question: public static boolean slowStringComparison ( String givenSignature , String computedSignature ) { if ( null == givenSignature || null == computedSignature || givenSignature . length ( ) != computedSignature . length ( ) ) return false ; int n = computedSignature . length ( ) ; boolean signaturesMatch = true ; for ( int i = 0 ; i < n ; i ++ ) { signaturesMatch &= ( computedSignature . charAt ( i ) == givenSignature . charAt ( i ) ) ; } return signaturesMatch ; }
target:  This method is low performance string comparison function. The purpose of this method is to prevent timing attack.