Writing in another script (Navajo, Chinese or Arabic or ...) would make sense if the sole goal was to keep things secret. But then, you need also to learn it first. And if Kodhy was command crew, with the use of available NEATs, he could then self learn a completly artificial one too.
Writing in Spanish like here, effectively keep things hidden form Safeholdians but not command crew. And translation will be hard, without the usual cultural clues.
An interesting twist is that he started to write in Spanish at the end of his notes, and wrote more and more in it. If it was mother tongue language, that may bemelancoly, desillusion, saudad whatever at times that are tough. In that case, the fact it keeps secrets is incidental.
evilauthor wrote:You know, given that English is the only language that was supposed to be on Safehold, the mere fact that Kohdy wrote Spanish in his diaries would have rung alarm bells if any "Angel" learned of it. Never mind what he was writing about, just using Spanish would be a "forbidden knowledge" violation.
But of course, Spanish would only be recognizable as forbidden knowledge to someone who already knew about Spanish. To anyone else, Spanish would just look like particularly exotic code. Suspicious perhaps, but not automatically labeled as "forbidden".
Which is basically another example of how trying to forbid knowledge without actually telling what knowledge is actually forbidden is doomed to failure.
Edit: Also, I'm going to have to go with Spanish not being a dead language when the Federation fell and that Kohdy personally knew it. After all, why encode a journal in Spanish? Why not something more obscure or alien to English? Like Russian, or Chinese, or even Navajo?