IDS: ids detect malicious encrypted data?

[Lau Ker Chea <kerchea79 () yahoo com>]

        i just start doing some research in ids field. may i
know whether majority of the today's nids can detect
malicious encypted data since from the article that i
had read, early nids still face this problem. 

all opinion will be appreciated by me
sincerely..thanks!

chea 

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