Adding Authorized Keys
Here is the process to generate a 2048 bit RSA key and add the same to the SFTP server. This is done with the help of WinSCP tool on Windows. However, the same can be done using ssh-keygen on Linux as well.
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Launch WinSCP and select Tools -> Run PuttyGen.
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Select "SSH-2 RSA" for the type of key to generate and enter "2048" for the number of bits in a generated key field. Click Generate.
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Move the mouse over the blank space in the window until the key is generated.
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Once the key is generated, click the Save public key button to save the public key to a file.
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Click the Save private key button to save the Private key to a file. Confirm to save it with/without a passphrase.
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Open an SR with Oracle Support, to associate the Public half of the Key with your SFTP account (attach the Key with the SR).