Cryptography is the most effective way to achieve data security & is essential to e-commerce activities such as online shopping stock trading & banking. This invaluable introduction to the basics of encryption covers everything from the terminology used in the field to specific technologies to the pros & cons of different implementations. It discusses specific technologies that incorporate cryptography in their design such as authentication methods wireless encryption e-commerce & smart cards. It is based entirely on real-world issues & situations the material provides instructions for already available technologies that readers can put to work immediately. Expert author Chey Cobb is retired from the NRO where she held a Top Secret security clearance instructed employees of the CIA & NSA on computer security & helped develop the computer security policies used by all U.S. intelligence agencies.