On Nov 29, 2004, at 11:57 AM, Steve Bonham wrote:
I'd like to encrypt the password on closestack and write that to the file. Then import and decrypt the password. But I don't understand the Rev documentation for encrypt & decrypt. The following makes NO sense to me at all...
encrypt source using cipher with [password|key] passorkey[and salt saltvalue] [and IV IVvalue] [at bit ]
Can someone provide some sample Transcript that will enlighten me?
To get started, use this simplified syntax for the "password" method. (The "key" method is less suited to those new to this.)
encrypt <source> using <cipher> with [ password ] <pass_phrase> [ at <bits> bit ]
where that in brackets is optional and the <x> symbols are expressions.
This can be simplified to this:
encrypt <source> using <cipher> with <pass_phrase>
I plan to suggest a default cipher. If that idea is adopted, then the command will simplify more.
If there is an error, 'result()' returns non-empty. The encrypted value is in the variable 'it'. It will be larger than <source>.
Use "bf-cbc" to start for the cipher value. To find other ciphers to try, use cipherNames()--except on OS X for now.
A current weakness is that the default "salt" value is empty, which will make the encryption slightly weaker. This will probably be fixed soon. For most people, procedures in using encryption have greater weaknesses than this, so I wouldn't worry about it (for now). (Here is how you crack a cipher with a Cray: You call up the company and ask for the head engineer and offer him a Cray for the keys.)
The decryption is the same; replace 'encrypt' above with 'decrypt'.
Any value can be used for <source> or <pass_phrase>, but the <pass_phrase> should not be trivial.
So, an example:
encrypt "Locker 3117, Penn Station" using "bf-cbc" with "Danger, Will Robinson."
Dar
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