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ssh-keygen without parameters does the following,
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generates a 2048 RSA key,
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Tin-Phams-iMac:~ tinpham$ ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/Users/tinpham/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /Users/tinpham/.ssh/id_rsa. Your public key has been saved in /Users/tinpham/.ssh/id_rsa.pub. The key fingerprint is: c7:6c:3e:87:4a:09:90:ef:6d:a9:88:f8:f0:89:d2:13 tinpham@Tin-Phams-iMac.local The key's randomart image is: +--[ RSA 2048]----+ | . oo. | | s .. . | | ...++ .| | T . +.=...| | F o + *. | | + o + . | | C . | | . + | | | +-----------------+ Tin-Phams-iMac:~ tinpham$ |
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