Segurança contra Cadastros não humanos, de forma aleatória e com somatoria, ótimo para inclusão em seu formulário, fácil a adaptação não necessita o uso de plugin.
OBS: Captcha: é um mecanismo que garante que as edições das páginas sejam feita apenas por seres humanos e não por programas (bots) mal intencionados.
<% '----------------------------------------------------------------------- '----------------------Script desenvolvido por ------------------------- '----------------------Heber Almeida------------------------------------ '----------------------heber@heberonline.com.br------------------------- '----------------------www.heberalmeida.com----------------------------- '----------------------------------------------------------------------- %> <% Call Com_CreatValidCode("GetCode") Sub Com_CreatValidCode(pSN) ' Proibição de cache Response.Expires = -9999 Response.AddHeader "Pragma","no-cache" Response.AddHeader "cache-ctrol","no-cache" 'Response.ContentType = "Image/BMP" Randomize Dim i, ii, iii Const cOdds = 1 ' Diversos ponto probabilidade Const cAmount = 13 ' O número de texto Const cCode = "0123456789+=?" ' Cor dados (caracteres, background) Dim vColorData(1),vColorRandom(10) 'vColorData(0) = ChrB(Int(Rnd*155)+100) & ChrB(Int(Rnd*155)+100) & ChrB(Int(Rnd*155)+100) vColorRandom(0)=ChrB(150) & ChrB(0) & ChrB(0) vColorRandom(1)=ChrB(0) & ChrB(150) & ChrB(0) vColorRandom(2)=ChrB(0) & ChrB(0) & ChrB(150) vColorRandom(3)=ChrB(0) & ChrB(50) & ChrB(150) vColorRandom(4)=ChrB(150) & ChrB(50) & ChrB(0) vColorRandom(5)=ChrB(150) & ChrB(0) & ChrB(150) vColorRandom(6)=ChrB(150) & ChrB(100) & ChrB(10) vColorRandom(7)=ChrB(150) & ChrB(40) & ChrB(120) vColorRandom(8)=ChrB(150) & ChrB(0) & ChrB(250) vColorRandom(9)=ChrB(100) & ChrB(100) & ChrB(100) vColorRandom(10)=ChrB(50) & ChrB(50) & ChrB(50) vColorData(0) = vColorRandom(0) vColorData(1) = ChrB(250) & ChrB(250) & ChrB(255) Dim vCode(6),vCodes,vCodeColors(6) For i = 0 To 6 vCodeColors(i)=vColorRandom(Int(Rnd * 10)) Next vCode(0) = Int(Rnd*8)+1 vCode(1) = Int(Rnd*9) vCode(2) = 10 vCode(3) = Int(Rnd*8)+1 vCode(4) = Int(Rnd*9) vCode(5) = 11 vCode(6) = 12 Session(pSN) = vCode(0)*10+vCode(1)+vCode(3)*10+vCode(4) Dim vNumberData(12) vNumberData(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111" vNumberData(1) = "1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111" vNumberData(2) = "1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011" vNumberData(3) = "1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111" vNumberData(4) = "1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011" vNumberData(5) = "1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111" vNumberData(6) = "1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111" vNumberData(7) = "1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111" vNumberData(8) = "1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111" vNumberData(9) = "1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111" vNumberData(10) = "1111111111111101111111110111111111011111100000001111110111111111011111111101111111110111111111111111" vNumberData(11) = "1111111111111111111111111111111000000001111111111111111111111000000001111111111111111111111111111111" vNumberData(12) = "1110000111110011001111011110111111111011111111001111111001111111001111111111111111110011111111001111" Response.BinaryWrite ChrB(66) & ChrB(77) & ChrB(166) & ChrB(8) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_ ChrB(0) & ChrB(0) & ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) &_ ChrB(0) & ChrB(0) & ChrB(72) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(10) & ChrB(0) &_ ChrB(0) & ChrB(0) & ChrB(1) & ChrB(0) Response.BinaryWrite ChrB(24) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(112) & ChrB(8) &_ ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) &_ ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_ ChrB(0) & ChrB(0) For i = 9 To 0 Step -1 For ii = 0 To 6 For iii = 1 To 10 vColorData(0)=vCodeColors(ii) If Rnd * 99 + 1 < cOdds Then Response.BinaryWrite vColorData(0) Else Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1)) End If Next Next Response.BinaryWrite vColorData(1) & vColorData(1) Next End Sub %>