> This study presents an investigation and comparing of all methods used in E-commerce security. Also it presents suggested methods to make e-commerce more secure. Applications of the E-commerce are demonstrated here. The efficiency of the security methods are measured and such efficiency increases as we combined more security methods with each other. A new method of security is suggested which is a combination between hash algorithm and Public Key Infrastructures (PKI). Index term-public Key Infrastructures (PKI), hash algorithm, E-commerce, security.
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