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Full Discussion: SSH - Public key
Top Forums UNIX for Advanced & Expert Users SSH - Public key Post 302118404 by encrypted on Tuesday 22nd of May 2007 12:09:05 AM
Old 05-22-2007
I assume you are asking the question:
"Why should one have to generate a public key on a Server when the public key is already created and used by other clients?"

The reason behind is that the set of public-private keys are unique for each host and in order that the "server" communicates to the "client" on ssh we need to generate this unique public key which when copied onto the "clients"
would able to authenticate the "server".

enc.
 

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OPENSSL_PUBLIC_ENCRYPT(3)						 1						 OPENSSL_PUBLIC_ENCRYPT(3)

openssl_public_encrypt - Encrypts data with public key

SYNOPSIS
bool openssl_public_encrypt (string $data, string &$crypted, mixed $key, [int $padding = OPENSSL_PKCS1_PADDING]) DESCRIPTION
openssl_public_encrypt(3) encrypts $data with public $key and stores the result into $crypted. Encrypted data can be decrypted via openssl_private_decrypt(3). This function can be used e.g. to encrypt message which can be then read only by owner of the private key. It can be also used to store secure data in database. PARAMETERS
o $data - o $crypted - This will hold the result of the encryption. o $key - The public key. o $padding -$padding can be one of OPENSSL_PKCS1_PADDING, OPENSSL_SSLV23_PADDING, OPENSSL_PKCS1_OAEP_PADDING, OPENSSL_NO_PADDING. RETURN VALUES
Returns TRUE on success or FALSE on failure. SEE ALSO
openssl_private_encrypt(3), openssl_private_decrypt(3). PHP Documentation Group OPENSSL_PUBLIC_ENCRYPT(3)
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