From the course: CISSP Cert Prep (2021): 3 Security Architecture and Engineering
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Data Encryption Standard
From the course: CISSP Cert Prep (2021): 3 Security Architecture and Engineering
Data Encryption Standard
- [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 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. Up until that point different agencies use different algorithms which caused issues with both security because all of these 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. The algorithm takes 64 bits of plain text as…
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