06-20-2019
You need to generate ssh key pairs which are longer in length.
Modern computers can "break" the crypto based on brute force (millions of attempts of various keys, for example.)
The longer the length of the key, the larger the key domain and hence the stronger the crypto.
You are being advised to generate new keys which are stronger cryptographically because the key lengths will be longer.
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LEARN ABOUT DEBIAN
rskeygen
rskeygen(1) General Commands Manual rskeygen(1)
NAME
rskeygen - generate private key pairs for TI graphing calculators
SYNOPSIS
rskeygen [ --secure ] [ --ti ] [ --length nbytes ]
DESCRIPTION
rskeygen generates application and OS signing keys for the Texas Instruments TI-73, TI-83 Plus, TI-84 Plus, TI-89, and TI-92 Plus graphing
calculators. These keys consist of two prime numbers p and q as well as their product n. Current calculator models impose a limit of 512
bits (64 bytes) on the size of n, so p and q are generally about 256 bits each. As of this writing this means factoring n is beyond the
reach of most people, though this will undoubtedly change in the future.
The keys generated by rskeygen are not very useful at the moment, because in order for an application or OS to be accepted by the calcula-
tor, the key used to sign it must itself be signed using the calculator's own (possibly unique) private key, which is only known to TI.
Nevertheless, rskeygen is provided in the hope that it can be useful, both for testing and for devising new signature schemes based on
TI's.
OPTIONS
--secure
Attempt to generate a ``secure'' key using the system's entropy pool, /dev/random (see random(4).) The actual security is thus
dependent on your system's implementation of /dev/random.
Without --secure, the keys are generated based on the current time and process ID, which is not secure in the slightest.
--ti Generate keys which are palatable to TI's official app signing programs. This forces p to be congruent to 3 and q to 7 modulo 8.
This option is not necessary when using rabbitsign(1), nor is it necessary for the calculator to validate signatures properly.
--length nbytes
Specify the length in bytes of the modulus n; p and q are each calculated to be approximately half this length. This should not be
greater than 64 for current calculators, and must be less than 256 in any event due to a limitation of the key file format.
SEE ALSO
rabbitsign(1), packxxk(1)
AUTHOR
Benjamin Moody <floppusmaximus@users.sf.net>
RabbitSign 2.0 July 2009 rskeygen(1)