![]() The message is again passed to hash function and it’s hash value is calculated and obtained.īoth the values, one from signature and another from the recent output of hash function are compared and if both are same, it means that the email is actually sent from a known one and is legit, else it means that it’s not a legit one. The signature is then decrypted using the sender’s public key(PU a) and the hash value is obtained. Then the message is compressed to reduce the transmission overhead and is sent over to the receiver.Īt the receiver’s end, the data is decompressed and the message, signature are obtained. All the process happened till now, is sometimes described as signing the message. The Message is then appended to the signature. Then, using the sender’s private key (KP a), it is encrypted and it’s called as Digital Signature. For the hashing purpose, SHA-1 is used and it produces a 160 bit output hash value. The application is based on a few commands which are very easy to use.Īs shown in the above figure, the Hash Function (H) calculates the Hash Value of the message. PGP software is an open source one and is not dependent on either the OS (Operating System) or the processor. He designed it in such a way, that the best cryptographic algorithms such as RSA, Diffie-Hellman key exchange, DSS are used for the public-key encryption (or) asymmetric encryption CAST-128, 3DES, IDEA are used for symmetric encryption and SHA-1 is used for hashing purposes. It was designed by Phil Zimmermann way back in 1991. ![]() One was S/MIME which we will see later and the other was PGP.Īs said, PGP (Pretty Good Privacy), is a popular program that is used to provide confidentiality and authentication services for electronic mail and file storage. Interestingly, among the various plug-ins and extensions that people started to use, there were two main programs that were solely responsible for the complete email security that the people needed. Among the services people opted for, most particularly for Emails, were different plug-ins and extensions for their browsers. In 2013, when the NSA (United States National Security Agency) scandal was leaked to the public, people started to opt for the services which can provide them a strong privacy for their data. Software Engineering Interview Questions.Top 10 System Design Interview Questions and Answers.Top 20 Puzzles Commonly Asked During SDE Interviews.Commonly Asked Data Structure Interview Questions.Top 10 algorithms in Interview Questions.Top 20 Dynamic Programming Interview Questions.Top 20 Hashing Technique based Interview Questions.Top 50 Dynamic Programming (DP) Problems.Top 20 Greedy Algorithms Interview Questions.Top 100 DSA Interview Questions Topic-wise.
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