-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Aloha!
Fredrik Thulin wrote: > My point is that we will have to deal with warmup/bootup tests > regardless of if we do 1 or N bootups of the entropy source for every > 1 bootup of the HSM. No, N bootups will be much, much more complicated. Warmup once during cold boot of the board is one thing. A lot of things will take time, initiialize etc. Doing warmup delay, testing multiple times while the board is quite probably running in operations mode open up for starvation in SW, possible timeouts etc. If the entropy source power control and thus warmup is under FPGA control we can do this only during full reseed. But unless the reseed gets a headsup, we either power up when it in fact wasn't needed, or we risk adding the warmup delay right into the reseed time. One point of having the TRNG chain structured with separated mixer and FIFOs is that we can do reseed while delivering random data to applications. This will risk breaking that assumption. As I said. I can live with having the power down function on the board, but possible to disable (i.e. it will be from the start.). But I think it opens up a huge can of worms and will require quite a lot of thinking and FPGA design to eliminate possible problems. - -- Med vänlig hälsning, Yours Joachim Strömbergson - Alltid i harmonisk svängning. ======================================================================== Joachim Strömbergson Secworks AB joac...@secworks.se ======================================================================== -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBCAAGBQJWqL6mAAoJEF3cfFQkIuyNH9gQAIg54JkJ/DuFivAAS5pqfTQm RcYbfKXXS5QnN5NIRXT/pan70mAf2HrcTNB3fkos+glVqQbj4Yi7zo3CDzx4hZAK m6Qi0tWraOrHiKIQhlkE9/HRsanoF5RW0ryECqhGdePsj7f1ObLgWU7arAe/s/Lm tfDpzn0p/Q/D2RDo1GyogxOO694WiOhPlYXov8FMrsm9NjSSQkEg9xjbvBTBByeZ sGM6jhe6n0zNZnbCHVJumg19IO1WqEURyoA46JCsZYlcDqr1iHO34R9e6Q3fYjGl LRSPoTTyfagYovacbHaUHPK6c4/6HoCnd6a+U3/e/jlFnVmCyUDm52AkPJ7CKtyV drPWN7RTfbs3OQV0xN+0vxfQviTg/Z/splVXxPGa3yy2k5hXSkx7qeSUkGwPaD3Y HLz9XqrBCRQuhYuDrRQFte/P+UExhrR/Qi8DZqvrqLdFsuAAgtZp+Lw7LSRoMgXX Br53KTwVtcVJBppn1ddmsCrWFZ/kcdfXy5hhFcxtpLBZFGTkOVvq7S6eYbiBDH/z dQoFgmUxaY9jec8RikgP3gFYKp+8Rji3HuDa6xZKBLRcd93/tvm8Ru4IZoIhNT4X XDVySVgP+OxTWa8ZLmxCX589aDg+QQ25MD5tsq9kvM5kE6jrlowgdl7sO3syRWn2 af1s1/l9lQDY8i6Vqhcf =FScq -----END PGP SIGNATURE----- _______________________________________________ Tech mailing list Tech@cryptech.is https://lists.cryptech.is/listinfo/tech
