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What is the main reason that PGP compress files?
When a user encrypts plaintext with PGP, PGP first compresses the plaintext. Data compression saves modem transmission time and disk space and, more importantly, strengthens cryptographic security.
What is compression in PGP?
Compression is basically converting a message of n bits to m bits (n > m) using a compression algorithm. In PGP, message is compressed only after the application of Signature. The compressed data is decompressed at the receiver’s end to obtain the original message and the signature.
How is the compression service provided in PGP?
Compression service in PGP is provided using ZIP Algorithm. The Compression is included in combined Authentication & Confidentiality of PGP as follows : In PGP, message is compressed only after the application of Signature. The compressed data is decompressed at the receiver’s end to obtain the original message and the signature.
How is the session key encrypted in PGP?
The session key is encrypted with RSA (or another algorithm known as ElGa-mal) using the recipients public key and is prepended to the message. Figure 12.2:PGP cryptographic functions. The receiver uses RSA with its private key to decrypt and recover the sessionkey. The session key is used to decrypt the message.
What are the services and features of PGP?
PGP consists of the following five services: 1. Authentication 2. Confidentiality 3. Compression 4. E-mail compatibility 5. Segmentation Table 12.1 shows a summary of these services and the algorithms used to implement them.
How is compression used in the email industry?
Compression is basically converting a message of n bits to m bits (n > m) using a compression algorithm. Compression helps the email service providers to increase their productivity as the storage overhead, processing and labor spent on the maintenance of their servers is reduced.