How does SSH protocol version 1 work?
Each host has a host-specific RSA key (1024 bits) used to identify the host. Additionally, when the daemon starts, it generates a server RSA key (768 bits). This key is normally regenerated every hour if it has been used, and is never stored on disk. Whenever a client connects the daemon responds with its public host and server keys. The client compares the RSA host key against its own database to verify that it has not changed. The client then generates a 256 bit random number. It encrypts this random number using both the host key and the server key, and sends the encrypted number to the server. Both sides then use this random number as a session key that is used to encrypt all further communications in the session. The rest of the session is encrypted using a conventional cipher, Blowfish or 3DES, with 3DES being used by default. The client selects the encryption algorithm to use from those offered by the server. Next, the server and the client enter an authentication dialog. The cl
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