ssh-keygen.c contains condition
else if (type != KEY_ECDSA && type != KEY_ED25519 && *bitsp < 768)
fatal("Key must at least be 768 bits");
Please increase the minimal RSA key length.
https://eprint.iacr.org/2010/006
This paper reports on the factorization of the 768-bit number RSA-768 by
the number field sieve factoring method
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