Remove broken URL

r-lib · Oct 3, 2024 · 369e318 · 369e318
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commit 369e318
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/vignettes/crypto101.rmd b/vignettes/crypto101.rmd
@@ -109,7 +109,7 @@ sha256_ctr(50, key, nonce)
 
 
 
-In practice, you should never write your own ciphers. A lot of [research](https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.58.1811&rep=rep1&type=pdf) goes into studying the properties of block ciphers under various modes of operation. In the remainder we just use the standard Sodium ciphers: [`chacha20`](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/chacha20), [`salsa20`](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/salsa20) or  [`xsalsa20`](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/xsalsa20).
+In practice, you should never write your own ciphers. In the remainder we just use the standard Sodium ciphers: [`chacha20`](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/chacha20), [`salsa20`](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/salsa20) or  [`xsalsa20`](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/xsalsa20).
 
 ### Symmetric encryption