Data security measures aim to prevent the stealing of information; the techniques employed have become highly developed in recent years. To use these techniques effectively requires new knowledge and analytic skill. The defender must outwit the attacker in ingenuity and imagination. This book describes the basic techniques and suggests how to apply them. Awareness of the risk has been greatest in the financial world, so the specialized services and networks of this sector have pioneered the practical use of encipherment and authentication. This book gives special attention to EFT (electronic funds transfer) as an example of security in action.
A new phase of technical development began in 1976 with the introduction of public key cryptosystems and digital signature; these are covered in detail. Some new ideas are presented for their introduction in EFT in conjunction with other recent technical advances. Thus the book ranges over a wide scope from classical cryptography to the latest methods of digital signature.
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