Most of the existing ciphertext-policy attribute-based encryption (CP-ABE) schemes that support outsourced decryption do not consider the privacy protection of the ciphertext access policy. while some schemes that support policy hidden have the problem of low access policy matching efficiency. Therefore. a CP-ABE scheme was proposed that supported access policy hidden and had high eff... https://halohealthcarers.shop/product-category/physical-therapy-equipment/