The Data Encryption Standard (DES) is a historic encryption algorithm designed and implemented by IBM in the 1970s with the purpose of serving as a standard encryption algorithm for unclassified communication throughout the federal government. In this video, learn how DES implements encryption and decryption, as well as the flaws in this approach.
- [Instructor] Modern symmetric algorithms…are much more complex than the simple substitution…and transposition ciphers of years past.…One of the most well-known symmetric algorithms…is the Data Encryption Standard, or DES.…DES is an historic encryption algorithm…designed and implemented by IBM in the 1970s…with the purpose of serving…as a standard encryption algorithm…for unclassified communication…throughout the federal government.…
Up until that point,…different agencies used different encryption algorithms.…This caused issues with both security…because all of those algorithms weren't thoroughly tested…and interoperability because different agencies couldn't…easily communicate with each other in a secure manner.…Let's dig into how DES works…because it serves as a great example…of the complexity of modern cryptographic algorithms.…This picture shows the basic functioning of DES.…
It takes 64 bits of plain text as input in the top…and then runs it through an encryption operation…known as the Feistel function.…
Author
Mike Chapple
Updated
8/28/2020Released
3/8/2018Find the companion study books at the Sybex test prep site and review the complete CISSP Body of Knowledge at https://www.isc2.org/cissp-domains/default.aspx. You can also join Mike's free study group at certmike.com.
- Understanding security design principles and models
- Cloud computing and virtualization
- Hardware security
- Client and server vulnerabilities
- Web security vulnerabilities
- Securing mobile devices and smart devices
- Understanding encryption
- Symmetric and asymmetric cryptography
- Key management and public key infrastructure
- Physical security
Skill Level Advanced
Duration
Views
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Introduction
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Your security architecture2m 38s
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1. Security Engineering
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Secure design principles5m 18s
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Security models4m 14s
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Security requirements3m 25s
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2. Cloud Computing and Virtualization
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Virtualization4m 20s
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Cloud computing models3m 44s
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Public cloud tiers5m 35s
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3. Hardware Security
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Memory protection3m 20s
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Interface protection4m 10s
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4. Client and Server Vulnerabilities
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Client security issues6m 16s
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Server security issues4m 25s
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NoSQL databases6m 53s
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5. Web Security
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OWASP top ten4m 52s
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SQL Injection prevention5m 20s
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Fuzz testing6m 44s
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Session hijacking3m 50s
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6. Mobile Security
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Mobile device security2m 35s
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Mobile device management6m 14s
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Mobile device tracking3m 14s
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Mobile application security4m 23s
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Bring your own device (BYOD)4m 47s
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7. Smart Device Security
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Industrial control systems4m 36s
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Smart home technology3m 6s
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8. Encryption
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Understanding encryption3m 24s
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Goals of cryptography2m 49s
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Codes and ciphers3m 20s
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The cryptographic life cycle2m 49s
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Digital rights management2m 17s
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9. Symmetric Cryptography
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3DES3m 35s
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AES, Blowfish, and Twofish6m 40s
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RC42m 23s
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Steganography4m 55s
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10. Asymmetric Cryptography
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Rivest-Shamir-Adleman (RSA)3m 26s
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PGP and GnuPG11m 9s
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11. Key Management
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Key exchange3m 4s
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Diffie-Hellman5m 12s
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Key escrow3m 13s
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Key stretching1m 55s
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12. Public Key Infrastructure
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Trust models3m 1s
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PKI and digital certificates4m 28s
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Hash functions9m 11s
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Digital signatures4m 4s
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Create a digital certificate4m 33s
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Revoke a digital certificate1m 48s
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13. Cryptanalytic Attacks
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Brute-force attacks3m 12s
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Knowledge-based attacks2m 10s
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14. Physical Security
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Site and facility design3m 7s
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Physical access control3m 58s
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Visitor management1m 35s
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Conclusion
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Next steps41s
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Video: Data Encryption Standard (DES)