security - need to develop utility independent of technology used for website development -

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i need utility given customer having site name a.com can decry-pt messages passed own site (i.e. b.com), build in java technology.

utility should independent of technologies used customer web site development.

question: technology should used developing such utility ?

note: have read javascript not cryptography.

the best option use existing, tried-and-tested protocol. tls choice securing communication between 2 parties.

if, reason, cannot use existing protocol, you'll have design own, , describe in such detail others can implement on platforms. far ideal several reasons. designing cryptographic protocols hard, , experts regularly wrong. implementing cryptographic protocols hard too, , experts wrong. there no way non-cryptographer design or implement secure protocol.


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