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In a public-key infrastructure (PKI), clients must have an efficient and secure way to determine whether a certificate was revoked (by an entity considered as legitimate to do so), while preserving user privacy. A few certification authorities (CAs) are currently responsible for the issuance of the large majority of TLS certificates. These certificates are considered valid only if the certificate of the issuing CA is also valid. The certificates of these important CAs are effectively too big todoi:10.1109/eurosp.2016.38 dblp:conf/eurosp/SzalachowskiCP16 fatcat:xnrnmtgaoffcxkfrq5ig5ozuyq