shr 4); key56o[2] := (key28l[2] shl 4) or (key28l[3] shr 4); key56o[3] := (key28l[3] shl 4) or (key28r[0]); key56o[4] := key28r[1]; key56o[5] := key28r[2]; key56o[6] := key28r[3]; permutationChoose2(key56o, outKey[i]); end; end; procedure encry(inData, subKey: array of Byte; var outData: array of Byte); var outBuf: array[0..5] of Byte; buf: array[0..7] of Byte; i: Integer; begin expand(inData, outBuf); for i := 0 to 5 do outBuf[i] := outBuf[i] xor subKey[i]; // outBuf xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx buf[0] := outBuf[0] shr 2; //xxxxxx -> 2 buf[1] := ((outBuf[0] and $03) shl 4) or (outBuf[1] shr 4); // 4 <- xx xxxx -> 4 buf[2] := ((outBuf[1] and $0f) shl 2) or (outBuf[2] shr 6); // 2 <- xxxx xx -> 6 buf[3] := outBuf[2] and $3f; // xxxxxx buf[4] := outBuf[3] shr 2; // xxxxxx buf[5] := ((outBuf[3] and $03) shl 4) or (outBuf[4] shr 4); // xx xxxx buf[6] := ((outBuf[4] and $0f) shl 2) or (outBuf[5] shr 6); // xxxx xx buf[7] := outBuf[5] and $3f; // xxxxxx for i := 0 to 7 do buf[i] := si(i, buf[i]); for i := 0 to 3 do outBuf[i] := (buf[i*2] shl 4) or buf[i*2 1]; permutation(outBuf); for i := 0 to 3 do outData[i] := outBuf[i]; end; procedure desData(desMode: TDesMode; inData: array of Byte; var outData: array of Byte); // inData, outData 都为8Bytes,否则出错 var i, j: Integer; temp, buf: array[0..3] of Byte; begin for i := 0 to 7 do outData[i] := inData[i]; initPermutation(outData); if desMode = dmEncry then begin for i := 0 to 15 do begin for j := 0 to 3 do temp[j] := outData[j]; //temp = Ln for j := 0 to 3 do outData[j] := outData[j 4]; //Ln 1 = Rn encry(outData, subKey[i], buf); //Rn ==Kn==> buf for j := 0 to 3 do outData[j 4] := temp[j] xor buf[j]; //Rn 1 = Ln^buf end; for j := 0 to 3 do temp[j] := outData[j 4]; for j := 0 to 3 do outData[j 4] := outData[j]; for j := 0 to 3 do outData[j] := temp[j]; end else if desMode = dmDecry then begin for i := 15 downto 0 do begin for j := 0 to 3 do temp[j] := outData[j]; for j := 0 to 3 do outData[j] := outData[j 4]; encry(outData, subKey[i], buf); for j := 0 to 3 do outData[j 4] := temp[j] xor buf[j]; end; for j := 0 to 3 do temp[j] := outData[j 4]; for j := 0 to 3 do outData[j 4] := outData[j]; for j := 0 to 3 do outData[j] := temp[j]; end; conversePermutation(outData); end; ////////////////////////////////////////////////////////////// function EncryStr(Str, Key: String): String; var StrByte, OutByte, KeyByte: array[0..7] of Byte; StrResult: String; I, J: Integer; begin if (Length(Str) > 0) and (Ord(Str[Length(Str)]) = 0) then raise Exception.Create('Error: the last char is NULL char.'); if Length(Key) < 8 then while Length(Key) < 8 do Key := Key Chr(0); while Length(Str) mod 8 <> 0 do Str := Str Chr(0); for J := 0 to 7 do KeyByte[J] := Ord(Key[J 1]); makeKey(keyByte, subKey); StrResult := ''; for I := 0 to Length(Str) div 8 - 1 do begin for J := 0 to 7 do StrByte[J] := Ord(Str[I * 8 J 1]); desData(dmEncry, StrByte, OutByte); for J := 0 to 7 do StrResult := StrResult Chr(OutByte[J]); end; Result := StrResult; end; function DecryStr(Str, Key: String): String; var StrByte, OutByte, KeyByte: array[0..7] of Byte; StrResult: String; I, J: Integer; begin if Length(Key) < 8 then while Length(Key) < 8 do Key := Key Chr(0); for J := 0 to 7 do KeyByte[J] := Ord(Key[J 1]); makeKey(keyByte, subKey); StrResult := ''; for I := 0 to Length(Str) div 8 - 1 do begin for J := 0 to 7 do StrByte[J] := Ord(Str[I * 8 J 1]); desData(dmDecry, StrByte, OutByte); for J := 0 to 7 do StrResult := StrResult Chr(OutByte[J]); end; while (Length(StrResult) > 0) and (Ord(StrResult[Length(StrResult)]) = 0) do Delete(StrResult, Length(StrResult), 1); Result := StrResult; end; /////////////////////////////////////////////////////////// function EncryStrHex(Str, Key: String): String; var StrResult, TempResult, Temp: String; I: Integer; begin TempResult := EncryStr(Str, Key); StrResult := ''; for I := 0 to Length(TempResult) - 1 do begin Temp := Format('%x', [Ord(TempResult[I 1])]); if Length(Temp) = 1 then Temp := '0' Temp; StrResult := StrResult Temp; end; Result := StrResult; end; function DecryStrHex(StrHex, Key: String): String; function HexToInt(Hex: String): Integer; var I, Res: Integer; ch: Char; begin Res := 0; for I := 0 to Length(Hex) - 1 do begin ch := Hex[I 1]; if (ch >= '0') and (ch <= '9') then Res := Res * 16 Ord(ch) - Ord('0') else if (ch >= 'A') and (ch <= 'F') then Res := Res * 16 Ord(ch) - Ord('A') 10 else if (ch >= 'a') and (ch <= 'f') then Res := Res * 16 Ord(ch) - Ord('a') 10 else raise Exception.Create('Error: not a Hex String'); end; Result := Res; end; var Str, Temp: String; I: Integer; begin Str := ''; for I := 0 to Length(StrHex) div 2 - 1 do begin Temp := Copy(StrHex, I * 2 1, 2); Str := Str Chr(HexToInt(Temp)); end; Result := DecryStr(Str, Key); end; end. |
juneo
高階會員 ![]() ![]() ![]() ![]() 發表:103 回覆:190 積分:118 註冊:2004-05-13 發送簡訊給我 |
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