A Symmetric Key Encryption Using Digital Envelopes Digital
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Transcript A Symmetric Key Encryption Using Digital Envelopes Digital
A Symmetric Key Encryption Using Digital
Envelopes
Digital envelopes created to transmit the symmetric key
Digital envelope:
Problem:
a technique that uses symmetric encryption for large documents, but
public key encryption to encrypt and send the symmetric key.
Public key encryption
Computationally slow, decreased transmission speed, increased processing time
Symmetric key encryption
Insecure transmission lines
Solution:
Uses symmetric key encryption to encrypt document
Uses public key encryption to encrypt and send symmetric
key
Copyright © 2010 Pearson Education, Inc.
Slide 5-1
Creating a Digital Envelope
(key with in key )
•Diplomatic document (message) is Encrypted using a symmetric
Key (which is required by the Receiver to decrypt the document.)
.
•Now symmetric key is encrypted with receiver public key
•The encrypted report and the digital envelope are
sent across the web (internet).
• The receiver first uses his/ her private key to
decrypt the symmetric key , then receiver uses the
Symmetric key to decrypt the report.
Figure 5.10, Page 293
Copyright © 2010 Pearson Education, Inc.
Slide 5-2