Could you create a version of Base91 that exactly map to 13bits?

Question

Could you create a version of Base91 that exactly map to 13bits?

DonaldTsang opened this issue 9 years ago · comments

Don Tsang commented 9 years ago

I would like to have a B91 system where each 52bits maps to exactly 4 characters. Is it possible to do that?

Adrien Béraud · Answer 1 · Wed Oct 21 2015 23:07:42 GMT+0800 (China Standard Time)

That's very close to what base91 does.
What would you do if the message length is not a multiple of 4 bytes ?

Don Tsang · Answer 2 · Thu Oct 22 2015 12:28:50 GMT+0800 (China Standard Time)

I though Base91 will sometimes put 14bits into 2 characters due to "higher compression", and i wanted a version of base91 that WILL NOT switch between 13bit and 14bit blocks.

P.S. 2^13 in base91 is 90:2, that means everything from C" (90:2) to "" (90:90) should be invalid pairs.

Don Tsang · Answer 3 · Mon Oct 26 2015 16:16:35 GMT+0800 (China Standard Time)

r-lyeh-archived/base#1 Found someone who i asked a similar question.