Digital Signature Algorithm (DSA) - Cryptography - Practical TLS

The Digital Signature Algorithm (DSA) is an Asymmetric Encryption algorithm... but it's different from the other Asymmetric Encryption algorithms we've discussed (RSA & DH). DSA has only two functions: Signature Generation and Signature Verification. It cannot do Encryption, it cannot do Decryption, it cannot do a Key Exchange. It's use is purely creating and verifying Signatures, which provides Integrity and Authentication to what is signed.
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[@PracticalNetworking]

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[@VideosfromElle]

I'll be signing up for the class Friday 😀 I have watched so many of your videos, it's the least I can do lol Absolutely confident it's worth every penny!

[@lizgm1723]

Visuals were a perfect complement to explanation. Thank you.

[@tarikibouzidene6399]

So clear, you are the best trainer ever I follow.

[@PracticalNetworking]

Thank you for the kind words, Tarik. Cheers.

[@askaripayalo8191]

Thank you for sharing knowledge.

[@rotorfpv4117]

Very informative, thanks

[@IliyaDamyanov]

Very good explanation.

[@nournote]

Perfectly summarized

[@lherfel]

thanks, very nice overview

[@citizenoftheworldsz9]

simply excellent!

[@PracticalNetworking]

Thank you =)

[@krishnamohanyerrabilli4040]

Clearly understood thankyou.

[@PracticalNetworking]

you're welcome, Krishnamohan

[@Don-Carillo]

Thanks very much,. it would be good to explain how a certificate in a chain uses the public key of the cert above it in the chain to verify it. I am probably not explaining very well but how it uses it to decyrpyt the signature that has been signed by the CA private key. Hope that makes some sense :)

[@PracticalNetworking]

Hey Don. All that is unpacked in the full TLS course. It's on sale now if you want instant access.

[@upelister]

Thank you.

[@PracticalNetworking]

You're welcome, Umut =)

[@arunsankpal4219]

Thank you sir 🙏 🇮🇳

[@PracticalNetworking]

You're welcome!

[@ayradizem2770]

Thank you for the video, we need an exemple where to use this algorithms with practucal, also I will begin to learn how to use GNS3 for to practise my knowledge in network,, can I practise this video in GNS3?? thank you in advance

[@PracticalNetworking]

The end user rarely uses the algorithms themselves. But they use software which then make use of the example. For instance, you use a web browser, which makes HTTPS connections... your webbrowser uses the algorithms in the process of creating the HTTPS/SSL connection.

[@ayradizem2770]

@@PracticalNetworking thank you for your explain

[@pickle1987]

Hello, can you please do a video about the ed25519 vs rsa? I've heard ed25519 is more secure and fast

[@PracticalNetworking]

I have plans to one day cover elliptic curves entirely.

[@Cutrexxx]

can ecdsa also only sinature a massege?

[@PracticalNetworking]

Yes. ECDSA is like DSA in so far as what it can be used for. In fact, all the "EC" variants are simply the same core protocols done with Elliptic Curves. More details here: www.practicalnetworking.net/practical-tls/rsa-diffie-hellman-dsa-asymmetric-cryptography-explained/

[@rafay1708]

Thanks

[@PracticalNetworking]

You're welcome!

[@admin_e]

👍👍👍

[@dan5640]

why is it called asymmetric encryption if it doesn't actually encrypt?

[@PracticalNetworking]

Great question =). You're right, Asymmetric Encryption is _not_ the best terminology. I wrote about that here: www.practicalnetworking.net/practical-tls/rsa-diffie-hellman-dsa-asymmetric-cryptography-explained/ _"some might even hesitate to use the term “Asymmetric Encryption” for these algorithms, and instead elect to use “Asymmetric Cryptosystem” - since again, only one of these algorithms involves actual “encryption”._

[@thestudy6875]

Came to the comments to see if anyone else was scratching their head on this one too!

[@fugoogle_was_already_taken]

It is asymetric cryptography/cryptosystem, not encryption. There are cryptographic capabilities. Some of them are key exchange (like diffie helman), encryption (like rsa) and authentication (like digital signatures, rsa). There are many cryptographic protocols/schemes, but not all of them provide all the cryptographic capabilities. For example, you cannot use diffie helman for encryption. Because its just not possible. You can use it for key exchange, and then use symetric cryptography for encryption, but you cannot encrypt anything with diffie helman.

[@Liltheo626]

Okay

[@user-mf8nn3tl5w]

I saw its math somewhere else I hoped you'd get into the math part 🥲