A string of x zero bits. For example, 05 = 00000.
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                                                                    NIST SP 800-106
                                                                
                                                                                                                                                                                                
									                            
						                            
						                            
						                        
					                            
						                              The prefix to a bit string that is represented in hexadecimal characters.
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                                                                    NIST SP 800-38C
                                                                
                                                                                                                                                                                                
									                            
						                            
						                            
						                        
					                            
						                              The marker for the beginning of a hexadecimal representation of a bit string.
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                                                                    NIST SP 800-38F
                                                                
                                                                                                                                                                                                
									                            
						                            
						                            
						                        
					                            
						                              A string of x zero bits.
						                            Source(s):
						                            
								                            
                                                                
                                                                    NIST SP 800-90A Rev. 1