What are the five principles services provided by PGP?

What are the five principle services provided by PGP? (The text only lists four services): “The actual operation of PGP consists of four services: authentication, confidentiality, compression, and e-mail compatibility.”

Subsequently, one may also ask, what are the services provided by PGP?

Pretty Good Privacy (PGP) is an encryption program that provides cryptographic privacy and authentication for data communication. PGP is used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications.

One may also ask, why does PGP generate a signature before applying compression? The signature is generated before compression for two reasons: (a) It is preferable to sign an uncompressed message so it is free of the need for a compression algorithm for later verification. Message encryption is applied after compression to strengthen cryptographic security.

Likewise, what are the keys used by PGP?

PGP uses a combination of secret key encryption and public key encryption to provide privacy. Therefore, we can say that the digital signature uses one hash function, one secret key, and two private-public key pairs.

How does PGP provide confidentiality?

PGP achieves confidentiality and authentication by the following steps:

  1. The sender creates a message M.
  2. SHA-1 is used to generate a 160-bit hash code of the message.
  3. The hash code is then encrypted with RSA using sender’s private key.
  4. The result is concatenated with the original message.

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