Unexportable crypto
A simple substitution cypher has a keyspace of 26! ~ 2**88 Isn't this too strong to export?
-----BEGIN PGP SIGNED MESSAGE----- "ET" <emergent@eval-apply.com> writes:
A simple substitution cypher has a keyspace of 26! ~ 2**88 Isn't this too strong to export?
No. ITAR restricts key *size*, not keyspace. A substitution cypher has a key size of 2**4 <= 26 <= 2**5, you're not going to get the Feds pissed off at you about it. - -- Graham Hughes http://A-abe.resnet.ucsb.edu/~graham/ MIME & PGP mail OK. (define PGP_fingerprint "E9 B7 5F A0 F8 88 9E 1E 7C 62 D9 88 E1 03 29 5B") (require 'stddisclaim) -----BEGIN PGP SIGNATURE----- Version: 2.6.3 Charset: noconv Comment: Processed by Mailcrypt 3.4, an Emacs/PGP interface iQCVAwUBM3dP2SqNPSINiVE5AQG/6wQAogjCV/ypxcxZXLAMG+QD5amtcKdyteVj pxRpWDcaB6C8q0Gi6woxn/OABl09oKwgCSX1dVhh8W2cvfnKzeuPmkQ/AUC8bUXO /ymWvPiNJ5bFkxfOiUw172/6FvpnO6DWm//Jb1rEZhSP5IY3AJO2+P+GE+DQ/1+g j62owOWHZBk= =Brxy -----END PGP SIGNATURE-----
-----BEGIN PGP SIGNED MESSAGE----- In article <199705121618.MAA09197@jazz.cape.com>, ET <emergent@eval-apply.com> wrote:
A simple substitution cypher has a keyspace of 26! ~ 2**88 Isn't this too strong to export?
Actually, yes. The cypherpunks ftp site has a program on it that helps you break simple substitution ciphers (like newspaper cryptograms), for which the author claims he was denied an export license. - Ian -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBM3f6/UZRiTErSPb1AQGcyAQAqb2FX4Cn1aJfLTry8ZyaG6vVinaxLedM nOK/uBGXEeuFCR0S+nwOmy2hvB3MpZM0BJrQCxqOQSqXjufbPsdfi9lu7T8vJ6vP RUhxIuleN5hv2CHUs3B4+i0WpfxegspTp4txaeJO0DAY3dowqJI8apN9YECPny0r NlX9YA1fObE= =wrek -----END PGP SIGNATURE-----
participants (3)
-
ET -
Graham C. Hughes -
iang＠cs.berkeley.edu