O que é MD5 ?
Autor: Lucas Pettine | Publicado: 2010-11-10T08:52:00-08:00

O que é MD5 ? 
Muitas pessoas ja me perguntaram o que é md5!
Então vamos a Respota!
O que é MD5 ? 
MD5 é um esquema de encriptação de dados, em que transforma o dado em um codigo.
Para que serve ? 
Serve para:
Exemplo: Quando você cria um login e senha, utilizando um programa/site com md5, o programa/site ira converter a senha para um codigo especifico, criptografado, e armazena-lo no seu banco de dados.
Vantagens ?
Os servidores com base na versão 99.6XT utilizam MD5 para aumentar a segurança. isso tambem aumenta a segurança dos sites de Muonline.
Desvantagens ? 

Colocar um site em md5 apenas complica um pouco mais o seu desenvolvimento, e a grande maioria dos sites de muonline são sem md5. então pra evitar mais trabalho com o site, alguns desenvolvedores retiram o md5 dos seus servidores, substituindo arquivos, tabelas e procedimentos do banco de dados, diminuindo a segurança geral, tanto do site quanto do servidor.
Dica:
Faça seu Site sem MD5! 
Retirando MD5 de seu servido., apenas rode está query
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[MANG_INFO]') and 
OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[MANG_INFO]
GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[MEMB_INFO]') and 
OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[MEMB_INFO]
GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[MEMB_OUT]') and 
OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[MEMB_OUT]
GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[MembInfoModify]') and 
OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[MembInfoModify]
GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[VI_CURR_INFO]') and 
OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[VI_CURR_INFO]
GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[VI_FQNW_INFO]') and 
OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[VI_FQNW_INFO]
GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[VI_MIDS_INFO]') and 
OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[VI_MIDS_INFO]
GO

CREATE TABLE [dbo].[MANG_INFO] (
[mang_guid] [int] NOT NULL ,
[mang___id] [nvarchar] (15) COLLATE Polish_CI_AS NOT NULL ,
[mang__pwd] [nvarchar] (15) COLLATE Polish_CI_AS NOT NULL ,
[mang_name] [nvarchar] (20) COLLATE Polish_CI_AS NOT NULL ,
[mail_addr] [nvarchar] (50) COLLATE Polish_CI_AS NOT NULL ,
[levl_name] [nvarchar] (30) COLLATE Polish_CI_AS NULL ,
[part_name] [nvarchar] (30) COLLATE Polish_CI_AS NULL ,
[auth_code] [nvarchar] (30) COLLATE Polish_CI_AS NULL ,
[appl_days] [nvarchar] (8) COLLATE Polish_CI_AS NOT NULL ,
[ctl1_code] [nvarchar] (1) COLLATE Polish_CI_AS NOT NULL ,
[Group_code] [nvarchar] (2) COLLATE Polish_CI_AS NULL ,
[dep_code] [nvarchar] (4) COLLATE Polish_CI_AS NOT NULL ,
[perm] [int] NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[MEMB_INFO] (
[memb_guid] [int] IDENTITY (1, 1) NOT NULL ,
[memb___id] [varchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb__pwd] [varchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb_name] [varchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[sno__numb] [char] (13) COLLATE Polish_CI_AS NOT NULL ,
[post_code] [char] (6) COLLATE Polish_CI_AS NULL ,
[addr_info] [varchar] (50) COLLATE Polish_CI_AS NULL ,
[addr_deta] [varchar] (50) COLLATE Polish_CI_AS NULL ,
[tel__numb] [varchar] (20) COLLATE Polish_CI_AS NULL ,
[phon_numb] [varchar] (15) COLLATE Polish_CI_AS NULL ,
[mail_addr] [varchar] (50) COLLATE Polish_CI_AS NULL ,
[fpas_ques] [varchar] (50) COLLATE Polish_CI_AS NULL ,
[fpas_answ] [varchar] (50) COLLATE Polish_CI_AS NULL ,
[job__code] [char] (2) COLLATE Polish_CI_AS NULL ,
[appl_days] [datetime] NULL ,
[modi_days] [datetime] NULL ,
[out__days] [datetime] NULL ,
[true_days] [datetime] NULL ,
[mail_chek] [char] (1) COLLATE Polish_CI_AS NULL ,
[bloc_code] [char] (1) COLLATE Polish_CI_AS NOT NULL ,
[ctl1_code] [char] (1) COLLATE Polish_CI_AS NOT NULL ,
[adminaccess] [int] NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[MEMB_OUT] (
[out__guid] [int] NOT NULL ,
[memb_guid] [int] NOT NULL ,
[sno__numb] [nvarchar] (7) COLLATE Polish_CI_AS NULL ,
[memb_name] [nvarchar] (15) COLLATE Polish_CI_AS NULL ,
[appl_days] [smalldatetime] NULL ,
[ctl1_code] [nvarchar] (1) COLLATE Polish_CI_AS NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[MembInfoModify] (
[Number] [int] NOT NULL ,
[memb___id] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb__pwd] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb_name] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[sno__numb] [nvarchar] (13) COLLATE Polish_CI_AS NOT NULL ,
[tel__numb] [nvarchar] (20) COLLATE Polish_CI_AS NULL ,
[phon_numb] [nvarchar] (15) COLLATE Polish_CI_AS NULL ,
[mail_addr] [nvarchar] (50) COLLATE Polish_CI_AS NULL ,
[fpas_ques] [nvarchar] (50) COLLATE Polish_CI_AS NULL ,
[fpas_answ] [nvarchar] (50) COLLATE Polish_CI_AS NULL ,
[bloc_code] [nvarchar] (1) COLLATE Polish_CI_AS NULL
) ON [PRIMARY]

