python4finance-challenge | United States America (US)

Create: 2024-11-27 Update: 2025-06-30 06:19:55

چالش شماره 31- چالش رمزنگاری
رمز نگاری یکی از جذاب ترین کارهای علاقه مندان به امنیت است. یکی از ساده ترین نوع رمز نگاری، رمزنگاری بر اساس انتقال حروف است. این رمز یک نوع رمز جانشینی است که در آن هر حرف در متن آشکار با حرف دیگری با فاصله‌ای ثابت در الفبا جایگزین می‌شود؛ به این فاصلهٔ ثابت «مقدار انتقال» گفته می‌شود.

برای مثال اگر مقدار انتقال برابر ۳ انتخاب شود و رمزنگاری روی متن با الفبای انگلیسی انجام شود، حرف D به جای حرف A می‌نشیند، حرف E به جای حرف B می‌نشیند، تا آخر.
برنامه ای بنویسید که مقدار انتقال را دریافت کند و یک عبارت انگلیسی را به صورت رمز درآورده و بار دیگر رمز را باز کرده و مقدار اصلی عبارت را نشان دهد.

راهنمایی: این رمزنگاری به رمز نگاری سزار یا Caesar cipher معروف است.

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Should I buy bitcoin?

“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.

چالش شماره 31- چالش رمزنگاری

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Many modern travelers appear to struggle with managing various aspects of their finances simultaneously while abroad, such as banking, budgeting, investing, trading, and saving. It is important to have apps installed on the device that will help you carry out these necessary tasks.

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