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You're reading from  CompTIA CASP+ CAS-004 Certification Guide

Product typeBook
Published inMar 2022
PublisherPackt
ISBN-139781801816779
Edition1st Edition
Concepts
Cybersecurity
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Author (1)
Mark Birch
Mark Birch
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Mark Birch

Mark Birch is an experienced courseware developer and teacher in both information systems and cyber-security. Mark has been developing content and teaching CompTIA A+ classes for more than 20 years and understands the subject area in great depth. Mark began his career working within the aerospace industry (for a major defense contractor) and has over 30 years' experience consulting, engineering, and deploying secure information systems. He has spent over 20 years working with the United States Military and United Kingdom Armed Forces, helping many students attain their learning goals. Mark has ensured that soldiers, officers, and civilians have had the best opportunities to gain cyber-security accreditation.
Read more about Mark Birch

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Understanding symmetric encryption algorithms

Symmetric encryption provides confidentiality by provisioning bulk encryption. It is highly efficient at encrypting data at rest and data in transit. Due to the relatively small key sizes that are used, it is very fast (in comparison to asymmetric encryption). Symmetric encryption uses a single key to encrypt (or lock) the data and the same key is used to decrypt (unlock) the data.

Symmetric algorithms are divided into two main categories: block and stream ciphers.

Block ciphers

These ciphers are used to encrypt data in blocks, typically 64 or 128 bits. They offer the most robust security but lack the outright speed that's offered by stream ciphers. The following are some examples of block ciphers:

  • Triple Digital Encryption Standard (3DES): 3DES replaced the original Data Encryption Standard (DES), which was designed and adopted in the 1970s. DES offered a key size of only 64 bits (56 bits for the key itself). In...
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CompTIA CASP+ CAS-004 Certification Guide
Published in: Mar 2022Publisher: PacktISBN-13: 9781801816779
© 2022 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Mark Birch

Mark Birch is an experienced courseware developer and teacher in both information systems and cyber-security. Mark has been developing content and teaching CompTIA A+ classes for more than 20 years and understands the subject area in great depth. Mark began his career working within the aerospace industry (for a major defense contractor) and has over 30 years' experience consulting, engineering, and deploying secure information systems. He has spent over 20 years working with the United States Military and United Kingdom Armed Forces, helping many students attain their learning goals. Mark has ensured that soldiers, officers, and civilians have had the best opportunities to gain cyber-security accreditation.
Read more about Mark Birch

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