The article presents a method for determining rational boundaries during the transition to underground mining of upland deposits, by performing calculations, comparing overburden coefficients and rock mass.

This method is the simplest for determining V_гм – volume of rock mass, m³, Д_р.м - volume of mined ore mass in the pit contour, t, М_э - operational metals in the pit contour, kg, V_вск – volume of overburden rocks, m³, K_вск - coefficient of overburden rocks, K_г.м - coefficient of rock mass at different depths of the open pit with the use of graphoanalytic method by using the AutoCAD computer program.

There square measure a few viewpoints to security and a few applications, move from secure trade and installments to non-public interchanges and safeguarding passwords. One fundamental feature for secure interchanges is that of mystery key cryptanalysis, that the focal point of this paper. With secret key cryptanalysis, a solitary key is utilized for each coding and mystery composing. The critical decision system and thusly the coding strategy explicit the effectiveness of the code text produced. During this paper, a substitution strategy of coding method abuse the numerical administrators over Unicode character set works with better coding algorithmic rule.