spec: fix paragraph regarding SUPI
The SUPI often is not larger than the IMSI, but the SUCI is.
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@ -32,10 +32,12 @@ reportedly used them to track anybody with a mobile phone.
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which uses public-key cryptography to ensure that the permanent subscriber
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identity (IMSI) is not transmitted over the air interface anymore.
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Rather, a concealed version of it is transmitted (3GPP TS 33.501,
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Section 6.12.2). The 5G SUCI mechanism can not be used 1:1 for previous
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generations of cellular networks as it relies on extending the
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subscriber identity from the small, 15-decimal-digit IMSI to a much
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larger SUPI (Subscriber Permanent Identifier) only available in 5G.
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Section 6.12.2). The 5G SUCI mechanism can not be adapted easily for previous
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generations of cellular networks as it relies on introducing an entirely
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new mobile identity type of larger size (SUCI) than any of the existing
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ones (e.g. IMSI), causing significant implications on protocol stacks
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and implementations all across the protocol stack of all network elements,
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including the ME.
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No mechanism for increasing subscriber identity and location privacy on
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the radio interface has been specified for the previous cellular
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