| 摘要 |
One provides (101) message content (Figure 2) comprising at least a first message content part and a second message content part (Figure 3). One then selects (103) (at least) a first and second form of message alteration wherein each form of message alteration has corresponding recovery content (e.g. an alteration method identifier) (Figure 4) that can be used to facilitate recovering message content that has been altered using the respective form of message alteration. The first message content part, in combination with recovery content (alteration method identifier) as corresponds to the second form of message alteration (Figure 5), is then converted (104) into a first altered form using the first form of message alteration (Figure 6). In addition, one also preferably converts (105) the second message content part into a second altered form using the second form of message alteration (Figure 7). The first and second altered forms, in addition to recovery content (alteration method identifier) as corresponds to the first form of message alteration, are then transmitted (106) as a joint message (Figure 8). This provides security of the message content against a potential listener/eavesdropper or potential spoofing of the message content. Many different forms of message alteration are embodied including: data rate, spreading code, hopping pattern, spread spectrum channel, carrier modulation, carrier frequency, message format, message order, inversion pattern, symbol, encryption mode or encryption key. |
