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What is a ciphering key?

A cipher is defined for cryptography as "A cryptographic system using an algorithm that converts letters or sequences of bits into ciphertext." Now it seems that the origin of the term ...
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Key distribution protocol involves only 2 parties, given E[k1,E(k2,m)]=E[k2, E(k1, m)]

Is there any key distribution protocol that involves only two parties (Alice and Bob) without the key distribution center? Yes, it's Shamir's Three Pass Protocol; it works exactly how you describe. ...
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Proving you're from the year 2069

This can be done using the RFC 3161 standard, for example. There are similarities with your idea, using a PKI and digital signatures. The keyword is Trusted Timestamping and it requires a trusted ...
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