数据库 ENCRYPT（）加密的密码怎么验证登录

String.Format("selectencryptbycert(cert_id('c1'),'')fromtest,TextBox2.Text)这个是把你加密后的密码作为字段名来查询了吧。另外你这逻辑有很大问题呀，就算把上面的SQL改好也不行。你的逻辑是首先判断用户是否存在，然后判断密码是否存在，你都不判断用户名对应的密码是否是你输入，只是判断数据库里是否存在这个密码……

/*

1.利用对称密钥

搭配EncryptByKey进行数据jiami

使用DecryptByKey函数进行jiemi

这种方式比较适合大数据量

*/

CREATE SYMMETRIC KEY ZXC WITH ALGORITHM = AES_256 ENCRYPTION BY PASSWORD = 'ZXC123456'

OPEN SYMMETRIC KEY ZXC DECRYPTION BY PASSWORD = 'ZXC123456'

--jiami

SELECT Encryptbykey(Key_guid('ZXC'), 'YHDH_C')

--jiemi

SELECT CONVERT(VARCHAR(10), Decryptbykey(0x001B05DF93A12F4A941E64A06B9AEE94010000007582B2C772953F1A6ABC7298E126B76A22A6815115466653D11D6D1F23641DA6))

CLOSE SYMMETRIC KEY ZXC

DROP SYMMETRIC KEY ZXC

/*

2.利用非对称密钥

搭配EncryptByAsymKey进行数据jiami

使用DecryptByAsymKey函数进行jiemi

用于更高安全级别的加jiemi数据

*/

CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'XIAOMA'

CREATE ASYMMETRIC KEY ABC WITH ALGORITHM=RSA_2048 ENCRYPTION BY PASSWORD = 'ZXC123456'

ALTER ASYMMETRIC KEY ABC WITH PRIVATE KEY (DECRYPTION BY PASSWORD = 'ZXC123456')

--jiami

Select Encryptbyasymkey(Asymkey_id ('ABC'), 'ZXC123456')

SELECT CONVERT(VARCHAR(100), Decryptbyasymkey (Asymkey_id('ABC'),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

DROP ASYMMETRIC KEY ABC

DROP MASTER KEY

/*

3.利用凭证的方式

搭配EncryptByCert进行jiami

DecryptByCert函数进行jiemi

比较类似非对称密钥

*/

CREATE CERTIFICATE ZXC

ENCRYPTION BY PASSWORD = 'xiaoxiao'

WITH SUBJECT = 'DB_Encrypt_Demo Database Encryption Certificate',

START_DATE = '2015-10-1'

--jiami

Select Encryptbycert(Cert_id('ZXC'), '123456')

--jiemi

SELECT convert(Varchar(10), Decryptbycert(Cert_id('ZXC'), 0xB4E223CC08A73DE5AFE81A6FF14E76503CF55066EE8186F0781942E54B4FA97D3B49D9A16A102398311F9B259D3E2F23F0B35D3720F4AAB08357850D96A7E43494A306D227A29812BA62A33B39AC600D6585EA6B03F5F97A012C5A0BE7BC52FF60519421BD8D09311F10CC55EEA166FDBFAD2A5D9E2D3043A215AE27A918E35B,N'xiaoxiao'))

DROP CERTIFICATE ZXC

/*

4.利用mima短语方式

搭配EncryptBypassPhrase进行jiami

使用DecryptByPassPhrase函数来jiemi

比较适合一般的数据加jiemi

*/

--jiami

Select Encryptbypassphrase('xiaoma', '123456')

--jiemi

SELECT CONVERT(VARCHAR(100), Decryptbypassphrase('xiaoma',0x01000000435DFA417C8E1A1417D901357378A1864F721EAA53DCD800 ))

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