That 9 is useless except to guide you to the first step

Strange that there is only one number in the whole string but since there are 81 characters it can be divided in groups of 9 hence the hint.

rfdurtipn

sfcvstjoo

sfdussioo

sfcursipo

rfcursjpn

securtjoo

sfcustioo

redvrsipo

rfdvrtio9

If you look at the individual columns you can see that they are formed by only two letters: r/s, e/f, c/d, u/v, r/s, s/t, i/j & n/o

The only 9 letter keyword that would fit using 1 letter from each column is RECURSION. From these groups, interpret no change to orignal letters as 0 and change as 1

recursion
rfdurtipn			011001010
sfcvstjoo			110111101
sfdussioo			111010001
sfcursipo			110000011
rfcursjpn			010000110
securtjoo			100001101
sfcustioo			110011001
redvrsipo			001100011
rfdvrtio9			011101001

We now have 81 binary bit. You can remove the last bit since 9 was used as a hint. This will give 80 bits, group them in 8s

01100101 01101111 01111010 00111000 00110100 00110100 00110111 00110010 01100011 01110100

Convert Binary to Ascii

eoz84472ct

Insert the keyword recursion

eoz84recursion472ct

Use a skip of 2

gdbijetodibnimdbiegetodhebmcfoureightfiveseveniiibtp

Split in two groups of 26

gdbijetodibnimdbiegetodheb
mcfoureightfiveseveniiibtp

With the second string, change numbers to numeral form

mc48573btp

Reverse to get prefix and suffix

ptb37584cm

The first string must contain the information to the keyword but I was not able to make sense of it. Played with reversing some groups of letters, found the word bed, hot, mind but did not find the complete solve. I bruted the keyword fear to give the valid passcode

ptb37fear584cm