What is the information concept and how can it be measured,…?

According to the Wikipedia,

""Information of an entity is that which resolves the uncertainty of its properties""

source: Wikipedia, physical information

Information contained in a physical system = the number of yes/no questions you need to get answered to fully specify the system.

But there are more then one perspective about information notion, p.e.

Shannon information theory, usually called just ‘information’ theory and Kolmogorov complexity theory the ‘algorithmic information’ theory,

Both theories aim at providing a means for measuring‘information’.

Both are measures of the smallest number of bits that can be used to regenerate a string perfectly.

With the signifiant difference that the Kolmogorov complexity approach is in an algorithm context

Shannon entropy can be considered in approximation as the estimation of the Kolmogorov complexity.

The concept of Entropy is the common thread that connects physical world (mass, energy) the world of uncertainity of events or existent (Information).

The informationn concept seems to be quite complex indeed already a question can emerges about the true ""nature"" of information,... and the link made by Entropy between Energy, Mass and Information

see this post :

"Is there an equivalence between information, energy and matter?""

but come back to Shannon Entropy and its measure:

Shannon Entropy of well-encrypted stream is equal to Shannon Entropy of random noise.

...information can not be define only based on data...? but we can ask the question if in the Kolmogorov complexity context, the algorithm used can be considered as a ""knowledge"" about ""reciever""..?

Are knowledge about data and receiver are needed,....?

Change in the receiver's state would be the only way to measure how much information is contained in the message.. ? ....so subjective

how can go deeper in the problematic about the true ""nature"" of information ..?

• Consider to include links of quotes. – Qmechanic Apr 20 at 6:44
• @JohnForkosh following the link you provide from wikipedia: "In algorithmic information theory (a subfield of computer science and mathematics), the Kolmogorov complexity of an object, such as a piece of text, is the length of the shortest computer program (in a predetermined programming language)"... it seems we know something about the ""predetermined programming language use by the reciever... – alamata Apr 20 at 7:34
• @JohnForkosh..indeed i m really interressed by the notion of information..Thx for the link provided about Kolmogorov Complexity....But there are more then one perspective about information notion, per example, the ‘information’ theory and the ‘algorithmic information’ theory, both theories aim at providing a means for measuring‘information’..... – alamata Apr 20 at 18:38