Researchers at John Hopkins University have discovered a way to breach iMessages in transit between Apple products, according to a report on Monday. The messages are supposed to be protected by end-to-end encryption.

“Even Apple, with all their skills — and they have terrific cryptographers — wasn’t able to quite get this right,” professor Matthew Green, whose team of graduate students discovered the flaw, said in a Washington Post report. “So it scares me that we’re having this conversation about adding back doors to encryption when we can’t even get basic encryption right.”