The one-time pad, invented by a telegraph expert in 1882, is an example of an unbreakable cipher. Using the one-time pad is fairly straightforward but it is not commonly used due to the difficulty of implementation. In this video, learn about the advantages and challenges involved in using one-time pads for security.
- Wouldn't it be nice if someone would invent…a perfect encryption algorithm that was unbreakable?…Well, someone already did.…And it was more than 100 years ago.…The one-time pad, invented by a telegraph expert in 1882,…is an example of an unbreakable cipher.…Using the one-time pad is fairly straightforward.…The sender and receiver each have a copy of identical pads…containing strings of random letters.…The pad must be as long as the total of the characters…of all of the messages that they will exchange.…
Here's an example of what one page…in the one-time pad might look like.…The sender writes the characters of the message…in plaintext on the pad.…If my message is the word secret,…I would simply write that out across the top of the pad.…The sender then adds together the characters of the message,…and the characters of the key,…treating them as numbers.…A is the first letter of the alphabet,…so think of it as the number one.…B is the number two, and so on.…If we encrypt the first letter, S, here,…we do it by adding the first letter of the key, which is A.…
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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
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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: The perfect encryption algorithm