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Vb net validating input

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Otherwise, you are allowing attackers to repeatedly attack your application until they find a vulnerability that you haven't protected against.Detecting attempts to find these weaknesses is a critical protection mechanism.There are four strategies for validating data, and they should be used in this order: This strategy is also known as "whitelist" or "positive" validation.The idea is that you should check that the data is one of a set of tightly constrained known good values. Data should be: This strategy, also known as "negative" or "blacklist" validation is a weak alternative to positive validation.Say you want to set up a site where users can upload arbitrary files so they can share them or download them again from another location.In this case validation is impossible because there is no valid or invalid content.If you want text from a user comment form, it is difficult to decide on a legitimate set of characters because nearly every character has a legitimate use.

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An attacker can change the HTML in any way they choose: rather than account names.

For example, if you use HTML entity encoding on user input before it is sent to a browser, it will prevent most XSS attacks.

However, simply preventing attacks is not enough - you must perform Intrusion Detection in your applications.

Integrity checks must be included wherever data passes from a trusted to a less trusted boundary, such as from the application to the user's browser in a hidden field, or to a third party payment gateway, such as a transaction ID used internally upon return.

The type of integrity control (checksum, HMAC, encryption, digital signature) should be directly related to the risk of the data transiting the trust boundary. However, validation should be performed as per the function of the server executing the code.