> Can we have a hash function that is theoretically secure, rather than just [...] and nobody yet knows how > For example, encrypting the data with a public ke

> Can we have a hash function that is theoretically secure, rather than just [...] and nobody yet knows how > For example, encrypting the data with a public key where nobody knows the private key ought to do the job Errr... public key cryptography is only "theoretically secure" because we assume "nobody yet knows how..." to solve some hard problems like prime factoring, discrete log, etc.