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The decryption error "RSAdecrypt wrong input (err -27)" in iOS indicates that the input data used for decryption is incorrect or corrupted. This error can occur during decryption of data encrypted using RSA encryption algorithm. It could be due to various reasons such as incorrect encryption key, mismatched key pairs or an issue in the encryption/decryption process. To resolve this error, you may need to ensure that the correct key is used for decryption, and the data is not corrupted.