Types of SQL Injection

SQL injection is a security vulnerability that occurs in the database layer of an application. The vulnerability is present when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and thereby unexpectedly executed. It is in fact an instance of a more general class of vulnerabilities that can occur whenever one programming or scripting language is embedded inside another.

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The SHA (Secure Hash Algorithm) family is a set of related cryptographic hash functions. The most commonly used function in the family, SHA-1, is employed in a large variety of popular security applications and protocols, including TLS, SSL, PGP, SSH, S/MIME, and IPSec. SHA-1 was considered to be the successor to MD5, an earlier, widely-used hash function. Both are reportedly compromised. In some circles, it is suggested that SHA-256 or greater be used for critical technology. The SHA algorithms were designed by the National Security Agency (NSA) and published as a US government standard.

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