How many symmetric keys are needed

Search for free courses, interactives, videos and more! Free learning from The Open University. Featured content. Free courses. All content. Course content. About this free course 25 hours study. Level 3: Advanced. Course rewards. Free statement of participation on completion of these courses. Create your free OpenLearn profile. Course content Course content. Network security Start this free course now.

Each member would need 1 public key and 1 private key. Symmetric Encryption vs Public Key Encryption. How many keys would Symmetric Encryption require to protect group N? If group N had 50 members, it would need to generate and maintain Symmetric Keys. How many keys would Public-key Encryption require to protect group N? Turner, Guillaume Forget, James H. Get in touch to better understand how our solutions secure ecommerce and billions of transactions worldwide.

Turner guests on January What is Symmetric Encryption? There are two types of symmetric encryption algorithms: Block algorithms. RC4 is stream cipher. What is Symmetric Encryption Used For? Some examples of where symmetric cryptography is used are: Payment applications, such as card transactions where PII needs to be protected to prevent identity theft or fraudulent charges Validations to confirm that the sender of a message is who he claims to be Random number generation or hashing Key management for symmetric encryption - what we need to consider Unfortunately, symmetric encryption does come with its own drawbacks.

Attribution data Unlike asymmetric public-key Certificates , symmetric keys do not have embedded metadata to record information such as expiry date or an Access Control List to indicate the use the key may be put to - to Encrypt but not Decrypt for example. Key Management at large scale Where only a few keys are involved in a scheme tens to low hundreds , the management overhead is modest and can be handled through manual, human activity.

Conclusion Maintaining large-scale symmetric encryption systems is a very challenging task. Turner guests. More Stories. For the asymmetric keys, each one would have 2 keys, so a total of keys. Improve this answer. Add a comment. Dasun Haren Dasun Haren 21 2 2 bronze badges.

Would you please mind and edit your answer a bit? The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile.