12-digit vs 16-digit keys

[Matrix2010]

As you know, professional BISS keys are always based on 12 digits. Using TANDBERG or similar decoders you just insert it and go! All our consumer boxes has 16-digits line, how can I add loose characters? I believe 12-digit key is "real" key, probably remaining digits are checksum or similar.... any idea? Thank you in advance.

[snakie]

yes, 4th and 8th are checksums.
You can remove them and have the 12 digit key.

[Matrix2010]

OK, I believe you say 4th and 8th position in the line. My goal is converting 12-digit key to 16-digit one; so probably I must add checksum in 4th and 8th position to make 16 characters. How can I calculate or find this checksum characters starting from real keys?

[snakie]

1+2+3=4
5+6+7=8

[Matrix2010]

Oh Snackie.... I never thought it could be so simple..... unbelievable.... many many thanks!

[Matrix2010]

Snackie... unfortunately it doesn't work. Happy for little time! I tried to make hexadecimal calculation using my scientific calculator, but I obtain 3-digit result, obviously too long for 2-digits field. In other hands, all field accepts codesw from 00 to FF, you can't insert 114 or so.... maybe this calculation is not enough. Any other information is appreciated.

[snakie]

if lets say you have A1 A2 A3 B1 B2 B3 then you split to A1 + A2 + A3 = 1E6 == A1 A2 A3 E6 ( you remove the leading digit from the sum calculation)
B1+B2+B3= 216 == B1 B2 B3 16

[Matrix2010]

Yes Snackie, and now I'm really happo! Not for a little time! It works! Fantastic! Thank you very much!

[snakie]

may i ask for what provider you test? pm me if you dont want to say here

[Ksathunter]

Hi Snakie with this BISS key what can be done? It's missing some parts.

76.67.A5.4B.7B.79


Thanks.

[moraldo]

12digits= BISS 1
16digits= BISS E

[moraldo]

new year all feed make Tandberg Director Encryption System ' new encryption like Biss
maybe all biss encrypted change to this new encryption!
if any one have idea ubout this??