A method in a pattern encryption protection scheme may efficiently decrypt data blocks in a timely manner. In the method, a processor may receive a frame of data blocks. The frame may include a plurality of pattern-encrypted subsamples, and each pattern-encrypted subsample may include one or more encrypted data blocks and one or more unencrypted data blocks in accordance with a predetermined pattern. The processor may determine a first buffer portion and a second buffer portion based on a number of the data blocks in the frame and the predetermined pattern. The processor may sort the data blocks by copying the encrypted data blocks into the first buffer portion and by copying the unencrypted data blocks into the second data buffer portion. The processor may perform a decryption call to a crypto engine to generate corresponding decrypted data blocks using the sorted encrypted data blocks in the first buffer portion.