The Donald Trump dossier published this week suggests that Russia has cracked a messaging app popular with Islamic State jihadists.
The dossier suggests that the encrypted messaging system, which has regularly been used by Isis fighters to communicate with each other, was of "especial [sic] concern" to Russia's FSB security service.
The note adds that the app wasn't targeted because of its popularity among terrorists, but because it was regularly used by Russian dissidents opposed to President Vladimir Putin.
It is also claimed that "the FSB has cracked this communications software and therefore it was no longer secure to use."
The claims about Telegram have largely been overlooked in the media's coverage of the dossier, which was published in full by news website Buzzfeed on Tuesday and contains a number of unverified claims about President-elect Trump.
The dossier, reportedly commissioned by a Washington firm on behalf of Mr Trump's political opponents, suggests Russia has been cultivating information on the incoming president for at least five years and suggests the Kremlin has information about Mr Trump's alleged use of prostitutes during a visit to Moscow, which could be used to blackmail him.
Mr Trump denies the allegations contained in the dossier, saying they are nothing more than "fake news."