Encryption evolution in Microsoft Office

In the conclusion of my article ‘On cryptosystems untrustworthiness’, written in 1998, I specified that the using the strong cryptography in application is gradually changing for the better. Lets consider evolution of cryptographic capabilities used by the one of the most popular applications for personal computers – MS Office, šespecially because recently Microsoft has officially opened specifications of this software, including encryption algorithms used. Here below I will speak only about passwords for file opening, because when using any other passwords (read-only access etc.) the text of the document is not encrypted and that is why they can be easily bypassed. Read more »

In the beginning there was the word

… and the word was 4 bits, because the first microprocessor Intel 4004, produced in 1971, was 4-bit. We will repeatedly return to the processors, its characteristics and evolution in this blog, but let me introduce myself.

My name is Pavel Semjanov and more than 15 years I practice the computer security and work at St. Petersburg Technical University. šThe cryptography, particularly its practical application in various computer systems, became one of my hobbies from the very beginning. Another my hobby closely connected with work became the software developing for analysis of cryptographic system vulnerability and mainly password cracking (or in other words, password recovery).

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