GO

CREATE TABLE [dbo].[VI_CURR_INFO] (
[ends_days] [nvarchar] (8) COLLATE Polish_CI_AS NULL ,
[chek_code] [nvarchar] (1) COLLATE Polish_CI_AS NOT NULL ,
[used_time] [int] NULL ,
[memb___id] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb_name] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb_guid] [int] NOT NULL ,
[sno__numb] [nvarchar] (18) COLLATE Polish_CI_AS NOT NULL ,
[Bill_Section] [int] NULL ,
[Bill_Value] [int] NULL ,
[Bill_Hour] [int] NULL ,
[Surplus_Point] [int] NULL ,
[Surplus_Minute] [datetime] NULL ,
[Increase_Days] [int] NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[VI_FQNW_INFO] (
[appl_code] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[ctrl_text] [nvarchar] (50) COLLATE Polish_CI_AS NULL ,
[fpas_ques] [nvarchar] (50) COLLATE Polish_CI_AS NOT NULL ,
[fpas_answ] [nvarchar] (50) COLLATE Polish_CI_AS NOT NULL ,
[appl_days] [nvarchar] (8) COLLATE Polish_CI_AS NOT NULL ,
[ctl1_code] [nvarchar] (1) COLLATE Polish_CI_AS NOT NULL ,
[memb_name] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb_guid] [int] NOT NULL ,
[fanw_guid] [int] NOT NULL ,
[memb___id] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[sno__numb] [nvarchar] (18) COLLATE Polish_CI_AS NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[VI_MIDS_INFO] (
[memb___id] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[memb_name] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[sno__numb] [nvarchar] (18) COLLATE Polish_CI_AS NOT NULL ,
[appl_days] [nvarchar] (8) COLLATE Polish_CI_AS NOT NULL ,
[chek_code] [nvarchar] (1) COLLATE Polish_CI_AS NOT NULL ,
[prev_info] [nvarchar] (50) COLLATE Polish_CI_AS NOT NULL ,
[modi_info] [nvarchar] (10) COLLATE Polish_CI_AS NOT NULL ,
[cont_text] [ntext] COLLATE Polish_CI_AS NOT NULL ,
[mids_guid] [int] NOT NULL ,
[admin_name] [nvarchar] (10) COLLATE Polish_CI_AS NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

ALTER TABLE MEMB_INFO ALTER COLUMN memb__pwd VARCHAR(10) NOT NULL
GO