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RSA key-exchange
RSA key-exchange

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!!! Overview
The [{$pagename}] method of [Key-Exchange] consists of three messages.
%%warning
STATIC [{$pagename}] is [Deprecated] in [TLS 1.3]
%%
First the [ServerKeyExchange] where the server sends to the client an [RSA] [Public Key], K_T, to which the server holds the [Private Key]. This may be a transient key generated solely for this connection, or it may be re-used for several connections.
Second [ClientKeyExchange] where the client generates a string of random bytes, K, encrypts it using K_T, and sends the result back to the server, which decrypts it.
Then both the client and server each hash K, K_T, and the various [Key-Exchange] parameters to generate the exchange hash, H, which is used to generate the [encryption] keys for the session, and the server signs H with its host key and sends the [Digital Signature] to the client.
Then the client then verifies the host key.
!! [Authentication] with [{$pagename}]
With static [{$pagename}]s, the connection is authenticated by encrypting the [premaster Secret] with the server [certificate]’s [Public Key]. Only the server in possession of the [Private Key] can decrypt, correctly derive the [Master Secret], and send an encrypted Finished message with the right [MAC].
The simplicity of static [{$pagename}] has a serious drawback: it does not offer [Perfect Forward Secrecy]. If a [observer] adversary records all traffic to a server then every recorded [TLS] session can be broken later by obtaining the [certificate]’s [Private Key].
!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
This page (revision-1) was last changed on 29-Nov-2024 16:16 by UnknownAuthorTop