The smallest integer that is larger than or equal to X. The ceiling of X.
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                                                                    NIST SP 800-108
                                                                
                                                                                                                                                                                                
									                            
						                            
						                            
						                        
					                            
						                              Byte string to be converted to or from an integer; the output of conversion from an ASCII string.
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                                                                    NIST SP 800-56B Rev. 2