Encryption
So far, we have discussed one important cryptographic technique that is implemented in the Java security API, namely, authentication through digital signatures. A second important aspect of security is encryption. When information is authenticated, the information itself is plainly visible. The digital signature merely verifies that the information has not been changed. In contrast, when information is encrypted, it is not visible. It can only be decrypted with a matching key.
Authentication is sufficient for code signing—there is no need for hiding the code. However, encryption is necessary when applets or applications transfer confidential information, such as credit card numbers and other personal data.
Until recently, patents and ...
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