How to solve the type of this simple diophantine equation with large Integers

Laël Cellier <[email protected]>
Newsgroups gmane.comp.mathematics.pari.user
Message-ID <[email protected]>
Bonjour,simple question. I ve B and a semiprime A which are very large unrelated fixed integers impossible to factor.How to find y and z such as y²≡z²×B mod A? Which pari functions to use? Nfroots? Cordialement,
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