President Trump’s plan to save TikTok for Americans casts Oracle Corp. as the security guard for U.S. user data and the app’s all-important algorithm.

“Oracle is playing a very big part. Oracle really understands this,” Trump said from the Oval Office this week. “So I think it’s going to be very well protected.” White House trade advisor Peter Navarro said Friday that Oracle would function as “the great firewall of America.”

But TikTok, owned by China-based ByteDance Ltd., and Oracle have spent several years and billions of dollars working together to safeguard TikTok U.S. data as part of a partnership known as “Project Texas” — an arrangement that looks strikingly similar to the one laid out by Trump this week.

Those similarities are raising concerns among security experts and China ha

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