* @param {string} num 非负整数的字符串形式（可能含前导零）
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return new TextEncoder().encode(str.toUpperCase());
encrypting documents and other files
In 2011, hackers successfully cracked the main Linux development site, kernel.org. Afterward, to make sure this didn't happen again, the kernel's PGP web of trust was explicitly "bootstrapped" at a face-to-face key‑signing session during the 2011 Kernel Summit.