decode - number base decoded message -

i have piece of decoded message, it's homework can't solve it, message

izwgczz2ebauwrsvojau45dsovceozks n5chkqlsm5ggsq2vnviecuseiu======

there hint saying the string encoded using unusual number base. numbers 2 - 7 represented , letters - z represented.

i have looked internet couldn't find anything, please if understand problem , solve appreciate it

let's see: a-z + 2-7 = 32 possible values.

32 values can contained in 5 bits, each byte of message represents 5 bits.

to decode, each of 5 bits have put in 1 long bit-string read 8 bit ascii string.

or, in other words: base32 encoding.

so:

izwgczz2ebauwrsvojau45dsovceozksn5chkqlsm5ggsq2vnviecuseiu======

converts to:

flag: akfurantrudgeroduarglicumparde

see here test decoding.

Ben