From the course: CompTIA CySA+ (CS0-002) Cert Prep: 4 Software and Systems Security
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Key exchange
From the course: CompTIA CySA+ (CS0-002) Cert Prep: 4 Software and Systems Security
Key exchange
- [Instructor] As we've already discussed, every encryption algorithm relies upon the use of encryption and decryption keys, and it's critical to keep some of those keys secret. In the case of symmetric encryption, the sender and receiver share a single secret key that nobody else should know. Before the sender and receiver can begin to communicate using a symmetric algorithm, they must somehow agree upon and exchange the shared secret key that they will use for that communication session. If you stop and think about it for a moment, this can be a real challenge. Let's say that Alice and Bob would like the ability to communicate secretly with each other. They hope to achieve two of the goals of cryptography, confidentiality for their communications, and an assurance of authentication that they are really talking to each other. How can they exchange an encryption key? Well, Alice might go ahead and randomly select a…
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Understanding encryption4m 15s
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Symmetric and asymmetric cryptography4m 34s
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Goals of cryptography2m 26s
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Choosing encryption algorithms2m 41s
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Key exchange3m 2s
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Diffie-Hellman5m 16s
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Trust models3m 7s
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PKI and digital certificates4m 20s
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Hash functions7m 30s
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Digital signatures4m 4s
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Creating a digital certificate4m 37s
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Revoking a digital certificate1m 46s
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