Certificates and Signed Applets
The purpose of signing an applet is to allow the browser to identify the author of the applet and determine if the applet has been tampered with since it was signed.
To understand how digital signatures work, you need to understand public-key cryptography. In public-key cryptography, a unique pair of keys is used to encrypt and decrypt data. The keys are related mathematically; the data encrypted by one of the keys in the pair can be decrypted only by the other key.
Each individual, or entity (for example, a software publisher), has a unique pair of keys. The entity makes one of the keys available to the public and keeps the other key private. The public key allows anyone to encrypt data to send to the entity. ...
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