Understanding TLS and its cipher suite - Part 1



Key exchange algorithms protect information required to create shared keys. These algorithms are asymmetric (public key algorithms) and perform well for relatively small amounts of data.
Bulk encryption algorithms encrypt messages exchanged between clients and servers. These algorithms are symmetric and perform well for large amounts of data.
Message authentication algorithms generate message hashes and signatures that ensure the integrity of a message. Other scheme used here includes HMAC.










MAC - Common message authentication scheme are HMAC,  OMAC, CBC-MAC and PMAC. Newer and better ones would be AES-GCM and ChaCha2, Poly1305

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The specified initialization vector (IV) does not match the block size for this algorithm

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If you're getting  exception when trying to assigned key to a symmetric key and getting error message below :- The specified initialization vector (IV) does not match the block size for this algorithm And your code probably look like something below :- Then you need to go into debug mode and start looking into the supported size for IV as shown in diagram below :- As you can see, IV is 16 bytes, so you need to provide 16 bytes. The same goes for Key field too, if you're adding anything to it. As long as you provide a valid key size, then we're good and you're code will be ready.
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